Granted Patent
Utility
US 4,550,361 · App. 06/619,061
Adjustable multiturn air dielectric capacitor
Inventor:
Frank Swinehart
Patented Case
View Patent ↗
Granted: Oct 29, 1985
Filed: Jun 11, 1984
Inventor
Frank Swinehart
Assignee (at issue)
E.F. Johnson Company
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.