PROST, Circuit Judge.

Medtronic CoreValve, LLC, the assignee of U.S. Patent No. 7,892,281 ("`281 patent"), appeals from the judgment of the United States District Court for the Central District of California granting summary judgment to Edwards Lifesciences Corp., Edwards Lifesciences LLC, and Edwards Lifesciences (U.S.) Inc. (collectively, "Edwards") of invalidity of certain claims of the '281 patent. The judgment rests on the district court's grant of partial summary judgment that the '281 patent is limited to a priority date of no earlier than April 10, 2003. Medtronic CoreValve, LLC v. Edwards Lifesciences Corp., No. 11-CV961 (C.D.Cal. Nov. 13, 2012) (Minute Order) ("SJ Order"). For the reasons set forth below, we affirm.

BACKGROUND

Medtronic CoreValve, LLC, Medtronic CV Luxembourg S.a.r.l., and Medtronic Vascular Galway Ltd. (collectively, "Medtronic") sued Edwards for infringement of claims 3, 4, 7, 12, 14, and 15 of the '281 patent ("Asserted Claims"). The '281 patent, entitled "Prosthetic Valve for Transluminal Delivery," issued on February 22, 2011. Filed on January 5, 2009, the '281 patent descends from a number of United States, international, and French patent applications. On its face, the '281 patent claims priority to French Application No. 99/14462 ("French Application 1a"),1 filed on November 17, 1999. '281 patent, cover page, item 30 & col. 1 ll. 19-20, 37-39. However, because French Application 1a is not relevant to the claims asserted against Edwards, the pertinent priority chain2 for the Asserted Claims has its genesis in French Application No. 00/14028 ("French Application 1b"), filed on October 31, 2000. From there, the chain of priority proceeds as follows, ending with U.S. Patent Application Serial No. 12/348,892 ("U.S. Application 10"), filed on January 5, 2009, which matured into the '281 patent:

Application                                 Serial Number                          Filing date

French Application 1b            French Application No. FR 00/14028                Oct. 31, 2000

International Application 2b     International Application No. PCT/FR              Oct. 19, 2001
                                 01/03258

U.S. Application 4               U.S. Patent Application Serial No. 10/412,634     Apr. 10, 2003

U.S. Application 6               U.S. Patent Application Serial No. 11/352,614     Feb. 13, 2006

U.S. Application 8               U.S. Patent Application Serial No. 12/029,031     Feb. 11, 2008

U.S. Application 10              U.S. Patent Application Serial No. 12/348,892     Jan. 5, 2009

Over the course of litigation, Edwards became aware that the '281 patent's priority chain suffered from several defects for failure to comply with the requirements of 35 U.S.C. §§ 119 and 120. Edwards moved for partial summary judgment that these defects limited the priority date of the Asserted Claims to no earlier than April 10, 2003, the date on which U.S. Patent Application Serial No. 10/412,634 ("U.S. Application 4") was filed. Based on the April 10, 2003 priority date, Edwards also moved to invalidate the Asserted Claims on summary judgment under 35 U.S.C. § 102 with earlier filed French Application 1b and International Application (Patent Cooperation Treaty) No. PCT/FR 01/03258 ("International Application 2b").

Medtronic filed a cross-motion for summary judgment on the priority date issue, contending that the priority chain of the '281 patent suffered from no defects and that the Asserted Claims are entitled to a priority date of October 31, 2000, the filing date of French Application 1b. Medtronic did not directly oppose Edwards's invalidity motion on the merits, i.e., contest any facts regarding the scope of the alleged invalidating prior art relative to the Asserted Claims. Instead, Medtronic doubled down on its priority date position because a finding that the '281 patent is entitled to an October 31, 2000 priority date would defeat Edwards's invalidity challenge.

The district court granted Edwards's motion and denied Medtronic's cross-motion. With respect to priority, the court found that the '281 patent is not entitled to a priority date earlier than April 10, 2003 because it was neither in compliance with 35 U.S.C. § 119 to claim the benefit of the October 31, 2000 filing date of French Application 1b, nor in compliance with 35 U.S.C. § 120 to claim the benefit of the October 19, 2001 filing date of International Application 2b. SJ Order, at 4-8. The district court interpreted § 119, which governs priority claims based on an earlier filed foreign patent application, to require, inter alia, that "all intermediate applications in a priority chain contain a specific reference to the earlier-filed foreign application" from which priority is claimed. Id. at 7. In Medtronic's case, not every intervening application in the priority chain — that is, U.S. Application 4, U.S. Patent Application Serial No. 11/352,614 ("U.S. Application 6"), and U.S. Patent Application Serial No. 12/029,031 ("U.S. Application 8") — claimed priority to French Application 1b. Thus, finding the priority record of the '281 patent to be incomplete, the district court disallowed the '281 patent from securing the benefit of the filing date of French Application 1b under § 119. Id. at 6-7.

For similar reasons, the district court also found that the defects in the '281 patent's priority chain rendered it unable to claim priority to International Application 2b under § 120. Citing Encyclopaedia Britannica, Inc. v. Alpine Electronics of America, Inc., 609 F.3d 1345 (Fed.Cir. 2010), the district court noted that under § 120, a later filed application may claim priority based on an earlier filed application if, inter alia, the later filed application contains or is amended to contain a specific reference to the earlier filed application. SJ Order, at 6. To claim priority to International Application 2b, each intermediate application must recite every intervening application before it all the way back to International Application 2b. Id. at 8. Because the specifications of U.S. Applications 6 and 8 each simply state that "this application is also a continuation-in-part of [International Application 2b]," these applications have failed to recite the correct chain of priority as required by § 120. Id. In particular, Medtronic's U.S. Application 6 broke the priority chain by leaving out U.S. Application 4 in making its claim for priority to International Application 2b; likewise, U.S. Application 8 failed to link U.S. Applications 4 and 6 in its priority claim to International Application 2b. The district court thus found that the '281 patent cannot claim priority back to International Application 2b under § 120. Id.

The parties did not dispute that the '281 patent can claim priority to the patent application that was next along the priority chain, U.S. Application 4, filed on April 10, 2003, because it recited its priority claim accurately. Accordingly, the district court granted partial summary judgment in favor of Edwards and set the priority date of the '281 patent to be no earlier than April 10, 2003. Id.

With respect to invalidity, the district court noted that apart from the priority date issue, Medtronic did not rebut Edwards's evidence that the Asserted Claims of the '281 patent were anticipated by French Application 1b under 35 U.S.C. § 102(d), or that asserted claims 3, 4, and 7 were anticipated by patents that issued from French Application 1b and International Application 2b under § 102(a). Id. at 9. Upon finding the effective filing date of the '281 patent to be April 10, 2003 — well after the filing date of the § 102(d) reference and the issuance and publication date of the § 102(a) references — the district court held Medtronic's corresponding patent claims invalid as anticipated. The district court thereafter granted summary judgment of invalidity to Edwards. Id. at 9.

On November 26, 2012, the district court entered final judgment against Medtronic, and adjudged claims 3, 4, 7, 12, 14, and 15 of the '281 patent to be invalid under 35 U.S.C. § 102. Medtronic appeals. We have jurisdiction under 28 U.S.C. § 1295(a)(1).

DISCUSSION

Summary judgment is appropriate "if the movant shows that there is no genuine dispute as to any material fact and the movant is entitled to judgment as a matter of law." Fed.R.Civ.P. 56(a). We review a district court's grant or denial of summary judgment under the law of the regional circuit, here the Ninth Circuit. Teva Pharm. Indus. v. AstraZeneca Pharm. LP, 661 F.3d 1378, 1381 (Fed.Cir. 2011). The Ninth Circuit reviews summary judgment rulings without deference. Dealertrack, Inc. v. Huber, 674 F.3d 1315, 1320 (Fed.Cir.2012). Determination of a patent's priority date is purely a question of law if the facts underlying that determination are undisputed. E.I. du Pont de Nemours & Co. v. MacDermid Printing Solutions, LLC, 525 F.3d 1353, 1359 (Fed. Cir.2008). This case presents no disputed issues of fact relevant to the district court's determinations.

Medtronic's appeal asks us to determine whether the district court erred in holding that the '281 patent could not claim the benefit of an earlier priority date for failure to comply with the requirements of both 35 U.S.C. §§ 119 and 120. Medtronic recognizes, however, that it must demonstrate compliance with both §§ 119 and 120 to overcome the final judgment of invalidity because that finding rests entirely on the district court's priority date determination. Thus, the parties agree that an affirmance of the district court's determination under either § 119 or § 120 would seal the fate of the '281 patent. Oral Argument at 1:04-2:08, 46:40-47:17, Medtronic CoreValve, LLC v. Edwards Lifesciences Corp., No. 2013-1117 (Fed.Cir. Oct. 9, 2013), available at http:// oralarguments.cafc.uscourts. gov/default.aspx?fl=2013-1117.mp3. Therefore, we need to examine the district court's analysis only with respect to one of the two provisions governing priority — we choose § 120.

Section 120 allows a later filed patent application to claim the benefit of an earlier filing date in the United States if, among other requirements,3 "it contains or is amended to contain a specific reference to the earlier filed application ... submitted at such time during the pendency of the application as required by the Director." 35 U.S.C. § 120. We recently clarified that the "specific reference" requirement mandates "each [intermediate] application in the chain of priority to refer to the prior applications." Encyclopaedia Britannica, 609 F.3d at 1352.

We agree with the district court that because intermediate U.S. Applications 6 and 8 failed to specifically reference the earlier filed applications in the priority chain, the '281 patent is not entitled to claim the priority date of International Application 2b under § 120.

A complete priority chain claiming priority to International Application 2b under § 120 would have disclosed the following:

This priority chain was recited in U.S. Application 10, which matured into the '281 patent.4 See J.A. 918. Medtronic, however, failed to do as thorough a job for the priority claims in intermediate U.S. Applications 6 and 8, which merely stated, in relevant part:

J.A. 1054 (U.S. Application 8); J.A. 945 (U.S. Application 6). The priority chain disclosed in U.S. Applications 6 and 8 insufficiently and incorrectly stated that (1) U.S. Application 6 is a continuation-in-part of International Application 2b, omitting any reference to intermediate U.S. Application 4; and (2) U.S. Application 8 is a continuation-in-part of International Application 2b, omitting citations to both intermediate U.S. Applications 6 and 4. More is required.5 The district court thus correctly found that the priority claims in U.S. Applications 6 and 8 were defective under § 120 because the phrase "this application" does not expressly identify the correct patent application (i.e., U.S. Application 4) as the co-pending continuation-in-part of International Application 2b. SJ Order, at 8. Instead, it is apparent from reviewing the disclosure in U.S. Application 4 that Medtronic recycled the priority claim in that application for use in U.S. Applications 6 and 8. Compare J.A. 904 (U.S. Application 4) with J.A. 1054 (U.S. Application 8) and J.A. 945 (U.S. Application 6).

Medtronic disputes that the phrase "this application" in the priority claims of U.S. Applications 6 and 8 must mean, as the district court found, "the present application." SJ Order, at 8. Medtronic asserts that the district court incorrectly adopted a plain language reading of the phrase, even though Medtronic had intended for the phrase to refer to U.S. Application 4. Stated differently, Medtronic's argument is that the phrase "this application" is not self-referential from application to application; rather, it always refers to U.S. Application 4, whether it is being used in U.S. Application 4, 6, or 8.

Medtronic's proposed meaning of "this application" is an attempt at linguistic gymnastics and makes little sense relative to the straightforward, plain language meaning of the phrase. For example, section 201.11 of the Manual of Patent Examining Procedure ("M.P.E.P."), which provides instructions on claiming the benefit of an earlier filing date under 35 U.S.C. §§ 120 and 119(e), repeatedly uses the phrase "this application" to refer to the present application. See, e.g., M.P.E.P. § 201.11 (8th ed. rev.5, Aug. 2006) ("The relationship between the applications is whether the instant application is a continuation, divisional, or continuation-in-part of the prior nonprovisional application. An example of a proper benefit claim is `this application is a continuation of prior Application No. ___, filed ___.'"). Our opinions also use and interpret "this application" in the self-referential sense to mean the "present application." See, e.g., Santarus, Inc. v. Par Pharm., Inc., 694 F.3d 1344, 1360-61 (Fed.Cir.2012) (Newman, J., concurring-in-part and dissenting-in-part) (noting that the patent application properly claimed priority under § 120 when it disclosed all prior applications with "no break in the chain of priority" and concluded with, "This application claims priority to all such previous applications...."); Broadcast Innovation, L.L.C. v. Charter Commc'ns, Inc., 420 F.3d 1364, 1366 (Fed. Cir.2005) (interpreting "[t]his application is a divisional" to set forth the priority chain of the present application); Zenon Envtl., Inc. v. U.S. Filter Corp., 506 F.3d 1370, 1383 (Fed.Cir.2007) (interpreting "[t]his application is a continuation of" to set forth the chain of co-pending applications from the present application).

Next, Medtronic argues that the meaning of the phrase "this application" should not be rigidly determined, but instead should be based on what a reasonable person would understand it to disclose within the context. In the context of the '281 patent, the phrase should be interpreted to mean "U.S. Application 4" in U.S. Applications 6 and 8 because, Medtronic asserts, any reasonable person "reviewing the priority claims would understand that the only application that is identified in the priority claims that could be the continuation-in-part [of International Application 2b] is [U.S.] Application 4." Appellant's Br. 24-25. Medtronic made a similar argument to the district court that anyone "of ordinary skill in the art" would understand "this application" in U.S. Applications 6 and 8 to refer to U.S. Application 4 because every other patent application in the priority chain was filed too late to fit the bill.6 The district court rejected this argument. SJ Order, at 8 n. 10. Citing MacDermid Printing, 525 F.3d at 1361, Medtronic similarly urges on appeal that the test for determining whether a priority claim contains the specific reference required by § 120 is whether a reasonable person reading the language of the claim would be able to determine the relationship between the priority applications. It submits that the language of a priority claim should not exist in isolation, but should be interpreted by an interested reader who discerns the context.

We decline to adopt the "reasonable person" test proposed by Medtronic to interpret the sufficiency of a priority claim under 35 U.S.C. § 120. Medtronic's proposal runs afoul of the language of the statutory provision, which requires "a specific reference" to each earlier filed application, as well as the implementing regulation for § 120, which requires precise details in priority claims down to the "application number (consisting of the series code and serial number)," 37 C.F.R. § 1.78(a)(2)(i).

The reasons for the required precision are apparent. Medtronic claims that a reasonable person interpreting the phrase "this application" in context would have concluded that it unambiguously meant "U.S. Application 4," because that was the only application that could have been a continuation-in-part of International Application 2b based on its filing date. The reasonable person would not be so certain, however. As Edwards points out, U.S. Application 4's predecessor, U.S. Patent Application Serial No. 10/130,355 ("U.S. Application 3"), filed on November 26, 2002, also comes within the thirty month cutoff date and would have been just as reasonable a contender as U.S. Application 4 to be the application to which "this application" referred. Ultimately, a closer look at the '281 patent's complicated priority recitations, as well as an understanding of § 120's disclosure requirements, would have eliminated U.S. Application 3 as a candidate because it neither claims priority to International Application 2b nor does it belong to the same priority chain as the Asserted Claims.7 However, such a conclusion would come to light only if the reasonable person had a sufficient understanding of prosecution procedure and litigation subject matter. These nuances demonstrate the difficulty in ascertaining the correct priority chain of a patent application that did not contain "specific references."

The patentee is the person best suited to understand the genealogy and relationship of her applications; a requirement for her to clearly disclose this information should present no hardship. Accord Sticker Indus. Supply Corp. v. Blaw-Knox Co., 405 F.2d 90, 93 (7th Cir.1968). On the contrary, Medtronic's "reasonable person" test improperly places the burden of deciphering a priority claim upon the reader or the public. Cf. Sampson v. Ampex Corp., 463 F.2d 1042, 1045 (2d Cir. 1972) (observing that the "specific reference" requirement under § 120 has the purpose of ensuring that someone examining a patent claiming the benefit of an earlier filed application is able to determine the priority date with "a minimum of effort"). Allocating the responsibility of disclosure through specific references to the patentee eliminates the inefficiencies associated with having the public expend efforts to unearth information when such information is readily available to the patentee. See Sticker Indus., 405 F.2d at 93 ("Congress may well have thought that Section 120 was necessary to eliminate the burden on the public to engage in long and expensive search of previous applications in order to determine the filing date of a later patent.").

Lastly, Medtronic's reliance on MacDermid Printing is similarly misplaced. The issue in that case was whether a reference in a non-provisional application was sufficient to claim priority to a provisional application under 35 U.S.C. § 119(e). MacDermid Printing, 525 F.3d at 1361. Although the patentee in MacDermid Printing correctly disclosed and identified the relationship between the two applications, it did so without using the phrase "claims the benefit of," an example of acceptable "priority" language provided by the M.P.E.P. Id. In contrast to MacDermid Printing, where certain magic words were not used but the priority claim was otherwise correct, here Medtronic used language suggested by the M.P.E.P. in a contrary manner, and additionally failed to disclose the correct relationships between the applications at issue.

We have considered Medtronic's remaining arguments and do not find them persuasive. Summary judgment of invalidity in this case was predicated on the determination of the priority date of the '281 patent. Because Medtronic failed to specifically reference each earlier filed application in the intervening applications in the chain of priority for the '281 patent under 35 U.S.C. § 120, the district court was correct to limit the priority date of the patent to no earlier than April 10, 2003 and thereafter find the Asserted Claims invalid as anticipated. For the foregoing reasons, the judgment of the district court is affirmed.

AFFIRMED.