Granted Patent
Utility
US 4,816,643 · App. 07/023,934
Glow plug having a metal silicide resistive film heater
Inventors:
Gary B. Zulauf, David Charles Weber
Patented Case
View Patent ↗
Granted: Mar 28, 1989
Filed: Mar 9, 1987
Inventors
Gary B. Zulauf
David Charles Weber
Assignee (at issue)
AlliedSignal, 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.