Granted Patent
Utility
US 4,384,401 · App. 06/312,685
Method for forming a heater element
Inventor:
Ronald J. Borrup
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Oct 19, 1981
Inventor
Ronald J. Borrup
Assignee (at issue)
Sierracin 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.