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.