IP Library › Granted Patent US 5,978,469
Granted Patent Utility
US 5,978,469 · App. 08/785,113

Apparatus for telephone extension control

Inventor: Harvey J. Benson
Patented Case View Patent ↗
Granted: Nov 2, 1999 Filed: Jan 21, 1997
Inventor
Harvey J. Benson
Assignees (at issue)
U S West, Inc.
MediaOne Group, 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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 5,978,469
App. No.
08/785,113
Filed
1997-01-21
Granted
1999-11-02
Kind
A