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. 03, 1985
Filed:
Oct. 11, 1984
Morihiro Atsumi, Okazaki, JP;
Hitoshi Yoshida, Okazaki, JP;
Nobuei Ito, Nukata, JP;
Kinya Atsumi, Toyohashi, JP;
Nippondenso Co., Ltd., Kariya, JP;
Nippon Soken, Inc., Nishio, JP;
Abstract
A ceramic heater comprises a heat generator made of a conductive ceramic sintered body, a supporter made of an insulating ceramic sintered body for supporting the heat generator, and a metallic wire for supplying an electric current from an electrode to the heat generator. The heat generator is integrally covered with an unporous covering layer made of an insulating ceramic sintered body. The covering layer prevents the heat generator from being directly exposed to oil and water. The covering layer is made of, for example Si.sub.3 N.sub.4 or glass containing SiO.sub.2 as a main constituent into a thickness of not more than 1mm.