Granted Patent
Utility
US 4,363,947 · App. 06/265,294
Electrical heating element
Inventor:
Hans A. Bergersen
Patented Case
View Patent ↗
Granted: Dec 14, 1982
Filed: May 20, 1981
Inventor
Hans A. Bergersen
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.