I thought prior art only worked for published (prior) art? E.g. I can't claim I invented something before you if I never published/released my invention? Edit:

I thought prior art only worked for published (prior) art? E.g. I can't claim I invented something before you if I never published/released my invention? Edit: Literally the first two paragraphs of wikipedia: https://en.wikipedia.org/wiki/Prior_art https://en.wikipedia.org/wiki/Prior_art