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:
Dec. 02, 1997
Filed:
Mar. 15, 1996
Hironori Osamura, Chiryu, JP;
Keiji Kanao, Okazaki, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A spark plug for an Internal combustion engine is provided. When it is assumed that the distance of a first spark gap (g1) defined by a central electrode (8) and a first grounding electrode (16) whose width is 'A' and which is axially opposed to the central electrode, and a second spark gap (g2) defined by the central electrode and at least one second grounding electrode (21) whose width is 'B' and which is opposed to the side surface of the central electrode, the relationship defined by 0.5.ltoreq..SIGMA.Bn/A.ltoreq.1.5 is established, wherein 'n' represents the number of the second grounding electrode to reduce the discharge voltage of the spark plug and maintain a high heat resistance. Preferably, the spark plug satisfies the relationship defined by 0.1 mm.ltoreq.g2-g1.ltoreq.0.4 mm to improve the ignitability of the spark plug.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile