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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 maintance fee was actually not paid. Additionally Google Patents suggests the patent has lapsed, however I would expect the overview on the patent on uspto.gov to make some explicit mention if it has indeed expired, which is not the case, so just wished to double check whether my understanding is correct.

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