Granted Patent
Utility
US 4,477,698 · App. 06/415,711
Apparatus for detecting pick-up at a remote telephone set
Inventors:
Aleksander Szlam, Chester P. Quinn
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Sep 7, 1982
Inventors
Aleksander Szlam
Chester P. Quinn
Assignee (at issue)
Melita Electronic Labs, 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.