Patent Document Authority Files

Reexamination Certificates file layout

The first field is eight positions and contains the "Document Number".

The second field is eight positions and contains the "Publication Date" in a YYYYMMDD format.

The third field is two positions and contains the patent "Kind of Document Code".

Example:

B509361720001219B1
B449020920001219B2
C577553420010102C1
CD35085520020108C1
CRE3350720020528F1
C494048820020618C2
BRE3320919960116F2