Granted Patent
Utility
US 4,892,998 · App. 07/138,857
Semi-conductive electrical heating device with voids
Inventors:
John A. Marstiller, Paul H. Bodensiek, Frederick G. J. Grise
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Dec 29, 1987
Inventors
John A. Marstiller
Paul H. Bodensiek
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.