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us3611966 patent . please clarifiy if this patent is still valid . When the answer is positive ,is there any provided expiration date? l.marchisio

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If the patent application filing date was on or before June 8, 1995, the nominal expiration date is the longer of 17 years from the date of issue or 20 years from the earliest non-provisional priority claim. So it should have expired unless the owner renewed the patent. (I can't find the renewal date, but it was filed on June 4, 1969)

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