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It depends on a number of factors including: #what type of patent (design, utility, plant, etc), #when it was filed (its earliest priority date), #when it was issued, #where it was issued (which country), #whether it remains valid (if it ever was), #if there is a terminal disclaimer in the file, #whether the owner has paid periodic maintenance fees, #and if there are special adjustments to the patent term for the technology (such as for certain delays caused by federal approvals). For example, a utility patent filed in the USA in 1994 and issued in 1999 would have a statutory term of 17 years from date of issue (later than 20 years from date of filing, which was prior to 1995), but will expire on its 4th (or 8th or 12th) anniversary if the necessary maintenance fees and late charges are not filed, and may be invalidated earlier (in whole or in part) by various judicial findings, or may be extended by USPTO adjustments to compensate for delays in FDA approvals. International treaties have also attempted to have utility patents for the same invention expire simultaneously in most countries, based upon 20 years from the date of filing.

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17y ago

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