The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 21, 1989
Filed:
May. 03, 1989
Applicant:
Inventor:
Gamdur S Mann, Grand Blanc, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01I / ; H01I / ;
U.S. Cl.
CPC ...
445-7 ; 148285 ; 148287 ; 148 16 ; 313130 ;
Abstract
A spark plug has a center electrode and a side electrode made of an iron-base, heat resistant (iron, chromium, aluminum, rare earth) alloy. Each electrode has a precious metal insert of a composition that thermally matches the base alloy of the electrodes. The electrodes are made by a method which coats the electrodes with a protective coating to reduce operational oxidation and lead/oil deposit degradation of the interface between such iron based heat resistant alloys and an insert button in the center and side electrodes so as to extend the spark plug's life.