In reference to the patent: US5829213
How long is this patent in the U.S. and how do you know if it is still valid?
Ask Patents is a question and answer site for people interested in improving and participating in the patent system. It only takes a minute to sign up.Sign up to join this community
This is a tricky question since the patent laws changed that year
look it up here by patent number:
and learn about how long patents last here:
From the above reference: "All utility and plant patents that were in force on June 8, 1995, or that issued on an application that was filed before June 8, 1995, have a term that is the greater of the “twenty-year term” or seventeen years from the patent grant."
I believe both numbers expire the patent. 5-1-2015 or 11-3-2015
If this was helpful please select it as an answer and or up-vote the answer.
Always seek a professional opinion on these matters.