IP Library Granted Patent US 4,644,305
Granted Patent Utility
US 4,644,305 · App. 06/804,079

Odd order elliptic waveguide cavity filters

Inventors: Wai-Cheung Tang, Joseph Frenna, David Siu
Patented Case View Patent ↗
Granted: Feb 17, 1987 Filed: Dec 3, 1985
Inventors
Wai-Cheung Tang
Joseph Frenna
David Siu
Assignee (at issue)
COM DEV LTD.

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 4,644,305
App. No.
06/804,079
Filed
1985-12-03
Granted
1987-02-17
Kind
A