When Do Gun Patents Expire?
In case anyone refers back to this thread, I'll offer my professional answer.
The info here is good, but not quite precise. Of course, pistol patents are no different than other patents (except that they’re usually much more interesting).
Recent patents filed after June 1995 expire 20 years after their
filing date.
The filing date is based on the earliest patent application that the patent is based on (this may be a provisional, foreign filing, or parent in a continuation case.) So if you aren’t sure, it means that a patent may be expired when you thought it wasn’t.
Old patents (filed pre-1995) expired 17 years after their
issue (grant) date.
Patent applications pending at the 1995 transition file at the later of the two.
Patents also expire for failure to pay maintenance fees.
For a good article on
How to Search Gun Patents (and any other type or patent) you can click to read a recent article from my website. This will lead you to find any patent, to gather up the info you need to know when it will expire.
Ben Langlotz