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*A patent filed after 8th June 1995 a patent could be renewed 3 times to a full term of 20 years from application.
*A patent filed after 29th May 2000 was eligible for Patent Term Adjustment provisions of 35 U.S.C. § 154(b).[http://www.uspto.gov/patents/process/search/public_pair/guidance/pta_calc_explanation.jsp] The average patent term adjustment is now approximately 600 days. In 2005 it was approximately 200 days. [http://www.patentlyo.com/patent/2011/07/pta.html] However, this will not affect the calculation of patent expirations until 2020.