In reference to the patent: US3792680

Is Francis Allen still in ownership of the patent? Or did he sell it? If so, when?

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    I'm not sure there is any way to tell without asking him. The patent expired many years ago so doesn't really matter. – Eric Shain Mar 24 '17 at 18:12

I don't know of any data sources one can check for the current owner of a patent. The best bet is either a web search, or an attempt to contact the original assignee of the patent. In this case, the patent expired many years ago so the current owner would seem to be a moot point.

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