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:
Jul. 07, 2009
Filed:
Nov. 08, 2005
Paul Tinwell, Fayence, FR;
Paul Tinwell, Fayence, FR;
Other;
Abstract
A spark plug having a ground electrode with a precious metal pad welded to the ground electrode through a series of weld steps. The precious metal pad is a Pt-based pad which is attached to a side surface of the ground electrode via an attachment process that includes a resistance tack weld to initially secure the pad in place, a coining step to flatten the pad, a second resistance weld to form a permanent weld of the pad to the ground electrode, and a laser capping weld about the exposed periphery of the pad to seal the resistance weld. The laser capping weld comprises numerous overlapping weld spots that together form an annular weld bead located at or just below the discharge surface of the pad.