Granted Patent
Utility
US 4,843,400 · App. 07/230,107
Aperture coupled circular polarization antenna
Inventors:
Chich-Hsing A. Tsao, Thomas E. Roberts
Patented Case
View Patent ↗
Granted: Jun 27, 1989
Filed: Aug 9, 1988
Inventors
Chich-Hsing A. Tsao
Thomas E. Roberts
Assignee (at issue)
Ford Aerospace 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.