Granted Patent
Utility
US 5,144,664 · App. 07/614,940
Apparatus and method for upgrading terminals to maintain a secure communication network
Inventors:
James Esserman, Jerrold A. Heller
Patented Case
View Patent ↗
Granted: Sep 1, 1992
Filed: Nov 16, 1990
Inventors
James Esserman
Jerrold A. Heller
Assignee (at issue)
General Instrument 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.