Granted Patent
Utility
US 4,899,165 · App. 07/261,049
Variable circular polarization antenna having parasitic Z-shaped dipole
Inventor:
John L. Schadler
Patented Case
View Patent ↗
Granted: Feb 6, 1990
Filed: Oct 20, 1988
Inventor
John L. Schadler
Assignee (at issue)
Federal Signal 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.