Granted Patent
Utility
US 4,989,239 · App. 07/407,899
Method and apparatus for preventing pay telephone fraud and reducing handset vandalism
Inventor:
Patrick J. McGarry
Patented Case
View Patent ↗
Granted: Jan 29, 1991
Filed: Sep 15, 1989
Inventor
Patrick J. McGarry
Assignee (at issue)
Mars, Incorporated
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.