Granted Patent
Utility
US 4,892,385 · App. 06/235,970
Sheet-material authenticated item with reflective-diffractive authenticating device
Inventors:
William M. Webster, Jr., John P. Russell
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Feb 19, 1981
Inventors
William M. Webster, Jr.
John P. Russell
Assignee (at issue)
General Electric Company
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.