Granted Patent
Utility
US 4,972,457 · App. 07/301,521
Portable hybrid communication system and methods
Inventor:
Harry M. O'Sullivan
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Jan 19, 1989
Inventor
Harry M. O'Sullivan
Assignee (at issue)
Spectrum Information Technologies, 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.