Granted Patent
Utility
US 5,382,780 · App. 08/130,587
Portable time metering device
Inventor:
Ralph H. Carmen
Patented Case
View Patent ↗
Granted: Jan 17, 1995
Filed: Oct 1, 1993
Inventor
Ralph H. Carmen
Assignee (at issue)
Duncan Industries Parking Control Systems
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.