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Use this link to research US Patent Numbers:

http://patft.uspto.gov/netahtml/PTO/srchnum.htm

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17y ago

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Related Questions

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The patent issue date for the keyword was on specific date.


What is the issue year of patent?

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How long does a patent last from 1992?

US patents are for 20 years, so a 1992 patent expired on its issue date in 2012.


How can I determine the expiration date of a patent?

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Which date is printed on a patent?

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How old is a revolver with patent 51668?

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Do you have any information on a shotgun with a patent date of Dec 11 1900 and serial number PG 639?

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