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:

B5093617	20001219	B1
B4490209	20001219	B2
C5775534	20010102	C1
CD350855	20020108	C1
CRE33507	20020528	F1
C4940488	20020618	C2
BRE33209	19960116	F2