Ask Patents is a question and answer site for people interested in improving and participating in the patent system. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Would like to know if the US Patent, 5,714,464 is still a valid Patent?

share|improve this question

It appears the patent owner did not pay the 12th-year maintenance fee that was due by 2/3/10 with a surcharge. The USPTO's PAIR site indicates "Patent Expired Due to NonPayment of Maintenance Fees Under 37 CFR 1.362."

share|improve this answer

Your Answer


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.