Granted Patent
Utility
US 4,775,847 · App. 06/939,822
Tunable resonant cavity filter structure with enhanced ground return
Inventors:
Robert L. Epsom, Terry K. Mansfield, Anthony M. Pirih, Scott J. Propp, Thomas L. Spicer
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Dec 9, 1986
Inventors
Robert L. Epsom
Terry K. Mansfield
Anthony M. Pirih
Scott J. Propp
Thomas L. Spicer
Assignee (at issue)
Motorola, 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.