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:
Aug. 01, 1989
Filed:
Apr. 05, 1988
Applicant:
Inventors:
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01T / ;
U.S. Cl.
CPC ...
313141 ; 313144 ;
Abstract
A spark plug for use in internal combustion engines having a pair of electrodes between which electric spark discharge is effected. The spark plug has a spark discharge portion bonded by, for example, resistance welding to at least one of the electrodes and made of a base metal containing at least 90 wt % of chromium (Cr). A stress-relieving portion having a thermal expansion coefficient intermediate in value between those of the electrode and the spark discharge portion may be formed between the electrode and the spark discharge portion.