MEMORANDUM OPINION

STARK, U.S. District Judge:

Plaintiff Biogen International GmbH ("Biogen") alleges that Defendant Banner Life Sciences LLC ("Banner") infringes Biogen's U.S. Patent No. 7,619,001 ("the '001 Patent"), which is subject to a patent term extension. (D.I. 1) Banner has moved under Rule 12(c) for judgment on the pleadings on the basis of non-infringement, reasoning that the '001 Patent's extension does not reach Banner's tentatively-approved generic product. (D.I. 9) Having considered the parties' briefing (D.I. 10, 15, 20) and related materials, and having heard oral argument on August 28, 2019 (D.I. 42) ("Tr."), the Court will grant the motion.

I. BACKGROUND

A. Factual Background

The '001 Patent claims a method of treating multiple sclerosis ("MS") with pharmaceutical preparations of dimethyl fumarate ("DMF") and/or methyl hydrogen fumarate ("MMF"). ('001 Patent, cls. 1-24; D.I. 1 ¶¶ 19-26) Specifically, the relevant claims provide:

('001 Patent, cls. 1, 5)

Of the compounds listed in the '001 Patent's claims, the "active moiety" — that is, in simple terms, the compound responsible for the physiological or pharmacological action of the drug substance in the human body1 — is MMF. DMF metabolizes into the active moiety, MMF, when it is administered in the human body. (See, e.g., D.I. 16-1 Ex. 14 at 8, 11-12, 21; Ex. 15 at 8; Ex. 16 at 5; Exs. 17-19; Tr. at 6, 39, 48-49, 60-61)

DMF is an ester of MMF. (See D.I. 10 at 5-6; D.I. 15 at 5) As the Federal Circuit has explained, an "ester" is "a compound derived from an acid by the exchange of a replaceable hydrogen of the latter for an organic radical, usually using an alcohol or other organic compound rich in OH groups." Glaxo Operations UK Ltd. v. Quigg, 894 F.2d 392, 393 n.2 (Fed. Cir. 1990).

MMF, however, is not an ester of DMF. (See D.I. 8 at ¶¶ 30-31; D.I. 10 at 6; Tr. at 11, 34) Nor is MMF a salt of DMF. (See id.) As the Federal Circuit has explained, a salt is "a compound formed when the hydrogen of an acid is replaced by a metal or its equivalent." Glaxo, 894 F.2d at 393 n.3.

B. Biogen's Tecfidera Product

In March 2013, Biogen received approval from the U.S. Food and Drug Administration ("FDA") to market Tecfidera (dimethyl fumarate "DMF") delayed-release capsules for the treatment of MS. (D.I. 1 at ¶¶ 25-26) The mechanism by which DMF accomplishes its therapeutic effect in MS is unknown. (D.I. 6 at ¶ 25) As Biogen explains: "Tecfidera contains DMF, but DMF rapidly cleaves an ester to become MMF following administration." (D.I. 15 at 5) Thus, just prior to oral administration, Tecfidera DMF capsules do not contain MMF; but, following oral administration, the DMF in Tecfidera capsules converts in the human body into the active moiety, MMF. (See D.I. 8 at ¶ 14-15) (Biogen stating that '001 Patent and Tecfidera package insert explain that MMF is a metabolite of DMF)

Biogen, as part of its New Drug Application ("NDA"), submitted to the FDA extensive data on both DMF and MMF. (See, e.g., D.I. 16-1 Ex. 14 at 8, 11-12, 21; Ex. 15 at 8; Ex. 16 at 5; Exs. 17-19; Tr. at 6, 39, 48-49, 60-61)

C. Biogen's Patent Term Extension

The Hatch-Waxman Act, and in particular 35 U.S.C. § 156, "provides the holders of patents on approved patented products with an extended term of protection under the patent to compensate for the delay in obtaining FDA approval." Merck & Co., Inc. v. Kessler, 80 F.3d 1543, 1547 (Fed. Cir. 1996); see also id. at 1552 ("The statute contemplates a patentee receiving time lost in its patent term by reason of FDA delay, and the statute should be liberally interpreted to achieve this end."). "[T]he restoration period of the patent does not extend to all products protected by the patent but only to the product on which the extension was based." Id.

With its '001 Patent originally set to expire on April 1, 2018, Biogen sought and received a patent term extension ("PTE") of 811 days under 35 U.S.C. § 156 due to delay that had occurred in obtaining FDA approval to market Tecfidera. (See D.I. 15 at 5) As a result, the parties agree that the '001 Patent is now set to expire on June 20, 2020. (D.I. 1 at ¶ 22)

D. Banner's Bafiertam Product

On January 18, 2018, prior to the expiration of the '001 Patent's extended term, Banner submitted NDA No. 210296 under § 505(b)(2), see 21 U.S.C. § 355(b)(2), seeking approval to manufacture, use, import, offer to sell, and sell Bafiertam (monomethyl fumarate "MMF") delayed-release capsules for the treatment of MS. (D.I. 1 at ¶ 5; see also D.I. 6-1 at 1; D.I. 6-9 at 13) As part of its drug application, Banner demonstrated the safety and efficacy of Bafiertam by relying on Biogen's MMF data. (D.I. 1 at ¶ 28; D.I. 6 at 25 ¶ 32; Tr. at 39) On November 19, 2018, Banner sent a Paragraph IV notice letter to Biogen, see 21 U.S.C. § 355(b)(2)(A)(iv), certifying that the '001 Patent was invalid, unenforceable, and/or will not be infringed by Banner's product. (See e.g., D.I. 1 at ¶ 28; D.I. 6 at ¶ 7) Banner received tentative approval from the FDA on November 16, 2018. (See D.I. 6 at 2-3; D.I. 6-1)

E. Procedural Background

Biogen sued Banner for infringement of the '001 Patent on December 27, 2018.2 (D.I. 1) By filing such suit within 45 days of receiving notification of Banner's filing of its NDA, Biogen obtained an automatic 30-month stay of FDA approval of Banner's Bafiertam product. See 35 U.S.C. § 355(j)(5)(B)(iii). Thus, at this time, the only impediment to Banner obtaining final FDA approval and having the right to market Bafiertam is the pendency of this litigation. (See D.I. 10 at 7)

II. LEGAL STANDARDS

Under Federal Rule of Civil Procedure 12(c), a party may move for judgment on the pleadings "[a]fter the pleadings are closed — but early enough not to delay trial." When evaluating such a motion, the Court must accept all factual allegations in a complaint as true and view the pleadings in the light most favorable to the non-moving party. See Rosenau v. Unifund Corp., 539 F.3d 218, 221 (3d Cir. 2008). A Rule 12(c) motion will not be granted "unless the movant clearly establishes that no material issue of fact remains to be resolved and that he is entitled to judgment as a matter of law." Id. (internal citation omitted).

The Court may consider matters of public record as well as authentic documents upon which the complaint is based, if attached to the complaint or as an exhibit to the motion. See Oshiver v. Levin, Fishbein, Sedran & Berman, 38 F.3d 1380, 1384 n.2 (3d Cir. 1994); see also In re Burlington Coat Factory Sec. Litig., 114 F.3d 1410, 1426 (3d Cir. 1997) (explaining that documents integral to pleadings may be considered in connection with Rule 12(c) motion).

III. DISCUSSION

In this litigation, and for purposes of its Rule 12(c) motion for judgment on the pleadings, Banner does not contest that its product, Bafiertam, literally infringes at least claim 1 of Biogen's '001 Patent, as Bafiertam contains MMF and is intended to be used as a method of treatment for MS. (See, e.g., D.I. 10 at 1) Instead, Banner's contention is that the portion of the '001 Patent that Bafiertam practices expired in April 2018. In Banner's view, Biogen's PTE applies only to the claimed embodiment which constitutes Biogen's FDA-approved DMF product, Tecfidera; that is, the '001 Patent was only extended, and can only be enforced, with respect to a DMF-containing product. (See id. at 15-17) Because Banner's Bafiertam contains MMF and not DMF, Banner argues it is entitled to judgment on the pleadings of no infringement.

For the reasons described below, the Court agrees with Banner.

A. PTE Statutory Framework

Applications for, and limitations on enforcement of, patent term extensions are governed by 35 U.S.C. § 156.

The first provision relevant here is § 156(a), which provides, in pertinent part:

(Emphasis added)

The next relevant provision is § 156(b), which imposes a limitation on rights obtained by a PTE. In pertinent part, § 156(b) provides:

(Emphasis and internal bracketed numbering added)

Finally, § 156(f) defines several terms used throughout § 156, including pertinent terms in §§ 156(a) and (b). In particular, § 156(f) provides:

(Emphasis added)

B. Biogen's PTE May Only Be Enforced Against A DMF-Containing Product

The parties are in agreement that Biogen successfully obtained a PTE on its '001 Patent until June 20, 2020 based on its FDA-approved product, Tecfidera, because Tecfidera was subject to a regulatory review period before its commercial marketing began and Tecfidera is the first commercially-marketed product which is an embodiment of the '001 Patent. (See D.I. 1 at ¶ 22; D.I. 6 at ¶ 22; see also D.I. 10 at 7-8; D.I. 15 at 5) The parties disagree, however, on the scope of that extension and, particularly, whether it extends to Banner's MMF product.

1. The PTE Applies to the Entire '001 Patent

As an initial matter, § 156(a) provides that "the term of a patent which claims a product [or] a method of using a product... shall be extended" (emphasis added). Considering this provision, the Federal Circuit in Genetics Institute v. Novartis Vaccines and Diagnostics rejected the argument that a PTE applies on "a claim-by-claim basis." 655 F.3d 1291, 1300 (Fed. Cir. 2011). The term of the entire patent for which a PTE has been obtained is extended.

This does not mean, however, that Biogen, for example, has the right to enforce the entirety of the '001 Patent. Rather, § 156(b) limits the effect of the extension to the "rights derived" under § 156(a). See Genetics Inst., 655 F.3d at 1301; see also generally 35 U.S.C. § 156(d)(1)(B) (requiring patent owner to identify each claim "which claims the approved product or a method of using or manufacturing the approved product").

The result here is that, even though the entirety of the '001 Patent term has been extended under § 156(a), the Court must still assess whether Biogen's "rights derived" in the '001 Patent's extended term are enforceable under § 156(b). Specifically, the Court must determine whether the method of using Banner's MMF-product for the treatment of MS comes within the scope of the enforceable "rights derived" by Biogen from the extension of the '001 Patent's term.

2. Biogen's Enforceable Patent Rights are Governed by Subsection 156(b)(2)

The parties agree that claim 1 of the '001 Patent claims a method of use. (See D.I. 10 at 15; D.I. 15 at 8) Therefore, Biogen's enforceable patent rights during the '001 Patent's extended term are governed by § 156(b)(2). Subsection 156(b)(2) limits the "rights derived" from a PTE "to any use [i] claimed by the patent and [ii] approved for the product." The parties offer different interpretations of this statute.

Banner argues that § 156(b)(2) limits the effectiveness of the PTE to "any use claimed by the patent and approved for the [approved] product." (D.I. 10 at 12-15) Under this reasoning, the '001 Patent rights that Biogen may enforce during the extension period are limited to a method of treating MS using DMF (not MMF). (Id.) Banner focuses on the fact that treatment of MS with DMF (including with any salts or esters of DMF) is the use claimed in the '001 Patent and is also the use for which the FDA has approved Biogen's DMF-containing Tecfidera. (Id.) Banner's interpretation of the statutory scheme recognizes that Biogen's rights extend to salts and esters of DMF because § 156(f) expressly defines "product" to mean "the active ingredient of ... a new drug ... including any salt or ester of the active ingredient."

Biogen has a broader understanding of the rights it may enforce during the extension period of the '001 Patent. (See D.I. 15 at 9-10) Biogen reads § 156(b)(2) as not just limited to the specific FDA-approved product/use combination (in this case, Tecfidera (DMF) for MS), but as also reaching any claim (or any portion of any claim) in the '001 Patent directed to methods of treating MS. (D.I. 15 at 10) Thus, under Biogen's interpretation, the PTE applies to any drug product disclosed in the claimed methods of the '001 Patent that can be used to treat MS, which in this case, would include the use of DMF, MMF, or any salts or esters thereof.

Having carefully considered the parties' positions, the Court agrees with Banner's view as to the meaning of § 156(b)(2) and how it applies to the undisputed facts of this case. The Court's conclusion is supported by both the statutory language and Federal Circuit caselaw, to which the Court now turns.

a. Analogy to identical language of § 156(b)(1)

In the context of § 156(b)(1), which applies to extensions "of a patent which claims a product" — as opposed to "a patent which claims a method of using a product", which is governed by § 156(b)(2) — the Federal Circuit has held that "the restoration period ... does not extend to all products protected by the patent but only to the product on which the extension was based." Merck & Co., Inc. v. Kessler, 80 F.3d 1543, 1547 (Fed. Cir. 1996) (emphasis added); see also MPEP § 2750 (9th ed. Rev. 8.2017) ("[P]ursuant to 35 U.S.C. 156(b), if the patent claims other products in addition to the approved product, the exclusive patent rights to the additional products expire with the original expiration date of the patent."). In other words, the "rights derived" from the PTE do not extend to all embodiments within the scope of the claims that have been extended. Instead, those rights extend only to the claimed embodiment on which the extension is based, i.e., the FDA-approved drug product (provided that product is also an embodiment of the claims).

The Court has concluded that the same, governing, Federal Circuit interpretation of § 156(b)(1) applies equally to § 156(b)(2). The pertinent statutory language is identical: subsection 156(b)(1) imposes limits "limited to any use approved for the product," while subsection 156(b)(2) imposes limits "limited to any use claimed by the patent and approved for the product" (emphasis added). The identical words are used in the identical manner in both provisions.4 "The normal rule of statutory construction [is] that identical words used in different parts of the same Act are intended to have the same meaning." Gustafson v. Alloyd Co., Inc., 513 U.S. 561, 562, 115 S.Ct. 1061, 131 L.Ed.2d 1 (1995); see also MPEP § 2750 (applying same interpretation to all of § 156(b)). Biogen has pointed to no persuasive reason for why the Federal Circuit's analysis of § 156(b)(1) does not apply equally to § 156(b)(2).

Accordingly, the Court holds that the rights derived by a PTE on a method of use patent "does not extend to all products protected by the patent but only to the product on which the extension was based." Merck, 80 F.3d at 1547.

b. Biogen's approved product is DMF, not MMF

Having determined the proper scope of § 156(b)(2), the question then becomes: what is the FDA-approved product in this case? As already noted, § 156(f)(2) defines "product" as "[a] drug product," and further defines "drug product" as "the active ingredient of ... a new drug ... including any salt or ester of the active ingredient." Therefore, the pertinent question here is: what is the "active ingredient" of Biogen's approved drug product, Tecfidera?

On this point, the parties again disagree.

Banner argues that the "active ingredient" is the molecule found in the administered drug product before it is administered to the patient. (See D.I. 10 at 15-17) Therefore, to Banner, the "active ingredient" of Tecfidera is DMF (as well as the salts and esters of DMF). (See id.) Biogen, however, contends that Tecfidera's active ingredient is the active moiety, which here is MMF (as well as salts and esters of MMF). (D.I. 15 at 11-12)

Both parties put forth reasonable interpretations of the statutory framework in light of two precedential Federal Circuit cases. Banner relies on Judge Michel's opinion in Glaxo Operations UK Ltd. v. Quigg, 894 F.2d 392 (Fed. Cir. 1990), while Biogen relies on Judge Newman's opinion in Pfizer v. Dr. Reddy's Laboratories, 359 F.3d 1361 (Fed. Cir. 2004). As discussed below, although these cases may appear to be in conflict, the Federal Circuit held in a subsequent opinion, PhotoCure v. Kappos, 603 F.3d 1372, 1375 (Fed. Cir. 2010), that no conflicts exists.

i. Glaxo — Plain Meaning

Banner's position is supported by Glaxo, 894 F.2d at 392, in which the Federal Circuit, interpreting § 156(f)(2) for the first time, focused on the plain meaning of the statutory language and determine that "active ingredient" refers to the molecule in the drug product to be administered, not the active moiety.

Glaxo owned two patents: (1) the '153 Patent, which claimed cefuroxime and its salts; and (2) the '320 Patent, which claimed cefuroxime axetil, an ester of cefuroxime. Id. at 393. The FDA first approved for use two cefuroxime salts, Zinacef and Kefurox, and only later approved a cefuroxime axetil, Ceftin. See id. at 393-94. Glaxo applied for a PTE for the '320 Patent, which the United States Patent and Trademark Office ("PTO") denied, since Ceftin — an embodiment of the '320 Patent — was not "the first permitted commercial marketing or use" of the "product," given the previous approved commercial use of Zinacef and Kefurox. Id. In denying Glaxo's requested PTE, the PTO interpreted "active ingredient" in § 156(f)(2) to mean "new active moiety," "which would encompass all acid, salt, or ester forms of a single therapeutically active substance." Id. at 397. Because the active moiety for cefuroxime, cefuroxime salts, and cefuroxime axetil was the same, see id. at 394 ("after being orally administered CEFTIN tablets combine with digestive substances in the human body to produce the same therapuetically active substance contained in both ZINACEF and KEFUROX"), the first relevant approved product was the first product containing any of these, which happened to be cefuroxime salts, in the form of Zinacef and Kefurox.

Glaxo challenged the PTO's decision in the district court and, on appeal, the Federal Circuit rejected the PTO's "active moiety" interpretation. Instead, the Federal Circuit — which considered § 156(f)(2) to be "unambiguous on its face" and to provide "an explicit and precise definition of `product' ... using well-established scientific terms," id. at 399 — held that "active ingredient" refers to the active ingredient of the administered drug product, see id. at 394-95, 399-400. The approved drug product which was the basis for Glaxo's requested extension of the '320 Patent was Ceftin, which at administration contained cefuroxime axetil. See id. At administration (that is, when being placed in the human body), Ceftin did not contain either cefuroxime or cefuroxime salts. See id. at 392. Since Zinacef and Kefurox were neither salts nor esters of cefuroxime axetil, and therefore did not constitute the same "drug product" as cefuroxime axetil, those products could not be used to deny Glaxo a PTE for the '320 Patent. See id. at 399-400. Therefore, the prior approval of Zinacef and Kefurox — products containing cefuroxime salts — was not a prior approval of a product containing cefuroxime axetil, and a PTE on the '320 Patent should have been granted.

Notably, in Glaxo, the Federal Circuit rejected the PTO's position that Ceftin, Zinacef, and Kefurox all constituted the same drug product because they all metabolized into the same "therapeutically active substance." Id. The Federal Circuit rejected the PTO's interpretation of subsection 156(f)(2)'s "active ingredient" as meaning "new active moiety."

Glaxo supports Banner. Glaxo instructs that the Court apply § 156(f)(2)'s plain and ordinary meaning and look just to the active ingredient found in the FDA-approved product (on which the PTE is based) when administered; that is, as the product exists before it is taken by a human patient. See also Hoechst-Roussel Pharmaceuticals, Inc. v. Lehman, 109 F.3d 756, 759 n.3 (Fed. Cir. 1997) ("For purposes of patent term extension, this active ingredient must be present in the drug product when administered.") (citing Glaxo, 894 F.2d at 392).5 Glaxo teaches not to look at the active moiety of the FDA-approved product at the time that moiety is delivering its therapeutic effect in the body.6

Therefore, if the Court follows Glaxo, Banner would prevail. Biogen's enforceable, extended patent term would extend only to DMF (and its salts and esters), which is the "active ingredient" in the FDA-approved drug (Tecfidera) when administered, and would not extend to DMF's active moiety (which is MMF). Since Banner's Bafiertam product only contains MMF (which is undisputedly not a salt or ester of DMF), Banner could not be found to infringe the extended, enforceable rights Biogen maintains in its '001 Patent.

ii. Pfizer — Active Moiety

The above does not end the analysis, however, because Biogen's position also finds support in Federal Circuit precedent. In Pfizer v. Dr. Reddy's Laboratories, 359 F.3d 1361, 1364 (Fed. Cir. 2004), Pfizer, had received a PTE for its FDA-approved drug Norvasc, an amlodipine besylate. During the term extension, Dr. Reddy's sought approval for a product containing amlodipine maleate, which was covered by Pfizer's patent. See id. Amlodipine maleate is neither a salt nor ester of amlodipine besylate. See id. at 1363-65. Therefore, Dr. Reddy's argued, its product could not be found to infringe during the extension, since amlodipine maleate fell outside the scope of Pfizer's enforceable, extended patent rights. See id.

Dr. Reddy's argument is precisely the argument Banner makes here: Biogen received a PTE for its FDA-approved drug Tecfidera, which contains DMF; since Banner's product contains only MMF, which is neither a salt nor ester of DMF, Banner's product falls outside the scope of Biogen's enforceable, extended patent rights. Based on Glaxo, then, one might have expected Dr. Reddy's to prevail. Instead, however, the Federal Circuit rejected Dr. Reddy's position and ruled for Pfizer.7

Specifically, the Federal Circuit held in Pfizer that the "active ingredient" for purposes of the PTE was "amlodipine," i.e., the active moiety, regardless of "whether [it was] administered as a besylate salt [amlodipine besylate] or the maleate salt [amlodipine maleate]." Id. at 1366. The Court explained that § 156 "was not intended to be defeated by simply changing the salt." Id. Hence, "Dr. Reddy's attempt to limit the extension to the specific approved salt on the basis of the `rights derived' provision of § 156(b) to the approved product [was] unsound." Id.; see also id. (stating that § 156(b)(1) "does not contain any limitation regarding the form of the product subject to the extension"). The Federal Circuit further observed that the FDA defines "active ingredient ... including any salt or ester of the active ingredient" — which is the same language as found in § 156(f)(2) — as "active moiety." See id. (citing 59 Fed. Reg. 50338, 50358 (F.D.A. Oct. 3, 1994)).

Applying the reasoning of Pfizer would suggest that identifying the "active ingredient" that is the basis for Biogen's enforceable, extended patent rights requires looking to the active moiety of Biogen's approved product, Tecfidera, which is MMF.8 A holding that Biogen's enforceable PTE rights extend to MMF (as well as any salts and esters of MMF, including DMF), would mean that Banner's Bafiertam, which contains MMF, infringes.

iii. PhotoCure v. Kappos — Addressing the Potential Conflict

Arguably, then, there appears to be a conflict between Glaxo's and Pfizer's interpretations of § 156: Glaxo views the "active ingredient" of the approved product as limited to only the active ingredient in the product when administered (and salts and esters thereof), while Pfizer views the "active ingredient" more broadly as also including the "active moiety" (and salts and esters thereof) doing the therapeutic work in the body of a human patient. See PhotoCure ASA v. Dudas, 622 F.Supp.2d 338, 347 (E.D. Va. 2009) (discussing apparent conflict), aff'd sub nom. PhotoCure ASA v. Kappos, 603 F.3d 1372, 1375 (Fed. Cir. 2010).

However, the Federal Circuit has itself expressly held that there is no conflict. In PhotoCure ASA v. Kappos, 603 F.3d at 1375, the Federal Circuit stated that its Glaxo and Pfizer decisions "are not in conflict," as "Pfizer did not concern the Glaxo ruling that the active ingredient is the ingredient in the drug product as administered." The Federal Circuit quoted Glaxo and reaffirmed that "a compound can only qualify as the `active ingredient' of a drug if that compound itself is present in the drug." Id. at 1375-76. Further, PhotoCure emphatically states: "Pfizer did not change the law of § 156." Id. at 1376. Rather, the Federal Circuit explained that "[t]he issue in Pfizer was whether infringement of an extended patent ... was avoided by changing the salt," and Pfizer's holding was that one cannot avoid infringement of an extended patent term simply by changing the salt of the active moiety. Id. at 1376. Moreover, "Pfizer did not hold that extension is not available when an existing product is substantively changed in a way that produces a new and separately patentable product having improved properties and requiring full FDA approval." Id.

In PhotoCure, then, the Federal Circuit allowed a PTE for a patent covering MAL hydrochloride notwithstanding that a previously-approved product contained ALA hydrochloride, even though MAL hydrochloride and ALA hydrochloride shared the same active moiety. See 603 F.3d at 1375. The Federal Circuit based its decision in PhotoCure, at least in part, on the fact that MAL hydrochloride was, by FDA standards, a "new drug" requiring a full (not abbreviated) approval process. See id. By contrast, according to PhotoCure, "Pfizer did not concern a different, separately patented product requiring full regulatory approval." Id. at 1376.

iv. Biogen's Active Ingredient Is DMF

Given the Federal Circuit's instruction that there is no direct conflict between Glaxo and Pfizer, the Court must, consistent with Glaxo and the unambiguous meaning of § 156(f)(2), look for the "active ingredient" of Biogen's FDA-approved product in that product at the time of administration, before the product is taken by a human patient. See Glaxo, 894 F.2d at 392-95. Here, the FDA-approved product that is the basis for the '001 Patent's PTE is Biogen's Tecfidera. It is undisputed that the "active ingredient" in Tecfidera when administered (i.e., before it is ingested by a human patient) is DMF. Therefore, Biogen's enforceable, extended patent rights extend only to DMF.

This holding does not conflict with Pfizer because, as PhotoCure holds, see 603 F.3d at 1376, Pfizer does not affect Glaxo's ruling that one looks for the active ingredient in the product when administered — which is what the Court is doing here.9 Also, Pfizer emphasizes that § 156(f)(2) does not allow one to avoid infringement of an extended patent simply by changing the salt of the active moiety. See 359 F.3d at 1361. The Court's holding today complies with that directive: Banner's MMF is not a salt (or ester) of DMF, so Banner is not avoiding infringement via the Hatch-Waxman "loophole" the Federal Circuit feared might arise in Pfizer. Id. at 1366 ("The Hatch-Waxman Act foresaw and averted the potential loophole of a change in the salt of the active ingredient.").

In any event, even if there were a direct conflict between Glaxo and Pfizer, the Court would be bound to follow Glaxo, as it is the earlier of what would then be two conflicting precedential opinions of different panels of the Federal Circuit. See Newell Cos., Inc. v. Kenney Mfg. Co., 864 F.2d 757, 765 (Fed. Cir. 1988) ("[P]rior decisions of a panel of the court are binding precedent on subsequent panels unless and until overturned in banc.... Where there is direct conflict, the precedential decision is the first."). Thus, even if the Court is incorrect and there actually is a conflict, the outcome here would still be the same: the Court would follow Glaxo and would grant Banner's motion.

c. Banner Cannot Be Found Liable for Literal Infringement By Its MMF Product

Reading §§ 156(b)(2) and 156(f)(2) together, then, the Court concludes that the "active ingredient" of Biogen's approved drug product, Tecfidera, is DMF, so the enforceable "rights derived" from the PTE on the '001 Patent are limited to any use claimed in the '001 Patent and approved for the approved DMF product. Biogen's enforceable rights in the '001 Patent are limited to DMF and salts and esters of DMF. While DMF is an ester of MMF, MMF is neither a salt nor ester of DMF. (See D.I. 6 at ¶¶ 30-31; D.I. 8 at ¶ 28 (admitting MMF differs from DMF by ester linkage); Tr. at 11, 34)) Therefore, by operation of §§ 156(b)(2) and 156(f)(2), Biogen has no enforceable rights during the patent extension period with respect to MMF. Any rights to MMF conveyed by the '001 Patent expired in April 2018.

Therefore, the Court Banner's motion for judgment on the pleadings of no literal infringement.

C. Doctrine of Equivalents

As an alternative theory for proving infringement, Biogen argues that at least some claim scope lost during the extended period of its PTE may be reclaimed through the doctrine of equivalents ("DOE"). (D.I. 15 at 18-19; Tr. at 52-53) Biogen's theory is essentially as follows:

(D.I. 15 at 19) (internal citations omitted)

The Court agrees with Banner that Biogen's assertion of DOE infringement does not raise factual issues and should be resolved, as a matter of law, against Biogen. As Banner persuasively argues:

(D.I. 20 at 10)10

Thus, because the Court has held that Biogen's enforceable PTE rights do not extend to MMF (and its MMF rights expired with the expiration of the original patent term), there is no meritorious basis to hold that Biogen can recapture that expired subject matter through the doctrine of equivalents. (See D.I. 20 at 9-10) The Court is persuaded by Banner's analogy to prosecution history estoppel, which prevents a patentee from using DOE to recapture claim scope it disclaimed during prosecution of its patent. See generally Pharma Tech Sols., Inc. v. LifeScan, Inc., 942 F.3d 1372, 1380 (Fed. Cir. 2019) ("Prosecution history estoppel applies as part of an infringement analysis to prevent a patentee from using the doctrine of equivalents to recapture subject matter surrendered from the literal scope of a claim during prosecution.").11

Therefore, the Court will grant Banner's motion for judgment on the pleadings of no infringement under the DOE.

IV. CONCLUSION

For the reasons stated above, the Court will grant Banner's motion for judgment on the pleadings. An appropriate order follows.