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Oct 30, 2017 at 22:50 comment added Chezare The additional information I got by USPTO Assignment Tool regarding contacts is the name of the person for Correspondence with the Law Firm. No other additional contact data (in addition to what has been publish in the patent) were revealed by the USPTO Assignment Tool.
Oct 29, 2017 at 16:55 comment added rhymes_with_dorange @Chezare You may be able to find the owner of the patent using the USPTO Assignment tool. However, if the patent has expired because of unpaid maintenance fees, then it is unlikely that the assignee is concerned about about maintaining its validity (they let it expire, and so it can no longer be used to protect their claim to the invention). In fact, it's entirely possible that they've gone out of business. That said, you can certainly try—I just wouldn't hold out too much hope for cooperation. I'm not even sure if the USPTO will correct an expired patent.
Oct 28, 2017 at 22:11 comment added Chezare In that case, the best way is to contact the Law Firm of the patent to arrange for the agreement of the other party as they have the contact number (I don't). I could cover their fees for the same, and they will have an interest to keep the patent be legal instead of dealing with court defending the other party. Is this approach the best I should try first?
Oct 28, 2017 at 18:53 history answered rhymes_with_dorange CC BY-SA 3.0