Asked about 1 year ago - Lubbock, TX
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It is usually twenty years from the filing date or 17 years from the issue date whichever is longer for the patent that issued in 1996. It should be Jan 21, 2014 for this patent but you need to hire your own attorney to confirm. Do not take my word for it. Calculation of patent expiration dates could be quite complex.
You should get an attorney. You might call the USPTO, they may not be helpful, but you might find someone to answer. Patent attorneys (at least in NC) pay some of the highest malpractice insurance. Let's just say it encourages us to be very thorough. I would not risk my insurance by providing any specific advice over the Internet.
The default for that patent, based on it's filing date would be 20 years from filing. However, there may be a patent term adjustment based on delays by the patent office which were not the fault of the applicant which would entitle them to additional time added to the end of the 20 year period. An attorney can review the case file and tell you exactly when the patent would expire. If you would like me to do so for you, please call my office.
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