Granted Patent
Utility
US 5,602,532 · App. 08/360,982
Audio coupled annunciating system for electrical panel boxes
Inventor:
Barry D. Ryan
Patented Case
View Patent ↗
Granted: Feb 11, 1997
Filed: Dec 20, 1994
Inventor
Barry D. Ryan
Assignee (at issue)
A.C. Data Systems of Idaho, Inc.
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.