Federal Circuit affirms PTAB unpatentability of most claims of Centripetal Networks’ cybersecurity patent, then reverses PTAB on cross-appeal to find all 20 claims obvious — wiping out the patent entirely.
The Patent Trial and Appeal Board issued Final Written Decisions on April 17, 2026 invalidating all claims of two U.S. patents covering TOPCon solar cell technology that Trina Solar had asserted against Canadian Solar subsidiaries in a dispute seeking over $144 million in damages.
The Patent Trial and Appeal Board invalidated all claims in two Trina Solar TOPCon solar cell patents, finding them obvious over prior art including a 2013 Fraunhofer Institute publication, in a pair of IPR proceedings brought by Canadian Solar and Runergy.
The U.S. Patent Trial and Appeal Board issued final written decisions invalidating all claims in two TOPCon solar cell technology patents asserted by Trina Solar against Canadian Solar subsidiaries, removing a key IP barrier in the competitive solar panel market.
The PTAB issued final written decisions invalidating all claims in two Trina Solar patents covering TOPCon solar cell technology, handing a major win to competitors Runergy and Canadian Solar in a patent battle spanning the ITC, Delaware, and California.
The Federal Circuit affirmed the PTAB’s finding that Universal Electronics’ voice-input remote control patent claims were unpatentable as obvious, in the latest chapter of the long-running patent battle between the two consumer electronics companies.
The Federal Circuit addressed the PTAB’s discretionary authority under § 314(a) to deny IPR petitions based on factors including the stage of parallel district court litigation and the efficiency of institution — affirming the PTAB’s broad discretion in institution decisions and its auth