Granted Patent
Utility
US 4,378,539 · App. 06/259,312
Line choke
Inventor:
Carl R. Swanson
Patented Case
View Patent ↗
Granted: Mar 29, 1983
Filed: Apr 30, 1981
Inventor
Carl R. Swanson
Assignee (at issue)
Zenith Radio 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.