Granted Patent
Utility
US 4,626,664 · App. 06/654,772
Electrical heating device
Inventor:
Frederick G. J. Grise
Patented Case
View Patent ↗
Granted: Dec 2, 1986
Filed: Sep 26, 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.