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:
Apr. 03, 1990
Filed:
Jul. 19, 1989
Koji Hatanaka, Saitama, JP;
Takashi Aota, Saitama, JP;
Kenji Maruta, Saitama, JP;
Hirohisa Suwabe, Saitama, JP;
Seiji Okazaki, Saitama, JP;
Jidosha Kiki Co., Ltd., Shibuya, JP;
Hitachi Metals, Ltd., Chiyoda, JP;
Abstract
A glow plug for a diesel engine includes a hollow holder, and a ceramic heater made of SiAlON extending through a distal end portion of the hollow holder and held by it. The ceramic heater is provided with a U-shaped heating element and a pair of lead portions extending backward from both ends of the U-shaped heating element and parallel to each other. The heating element and the pair of lead portions are integrally made of a resistive ceramic material. One of the lead portions is coupled to one end of an electrically conducting flexible wire, the other end of the wire being coupled to an external connecting terminal. A ration .epsilon.(.dbd.SH/SL) of cross-sectional areas SH of the U-shaped heating element to cross-section areas SL of the lead portions falls within the range of 0.15.ltoreq..epsilon..gtoreq.0.6.