Granted Patent
Utility
US 5,189,271 · App. 07/502,864
Temperature self-regulating induction apparatus
Inventor:
Rodney L. Derbyshire
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Apr 2, 1990
Inventor
Rodney L. Derbyshire
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.