Q: US6433276B1 Can I sell this product after the patent expires? Can Patents be renewed?
A: Patents cannot be renewed after the end of their full term (in contrast to trademarks and copyrights).
To be clear, a patent that goes abandoned early for failure to pay a maintenance fee can be revived if the failure was unintentional.
To the extent that one patent has expired, it is no longer a threat but there may be additional patents that are not expired on improvements so you should seek help from a patent attorney to look for any such patents.
If you found this answer helpful, you may want to look at my answers to other questions about patent law are available at the bottom of my profile page at
Kevin E Flynn
Kathryn Perales agrees with this answer
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