Apple vs. HTC: https://en.wikipedia.org/wiki/Litigation_involving_Apple_Inc...
Normally, the threat implied by a patent moat is sufficient, so it doesn’t come to a lawsuit.
"[We] think competition is healthy, but competitors should create their own original technology, not steal ours"
Then they had the gall to sue HTC. Glad the judge ended up forcing their hand, a rare case where might didn’t make right.