How is the US patent registry easy to search ? I would be curious to see the patent registration of OpenAI, Anthropic, Google, etc. One way or another, I do fully expect every of those companies to try to fill these kinds of "almost for sure invalid and overturnable" patent as a way to defend themselves from every other actor (the classic "Oh I infringed on your patent ? Well here are some of MY patent you are infringing on, so let's call it a day").

https://ppubs.uspto.gov/pubwebapp/ try this

Believe it or not, but law offices make heavy use of https://patents.google.com/