Granted Patent
Utility
US 4,355,259 · App. 06/187,865
Heater for an indirectly heated cathode
Inventor:
Eberhard Weiss
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: Sep 17, 1980
Inventor
Eberhard Weiss
Assignee (at issue)
International Standard Electric 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.