Granted Patent
Utility
US 4,646,064 · App. 06/681,167
Volume control device for ringer
Inventors:
Jerry D. Palmer, Robert J. Janus, Larry D. Lambert
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Dec 13, 1984
Inventors
Jerry D. Palmer
Robert J. Janus
Larry D. Lambert
Assignee (at issue)
ITT 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.