Granted Patent
Utility
US 5,506,837 · App. 08/197,526
Cellular radio communication system which is selectively convertible into a trunked radio communication system for group calls
Inventors:
Michael Sollner, Alfons Eizenhofer
Patented Case
View Patent ↗
Granted: Apr 9, 1996
Filed: Feb 10, 1994
Inventors
Michael Sollner
Alfons Eizenhofer
Assignee (at issue)
U.S. Philips 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.