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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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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 ...