If a patent is successfully invalidated here, it seems to me like we'd need an easy way to call attention to it for our friends at the patent office. Upvotes are good, but they're far from definitive, or sufficiently organized.
I would suggest new labels that we can apply to answers. Depending on how many are ultimately adopted, they may be named "Possibly Invalidated", "Likely Invalidated", "Definitely Invalidated", with more and more stringent upvote requirements for each. The labels would then be searchable. If other answers in the question provide additional evidence, the label might be expanded to "[...] Invalidated with Support".
Finally, I would suggest that such labels would generally be applied by high rep users, after examining posts exceeding the required threshold of upvotes, but that posts that manage to hit a certain higher threshold on their own would also be automatically labelled.