Voice over Internet Protocol patents asserted against Apple Inc., AT&T Corp., Verizon Wireless Services LLC, and Twitter Inc. didn’t cover patent-eligible subject matter, the Northern District of California ruled March 25.

The U.S. District Court for the Northern District of California dismissed the patent infringement case and invalidated Voip-Pal.com Inc.'s patents because they were directed to the abstract idea of routing phone calls.

The ruling shows which technologies may fail the patent eligibility test the U.S. Supreme...