Granted Patent
Utility
US 4,347,407 · App. 06/181,590
Electronic telephone circuit
Inventor:
Peter F. Blomley
Patented Case
View Patent ↗
Granted: Aug 31, 1982
Filed: Aug 27, 1980
Inventor
Peter F. Blomley
Assignee (at issue)
International Standard Electric 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.