Granted Patent
Utility
US 4,542,982 · App. 06/576,017
Light sensitive validating identification badge system
Inventor:
David J. Haas
Patented Case
View Patent ↗
Granted: Sep 24, 1985
Filed: Feb 1, 1984
Inventor
David J. Haas
Assignee (at issue)
Temp Badge Security Systems, 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.