Changes
Jump to navigation
Jump to search
no edit summary
*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.
Letting last renewal number R = 1,2,3, and renewal to full term F = 0,1, I will therefore be using the following rules of thumb:
*appyear < 1981, expyear = gyear + 17
*1981 <= appyear <= 1995, expyear = gyear + 4*R + 5*F
*1995 < appyear <= 2020, expyear = appyear + 4*R + 8*F
