Changes

Jump to navigation Jump to search
605 bytes added ,  16:27, 6 September 2012
*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 + 4*R + 1*F
*1995 < appyear <= 2020:
** if F=0 expyear = gyear + 4 + 4*R
** if F=1 expyear = appyear + 20
 
 
In the cases when I don't have data on renewals for a patent filed after 1980, I will assume renewal to full term. The vast majority of these data points will be for patents that haven't yet had to renew (a first/second/third time). Thus they are valid beyond the end of my sample.
Anonymous user

Navigation menu