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:
Feb. 17, 1987
Filed:
Feb. 25, 1986
Morihiro Atsumi, Okazaki, JP;
Naochika Nunogaki, Kariya, JP;
Novuei Ito, Okazaki, JP;
Naohito Mizuno, Nishio, JP;
Nippondenso Co., Ltd., Kariya, JP;
Nippon Soken, Inc., Nishio, JP;
Abstract
A ceramic heater has a heater element made of a mixture including MoSi.sub.2 and Si.sub.3 N.sub.4 powder as a main ingredient and silica (SiO.sub.2) powder as an additive, a heater support member made of an electrically insulating ceramic sintered body for supporting the heater element and an electric current supply means for supplying an electric current to the heater element. The composition of the mixture for the heater element is defined so as to satisfy the following formula: 0.035.ltoreq.B/A<0.35 where A is the amount of Si.sub.3 N.sub.4 expressed by mol percent of the total amount of the main ingredient of MoSi.sub.2 and Si.sub.3 N.sub.4 and B is the amount of SiO.sub.2 expressed by mol percent of the total amount of the main ingredient of MoSi.sub.2 and Si.sub.3 N.sub.4.