I found about the patent too late while searching for eventual patent. The main idea of the patent under question was entirely my own. It was first implemented in a prototype, and then a production facility was setup in Japan. The patent was issued to two other inventors. One ofthem I knew very well and we worked together on the prototype. Unfortunately, He passed away last year. I do not know the other inventor and I could not find any clue about him nor about the Company name mentioned in the patent (neither could my friends in Japan).
I have all the evidence (and I have witnesses abroad, too) to prove that I am the main Inventor of the patent. Who I should contact so that my name is included as an Inventor of the patent:
- the law firm under the correspondence address?
- the US Patent Bureau?
- or third party law firm?
Does it matter if the patent has expired because the fees have not been paid?