As I understand it matters against “prior art” defense. Basically if you patent someone else’s work, it invalidates the patent. But if you can prove that, you a

As I understand it matters against “prior art” defense. Basically if you patent someone else’s work, it invalidates the patent. But if you can prove that, you are the first to work on this, doesn’t really matter when you patented. Patenting years later is basically giving right to people to use your patent, if you started implementing before the patent date.