Granted Patent
Utility
US 5,268,931 · App. 07/459,178
Data communication system
Inventors:
Michael Cooperman, Philip L. Andrade
Patented Case
View Patent ↗
Granted: Dec 7, 1993
Filed: Dec 29, 1989
Inventors
Michael Cooperman
Philip L. Andrade
Assignee (at issue)
GTE Laboratories Incorporated
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.