
On October 10, 2024, during an oral argument, the Federal Circuit was presented with an argument that patent applications, filed before the filing date of the challenged patent but not published until after the filing date of the challenge patent, are not “printed publications.” The panel admitted that the argument carried weight, creating worry in the patent community of potential impacts of such a ruling. However, the Federal Circuit issued its opinion on January 14, 2025, finding that a patent application is prior art and that the effect of the application as prior art stems from its filing, not its publishing date.[1]
The case is Lynk Labs, Inc. v. Samsung Electronics Co., Ltd., which followed a finding of unpatentability by the PTAB in an inter partes review (IPR). The Board’s ruling, challenged by Lynk Labs, found that a patent application filed before Lynk Labs’ priority date, but published after, could be used as prior art to invalidate the challenged claims. The prior art application introduced by Samsung was abandoned and a patent was never issued. Nevertheless, the Federal Circuit agreed with the PTAB’s decision.
Section 311(b) of the America Invents Act (AIA) states that a patent can be challenged in an IPR “only on the basis of prior art consisting of patents or printed publications.”[2] Lynk argued that a patent application that was not published prior to a challenged patent’s filing date is not included in “printed publications” because it was not publicly available at the critical time. Lynk cites to a handful of case law in saying that “the statutory phrase ‘printed publication’ has been interpreted to mean that before the critical date [of the challenged patent] the reference must have been publicly accessible to the public interested in the art.”[3] Lynk argued that had Congress intended patent applications to be used as prior arts in IPR, it would not have expressly left them out as a category in 311(b).[4]
The Federal Circuit agreed with Lynk: “The touchstone of whether a refence constitutes a printed publication is public accessibility.” citing Weber, Inc. v. Provisur Techs., Inc., 92 F.4th 1059, 1067 (Fed. Cir. 2024). However, the Court goes on to critique Lynk’s focus of printed publications under 35 U.S.C. § § 102(a) and 102(b). The Court points out that Congress created a “special rule” in § 102(e)(1)[5] for published patent applications. Under § 102(e)(1), a person shall be entitled to a patent unless “(e) the invention was described in – (1) an application for patent, published under 122(b), by another filed in the United States before the invention by the applicant for patent.” (emphasis added).
Because patent applications are published and publicly accessible, they are printed publications. Further, as stated by the Court, “102(e)(1) treats this type of printed publication as prior art as of a time before it became publicly accessible—i.e., as of its filing date.” The term “printed publications” does not have its own temporal element. Rather, such element is found in the applicable statute for each type of printed publication. The rule for patents as prior art presents similar wording, granting a patent prior art status as of its filing date.[6] Thus, in a similar IPR situation, 311(b) can include as prior art a patent that did not become a patent until after the challenged patent’s priority date.
Ultimately, the Court concluded that “the plain language of §§ 311(b) and 102(e)(1) permits IPR challenges based upon published patent applications, and such published patent applications can be deemed prior art in IPRs as of their filing date.” Additionally, the Court went on to analyze the historical context of 311(b), finding nothing to sway its interpretation. Finally, the Court further confirmed its interpretation, finding that making patent applications available as prior art under 311(b) is fully consistent with Congress’s purpose in limiting the types of patentability challenges in IPRs.
The Federal Circuit’s ruling eases the worries of the patent community and maintains the status quo. A contrary decision would call into question previous IPRs which relied on applications as printed publications to invalidate challenged claims. Fortunately, the Federal Circuit avoided such consequences, following years of precedent and the clear language of the law.
[1] Lynk Labs, Inc. v. Samsung Elecs. Co., Ltd., Case No. 2023-2346, (Fed. Cir. 2025) (23-2346.OPINION.1-14-2025_2450365.pdf).
[2] 35 U.S.C. § 311(b).
[3] In re Klopfenstein, 380 F.3d 1345, 1348 (Fed. Cir. 2004); see also Acceleration Bay, LLC v. Activision Blizzard Inc., 908 F.3d 765, 772 (Fed. Cir. 2018) (explaining that public accessibility is the “touchstone in determining whether a reference constitutes a ‘printed publication,’” and then noting the Board’s finding that the reference “was not publicly accessible before the critical date” (emphasis added) (cleaned up)); In re Lister, 583 F.3d 1307, 1311 (Fed. Cir. 2009) (“In order to qualify as a printed publication within the meaning of § 102, a reference ‘must have been sufficiently accessible to the public interested in the art.’” (citation omitted));
[4] Stephen Schreiner, attorney for Lynk Labs, details his argument at Patent Applications Published After the Priority Date of a Challenged Patent Are Not ‘Printed Publications’ for IPRs.
[5] This case was governed by pre-AIA language.
[6] See pre-AIA 35 U.S.C. § 102(e)(2) and current 35 U.S.C. § 102(d).