Granted Patent
Utility
US 4,523,183 · App. 06/374,338
Alarm-fault detecting system
Inventor:
Kenneth L. Frick
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: May 3, 1982
Inventor
Kenneth L. Frick
Assignee (at issue)
AT&T Bell Laboratories
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.