Granted Patent
Utility
US 4,697,158 · App. 06/852,146
Reduced height waveguide circulator
Inventors:
John C. Hoover, David E. Giese
Patented Case
View Patent ↗
Granted: Sep 29, 1987
Filed: Apr 15, 1986
Inventors
John C. Hoover
David E. Giese
Assignee (at issue)
Electromagnetic Sciences, 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.