In Sunpower Corporation v. PanelClaw, Inc., C.A. No. 12-1633-MPT (D. Del. Apr. 1, 2016), the parties had stipulated to Defendant’s filing of an early motion for summary judgment on limited issues. Id. at 2. To that end, Defendant moved for summary judgment of non-infringement on one patent and invalidity of another patent under Section 112 and/or Section 101. Chief Magistrate Judge Mary Pat Thynge granted the motion as to non-infringement, but denied the motion as to invalidity.
Defendant based its non-infringement defense on the PTAB’s construction of a certain term during the inter partes review. As this patent was expired, the PTAB did not adopt the broadest reasonable construction, instead applying a standard of review similar to that of district courts. Id. at 9-10. The Court found the PTAB’s construction “well-reasoned and persuasive” and adopted it, see id. at 13-14, and then concluded that Defendant’s accused products did not infringe one of the asserted patents, rejecting Plaintiff’s position that it was too early in the case to determine infringement where Defendant’s evidence of non-infringement was taken from Plaintiff’s own infringement contentions. See id. at 15.
Defendant also argued that the second patent-in-suit was invalid as indefinite, citing “certain statements and conclusion the PTAB made [regarding anticipation] in its  IPR decision, and the testimony of [Plaintiff’s] expert . . . as part of that IPR.” Id. at 17. But the Court agreed that Defendant had not met its burden based on the current record, noting that it was not bound by the PTAB’s discussion and that another district court had successfully construed the portion of the claim that Defendant argued was indefinite. Id. at 19-20. As to Defendant’s enablement, written description and/or inoperability, the Court concluded that its “conclusory” attorney arguments were insufficient. See id. at 24-25.