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:
Jul. 24, 2012
Filed:
May. 18, 2007
Koji Funaki, Nagoya, JP;
Yoshihito Ikai, Nagoya, JP;
Yutaka Sekiguchi, Nagoya, JP;
Takeshi Mitsuoka, Nagoya, JP;
Yutaka Yokoyama, Nagoya, JP;
Koji Funaki, Nagoya, JP;
Yoshihito Ikai, Nagoya, JP;
Yutaka Sekiguchi, Nagoya, JP;
Takeshi Mitsuoka, Nagoya, JP;
Yutaka Yokoyama, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
Disclosed is a ceramic heater capable of preventing failures due to the thermal stress, such as cracks, and corrosion by a calcium component. The ceramic heater has a heating element including at least one substance selected from silicides, nitrides and carbides of molybdenum and silicides, nitrides and carbides of tungsten as a main component, and a base mainly containing silicon nitride in which the heating element is embedded, wherein the base includes: a rare earth element component in an amount from 4 to 25% by mass in terms of an oxide thereof; a silicide of chromium in an amount from 1 to 8% by mass in terms of chromium silicide; and an aluminum component in an amount from 0.02 to 1.0% by mass in terms of aluminum nitride.