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:
Nov. 04, 1997
Filed:
Dec. 20, 1994
Ryusuke Ushikoshi, Tajima, JP;
Atsushi Sakon, Nagoya, JP;
Koichi Umemoto, Toyota, JP;
Yusuke Niiori, Inuyama, JP;
NGK Insulators, Ltd., , JP;
Abstract
A ceramic heater includes a substrate made of aluminum nitride, a resistive heating element buried in the substrate and made of a metal having a high melting point, and terminals electrically connected to the resistive heating element and buried in said substrate. The terminals are made of a metal having a high melting point and a coefficient of thermal expansion not smaller than that of the substrate. The metal of the resistive heating element has a coefficient of thermal expansion not smaller than that of the substrate. The coefficient of thermal expansion of each of the terminals and the resistive heating element is in a range from 5.0.times.10.sup.-6 /.degree.C. to 8.3.times.10.sup.-6 /.degree.C.