Granted Patent
Utility
US 4,523,085 · App. 06/572,678
Electrical heating device
Inventor:
Frederick G. J. Grise
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Jan 20, 1984
Inventor
Frederick G. J. Grise
Assignee (at issue)
Flexwatt 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.