Granted Patent
Utility
US 4,306,704 · App. 06/132,136
Self-heated solenoid
Inventor:
John F. Clark
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Mar 20, 1980
Inventor
John F. Clark
Assignee (at issue)
RCA 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.