Granted Patent
Utility
US 4,012,744 · App. 05/624,040
Helix-loaded spiral antenna
Inventor:
John W. Greiser
Patented Case
View Patent ↗
Granted: Mar 15, 1977
Filed: Oct 20, 1975
Inventor
John W. Greiser
Assignee (at issue)
I-TEK, Inc.
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.