Granted Patent
Utility
US 4,940,974 · App. 07/265,842
Multiterminal communication system and method
Inventor:
Marvin L. Sojka
Patented Case
View Patent ↗
Granted: Jul 10, 1990
Filed: Nov 1, 1988
Inventor
Marvin L. Sojka
Assignee (at issue)
Norand 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.