Granted Patent
Utility
US 6,533,629 · App. 09/552,526
Spark plug including a wear-resistant electrode tip made from a co-extruded composite material, and method of making same
Inventors:
Jeffrey T. Boehler, Gary B. Zulauf
Patented Case
View Patent ↗
Granted: Mar 18, 2003
Filed: Jul 13, 1999
Inventors
Jeffrey T. Boehler
Gary B. Zulauf
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.