tl;dr American Axle sued Neapco in federal court in Delaware in 2015, accusing it of infringement of a patented method of manufacturing a driveshaft that vibra

tl;dr American Axle sued Neapco in federal court in Delaware in 2015, accusing it of infringement of a patented method of manufacturing a driveshaft that vibrates less. At issue were Neapco driveshafts made for the Chevy Colorado and GMC Canyon pickup trucks. A three-judge Federal Circuit panel voted 2-1 to invalidate American Axle's patent after finding that it covered a simple application of Hooke's law, a physics principle. The Federal Circuit nor Supreme court reheard the case.