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:
May. 10, 2005
Filed:
Aug. 15, 2002
Tsunenobu Hori, Kariya, JP;
Akihiko Mizutani, Kuwana, JP;
Hironori Osamura, Chiryu, JP;
Kozo Takamura, Nagoya, JP;
Tsunenobu Hori, Kariya, JP;
Akihiko Mizutani, Kuwana, JP;
Hironori Osamura, Chiryu, JP;
Kozo Takamura, Nagoya, JP;
Denso Corporation, Kariya, JP;
Abstract
An improved structure of a spark plug which provides higher durability of a joint of a noble metal chip to an electrode such as a center or a ground electrode. The joint is formed by laser welding. A fused portion made of materials of the noble metal chip and the electrode fused together by the laser welding is formed in the joint so that it may continue over at least half a circumference of a contact between the noble metal chip and the electrode without interfaces of welds, thereby enhancing the activity of the fused portion as a thermal stress absorber. A welding method is also provided.