U.S. Application Series Codes

The USPTO assigns series code prefixes to patent application serial numbers in order to distinguish between the various types of applications and proceedings. Utility and plant patent applications are assigned numbers ranging from 1 through 999,999. The number 10/100,000 indicates the one hundred thousandth application filed in series 10, which was used from October 24, 2001 through June 30, 2005.

Design patent applications were assigned serial numbers in the same series as utility patent applications from 1882 through 1921 and 1971 through 1992.

Table 1. USPTO Series Codes, 1925-present

Code Years
1 Jan. 1, 1925 – Dec. 31, 1934
2 Jan. 1, 1935 – Dec. 31, 1947
3 Jan. 1, 1948 – Dec. 31, 1959
4 Jan. 1, 1960 – Dec. 31, 1969
5 Jan. 1, 1970 – Dec. 31, 1978
6 Jan. 1, 1979 – Dec. 31, 1986
7 Jan. 1, 1987 – Dec. 31, 1992
8 Jan. 1, 1993 – Dec. 31, 1997
9 Jan. 1, 1998 – Nov. 30, 2001
10 Oct. 24, 2001 – June 30, 2005
11 Dec. 1, 2004 – Dec. 1, 2007
12 Dec. 6, 2007 – Mar. 2011
13 Dec. 2010 – Aug. 2013
14 Aug. 2013 – present
29 Design applications, Oct. 1, 1992 – present
60 Provisional applications, June 8, 1995 – Dec. 2007
61 Provisional applications, Dec. 2007 – present
90 Reexamination proceedings (ex parte), 1981 – present
95 Reexamination proceedings (inter partes), 2001 – present
96 Supplemental reexamination proceedings, 2013 – present

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