Granted Patent
Utility
US 5,812,658 · App. 08/380,413
Method and circuit for failsafe switch-hook detection during fault in a telephone system
Inventors:
Gerald M. Cotreau, Donald K. Whitney
Patented Case
View Patent ↗
Granted: Sep 22, 1998
Filed: Jan 30, 1995
Inventors
Gerald M. Cotreau
Donald K. Whitney
Assignee (at issue)
HARRIS 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.