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:
Oct. 18, 2005
Filed:
Feb. 13, 2002
Applicants:
Ken Hanashi, Aichi-pref., JP;
Yasutake Ishino, Aichi-pref., JP;
Inventors:
Ken Hanashi, Aichi-pref., JP;
Yasutake Ishino, Aichi-pref., JP;
Assignee:
Denso Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01T013/20 ;
U.S. Cl.
CPC ...
Abstract
A spark plug structure produces sparks between a second ground electrode and a center electrode when a porcelain insulator is stained with carbon. A wear resisting member is installed on a side wall of the center electrode for minimizing the wear of the side wall caused by the sparks to increase the useful life of the spark plug. A production method is also provided.