Granted Patent
Utility
US 5,918,571 · App. 08/924,109
Dual electrode high thread spark plug
Inventor:
Matthew B. Below
Patented Case
View Patent ↗
Granted: Jul 6, 1999
Filed: Sep 5, 1997
Inventor
Matthew B. Below
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.