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:
Apr. 21, 2009
Filed:
Sep. 25, 2006
Karina Havard, Toledo, OH (US);
Robert Freeman, Monclova, OH (US);
Karina Havard, Toledo, OH (US);
Robert Freeman, Monclova, OH (US);
Federal-Mogul World Wide, Inc., Southfield, MI (US);
Abstract
A spark plug assembly () includes a center electrode () having a high performance metal sleeve () attached at its sparking end. The sleeve () is fitted to a tenon on the end of the center electrode () and fixed in place by a weld line () produced by laser beam pulses (). The weld line () is applied by overlapping a plurality of spaced-apart beads in a single, continuous circumscribing line. The sleeve () is permitted to expand and contract under the influence of thermal cycling without constraint except for the fixation weld line (). Therefore, the sleeve () does not experience stress build-ups resulting from differing rates of thermal expansion relative to the center electrode (), which is preferably made from a nickel or other composition dissimilar to that of the high performance metal sleeve (). Various ground electrode () configurations are possible.