370 F. Supp. 3d 251
D.D.C.2019Background
- IV sued EMC for infringement of claim 11 (dependent) of U.S. Patent No. 6,516,442 (the '442 patent); claim 11 depends from independent claim 1 and adds "the microprocessors and the memory device."
- EMC petitioned the PTAB for inter partes review (IPR) challenging several claims of the '442 patent based in part on prior art Reschke, which was not presented during original prosecution. IV defended in the IPR and did not appeal the PTAB's final decision.
- The PTAB instituted review and issued a Final Written Decision finding independent claim 1 unpatentable as obvious over Reschke, concluding Reschke disclosed the switch fabric, channels, switch interfaces, microprocessor interfaces, and memory interface limitations of claim 1.
- After the PTAB cancelled claim 1 and IV declined to appeal, the only remaining asserted claim against EMC was dependent claim 11.
- EMC moved for summary judgment that claim 11 is invalid, arguing (1) collateral estoppel (issue preclusion) bars IV from relitigating claim 11 because the differences from claim 1 do not materially alter the invalidity question, and (2) claim 11 is obvious over Reschke as a matter of law.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Whether IV is collaterally estopped from asserting dependent claim 11 after PTAB found independent claim 1 invalid | Claim 11 must be analyzed separately; PTAB applied different burden and claim-construction standards, so preclusion is inappropriate | PTAB's final invalidity finding for claim 1 has preclusive effect; claim 11 adds only microprocessors and memory device and does not materially alter invalidity | Court: Yes. Collateral estoppel applies; addition of microprocessors and memory device does not materially alter the §103 analysis, so claim 11 is invalid. |
Key Cases Cited
- Rodríguez-García v. Miranda-Marín, 610 F.3d 756 (1st Cir. 2010) (elements required for issue preclusion in the First Circuit)
- Soverain Software LLC v. Victoria's Secret Direct Brand Mgmt., LLC, 778 F.3d 1311 (Fed. Cir. 2015) (identity-of-issues, not complete claim identity, governs preclusion for patent claims)
- XY, LLC v. Trans Ova Genetics, 890 F.3d 1282 (Fed. Cir. 2018) (PTAB final invalidity decisions can have preclusive effect in district court)
- Fresenius USA, Inc. v. Baxter Int'l, Inc., 721 F.3d 1330 (Fed. Cir. 2013) (final PTO invalidity decisions treated like final court decisions for preclusion purposes)
- Ohio Willow Wood Co. v. Alps S., LLC, 735 F.3d 1333 (Fed. Cir. 2013) (differences between claims do not preclude preclusion unless they materially alter the invalidity question)