What have been some major victories that have been won against such patents? Expiration of patents included.
Discussion
One that I am aware was the release of patents around video encoding/decoding with VP8, video on the web is far more standard as a result.
Schnorr signatures, kinda relevant for the nostr and bitcoin!
Another win from 2010 by decision of a jury:
https://www.redhat.com/en/about/press-releases/patent-verdict