Granted Patent
Utility
US 4,675,690 · App. 06/613,911
Conical spiral antenna
Inventor:
Robert W. Hoffman
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: May 25, 1984
Inventor
Robert W. Hoffman
Assignee (at issue)
Revlon
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.