Take the 2-minute tour ×
Ask Patents is a question and answer site for people interested in improving and participating in the patent system. It's 100% free, no registration required.

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

share|improve this question

1 Answer 1

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)

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.