Samsung (5:20-cv-08205) has asked the Northern District of California for declaratory judgments of noninfringement of three patents held by NPEs Longhorn IP LLC and Trenchant Blade Technologies, LLC, seeking enforcement of a prior covenant not to sue in the same complaint. The semiconductor fabrication patents originated with TSMC, which assigned the assets to Trenchant Blade this past March, on the same day that litigation between Katana Silicon Technologies LLC and TSMC was dismissed. In April, Trenchant Blade allegedly sent a letter indicating an intent to license the acquired assets to multiple companies, including GlobalFoundries, Intel, Micron, SK hynix, SMIC, and UMC, as well as Samsung. The relationship between Katana Silicon, Longhorn IP, and Trenchant Blade is at the center of Samsung’s new complaint.