Granted Patent
Utility
US 4,623,401 · App. 06/827,680
Heat treatment with an autoregulating heater
Inventors:
Rodney L. Derbyshire, Paul F. Busch
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Feb 10, 1986
Inventors
Rodney L. Derbyshire
Paul F. Busch
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.