Granted Patent
Utility
US 4,546,241 · App. 06/448,516
Electronic proximity identification system
Inventor:
Charles A. Walton
Patented Case
View Patent ↗
Granted: Oct 8, 1985
Filed: Dec 10, 1982
Inventor
Charles A. Walton
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.