Granted Patent
Utility
US 4,943,983 · App. 07/256,580
Subscriber unit for wireless digital telephone system
Inventor:
David N. Critchlow
Patented Case
View Patent ↗
Granted: Jul 24, 1990
Filed: Oct 12, 1988
Inventor
David N. Critchlow
Assignee (at issue)
International Mobile Machines Corporation
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.