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Is U.S. Patent No. 5,637,320 expired? [duplicate]

Is the above patent currently expired? If not, when does it expire? If so, is there a continuation patent? If so, when does it expire?
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Can a patent filed more than 20 years ago still be valid?

I'm asking in particular about this patent. The filing year was 1991, so it is currently 23 years old. However, the fee status says "paid." Google Patents also does not mention anything about that ...
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Has this patent expired? 5,934,963 [duplicate]

I had designed a similar invention but, have found this patent already in force. It seems to have lapsed and been re-instated several times... Can you determine the current status?
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Has us6072466 expired due to non-payment?

I have checked uspto.gov and looking up the paying of the maintenance fees gives No fees paid for selected year - MF Stmt unavailable Which I am not sure is an error or whether it means the ...
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1answer
37 views

Expired patent - non-payment

hypothetical question. Let's assume someone else's patent has expired due to non-payment, and we release a product that that would potentially have infringed on it. Three months later they see our ...