Granted Patent
Utility
US 4,825,448 · App. 06/893,916
Subscriber unit for wireless digital telephone system
Inventors:
David N. Critchlow, Graham M. Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana, Gregory L. Westling
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Aug 7, 1986
Inventors
David N. Critchlow
Graham M. Avis
Sandra J. K. Earlam
Karle J. Johnson
Bruce A. Smetana
Gregory L. Westling
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.