Series Code

An identification number assigned by the US Patent Office to applications, which have received a filing date.

2 - earlier than 1-1-1948
3 - 1-1-1948 to 12-31-1959
4 - 1-1-1960 to 12-31-1969
5 - 1-1-1970 to 12-31-1978
6 - 1-1-1979 to 12-31-1986
7 - 1-1-1987 to 12-31-1992
8 - 1-1-1993 to 12-31-1997
9 - 1-1-1998 to current
29 - Designs applications (January 1993 on)