Granted Patent
Utility
US 4,409,440 · App. 06/324,788
Telephone index and switch arrangement
Inventor:
Robert M. Brodbeck
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Nov 25, 1981
Inventor
Robert M. Brodbeck
Assignee (at issue)
Marcamor, 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.