Granted Patent
Utility
US 4,297,661 · App. 06/108,248
Ferrite substrate microwave filter
Inventor:
Ronald E. Stegens
Patented Case
View Patent ↗
Granted: Oct 27, 1981
Filed: Dec 27, 1979
Inventor
Ronald E. Stegens
Assignee (at issue)
Communications Satellite Corporation
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.