Granted Patent
Utility
US 5,526,662 · App. 08/174,873
Cashless key and receptacle system
Inventors:
Robert R. Diekhoff, Joseph H. Sutton, Hazem Hassan, Michael Boehner
Patented Case
View Patent ↗
Granted: Jun 18, 1996
Filed: Dec 28, 1993
Inventors
Robert R. Diekhoff
Joseph H. Sutton
Hazem Hassan
Michael Boehner
Assignees (at issue)
Duncan Industries Parking Control Systems
Datakey, 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.