Granted Patent
Utility
US 4,422,075 · App. 06/265,880
Proximity monitor
Inventor:
Eldon Nerheim
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: May 21, 1981
Inventor
Eldon Nerheim
Assignee (at issue)
Honeywell Limited
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.