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Could you please tell me whether patent number US5715629 is still in force?

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The Application Data tab for this patent on the Public Patent Application Information Retrieval (PAIR) site (http://portal.uspto.gov/pair/PublicPair) indicates "Patent Expired Due to NonPayment of Maintenance Fees Under 37 CFR 1.362"

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You can also see this information reflected on the google patents page, at the bottom. –  George White Feb 10 at 3:04

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