How long does a patent last?

Utility patents maturing from applications filed after June 8, 1995, last 20 years from the date of filing.  Design patents last 14 years from the date of filing.  However, delays in prosecution caused by the patent office can results in patent term extensions.

Once a utility patent issues, maintenance fees are required to keep the patent in force.  A first maintenance fee is due approximately 4 years after the patent issues, the second maintenance fee is due approximately 8 years after the patent issues and the third and final maintenance fee is due approximately 12 years from the issue date.  Non-payment of any maintenance fee when it is due results in abandonment of the patent.

If you would like help determining how long a particular patent will last or otherwise discuss your patent matters with an experienced patent attorney, contact me to schedule a free initial consultation.