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I want to know the date of expiration of VanWinkel's Liquid Mask patent 5618582.

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1 Answer 1

The patent application was filed on June 7, 1995 and issued on April 8, 1997.

US patents issuing from patent applications filed on or after June 8, 1995 have a term of 20 years from the earliest non-provisional patent application priority date. US patents issuing from patent applications filed prior to June 8, 1995 have a term equal to the greater of 17 years from issuance or 20 years from the earliest non-provisional patent application priority date.

In this case, since 17 years after issuance is greater, the patent expires on April 9, 2017.

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