Granted Patent
Utility
US 3,973,085 · App. 05/509,398
Key telephone system with directly associated station cards and sets
Inventor:
Milo B. Shiff
Patented Case
View Patent ↗
Granted: Aug 3, 1976
Filed: Sep 26, 1974
Inventor
Milo B. Shiff
Assignee (at issue)
ANACONDA, 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.