Granted Patent
Utility
US 4,501,956 · App. 06/303,439
Electrical resistance heating element
Inventors:
Hans A. Bergersen, Eilif Risberg
Patented Case
View Patent ↗
Granted: Feb 26, 1985
Filed: Sep 18, 1981
Inventors
Hans A. Bergersen
Eilif Risberg
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.