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:
Apr. 22, 1988
Mitusuke Masaka, Saitama, JP;
Koji Hatanaka, Saitama, JP;
Kenzi Maruta, Saitama, JP;
Hirohisa Suwabe, Saitama, JP;
Jidosha Kiki Co., Ltd., Tokyo, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A glow plug for a diesel engine includes an electrically conductive ceramic (e.g., SIALON) heater having a U-shaped heating portion with a pair of integral parallel leg portions extending into the end of an elongated metallic holder. The leg portions have a thickness larger than the U-shaped heating portion and are electrically insulated from the holder by an electrically insulative coating formed therebetween. An electrically insulating sheet having essentially the same thermal expansion coefficient as the ceramic heater fills the gap between the leg portions and is bonded thereto to form a seal preventing combustion products from reaching the interior of the holder. A pair of coaxially arranged external connecting terminals extend into the other end of the holder and are electrically connected to the leg portions.