Granted Patent
Utility
US 4,323,739 · App. 06/047,307
Telephone locking device
Inventors:
Louis Flax, Vincent Brzezinski
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Jun 14, 1979
Inventors
Louis Flax
Vincent Brzezinski
Assignee (at issue)
Televault, 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.