Granted Patent
Utility
US 4,789,767 · App. 07/059,767
Autoregulating multi contact induction heater
Inventor:
Frank A. Doljack
Patented Case
View Patent ↗
Granted: Dec 6, 1988
Filed: Jun 8, 1987
Inventor
Frank A. Doljack
Assignee (at issue)
Metcal, Inc.
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.