Halo Electronics makes electronic packages for use on printed circuit boards. It has three patents on this technology, filed in 1995. Pulse Electronics also makes electronic packages for use on printed circuit boards. Uh oh. Thankfully, though, Pulse only sells its products in Asia.
Or does it? After Pulse incorporated some of its electronics into equipment sold by Cisco in the United States, Halo sent Pulse a polite letter asking if Pulse would like to enter into a license agreement. A Pulse engineer determined that Halo's patents were not invalid. Pulse never consulted a lawyer and kept selling its products anyway.