Granted Patent
Utility
US 4,544,836 · App. 06/452,308
Optically-based access control system
Inventors:
Aaron A. Galvin, Roy Harvey, Kenneth J. Leff
Patented Case
View Patent ↗
Granted: Oct 1, 1985
Filed: Dec 22, 1982
Inventors
Aaron A. Galvin
Roy Harvey
Kenneth J. Leff
Assignee (at issue)
American District Telegraph 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.