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:
Jun. 25, 1996
Filed:
Oct. 24, 1994
Applicant:
Inventor:
Randolph K Chiu, Davison, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01T / ;
U.S. Cl.
CPC ...
313141 ; 313326 ; 313311 ; 313 115 ; 219 7801 ; 445-7 ;
Abstract
The present invention includes a spark plug with a copper cored ground electrode wherein the copper core has a cross-sectional area of about 1.6 mm.sup.2 to about 3.0 mm.sup.2 and the remainder of the electrode is made from a nickel alloy sheath. The open end copper cored ground electrode is resistance welded to the steel shell using a light welding force of about 100 lbs. coupled with a low welding energy to eliminate voids and embrittlement in the copper core adjacent to the weld interface.