Granted Patent
Utility
US 4,129,871 · App. 05/832,460
Circularly polarized antenna using slotted cylinder and conductive rods
Inventor:
McKinley R. Johns
Patented Case
View Patent ↗
Granted: Dec 12, 1978
Filed: Sep 12, 1977
Inventor
McKinley R. Johns
Assignee (at issue)
RCA 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.