Granted Patent
Utility
US 4,547,002 · App. 06/550,401
Credit and identification cards having pieces of diffraction grating therein
Inventor:
Gilbert Colgate, Jr.
Patented Case
View Patent ↗
Granted: Oct 15, 1985
Filed: Nov 10, 1983
Inventor
Gilbert Colgate, Jr.
Assignee (at issue)
U.S. Banknote Corporation
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.