IP Library › Granted Patent US 4,309,709
Granted Patent Utility
US 4,309,709 · App. 06/173,911

Dual frequency aerial feed arrangements

Inventor: Stewart C. Hill
Patented Case View Patent ↗
Granted: Jan 5, 1982 Filed: Jul 30, 1980
Inventor
Stewart C. Hill
Assignee (at issue)
The Marconi Company Limited

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 4,309,709
App. No.
06/173,911
Filed
1980-07-30
Granted
1982-01-05
Kind
A