Granted Patent
Utility
US 4,707,702 · App. 06/818,546
Circularly polarizing antenna feed
Inventor:
Michael Withers
Patented Case
View Patent ↗
Granted: Nov 17, 1987
Filed: Jan 13, 1986
Inventor
Michael Withers
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.