Granted Patent
Utility
US 4,351,547 · App. 06/083,763
Security document and method for making same using an alternating dot pattern
Inventor:
David Brooks
Patented Case
View Patent ↗
Granted: Sep 28, 1982
Filed: Oct 11, 1979
Inventor
David Brooks
Assignee (at issue)
Burroughs, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.