Granted Patent
Utility
US 4,721,933 · App. 06/902,810
Dual mode waveguide filter employing coupling element for asymmetric response
Inventors:
Craig N. Schwartz, Louis W. Hendrick, Joseph Elliott
Patented Case
View Patent ↗
Granted: Jan 26, 1988
Filed: Sep 2, 1986
Inventors
Craig N. Schwartz
Louis W. Hendrick
Joseph Elliott
Assignee (at issue)
Hughes Aircraft Company
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.