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. 23, 2002
Filed:
Jan. 31, 2001
Shinji Yamaguchi, Aichi Pref., JP;
Atsuo Yamada, Yokohama., JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
A heating apparatus for preventing increase of the temperature difference on the heating surfaces and occurrence of heat spots in a broad temperature range including a high temperature region includes a substrate made of a ceramic material with a heating surface A, a plurality of resistance-heating elements and buried in said substance pairs of terminals and each pair of the terminals and being attached to a respective one of the resistance-heating elements to supply alternating current there to, and AC power sources A and B each connected to respective one of said pairs of the terminals and for the respective resistance-heating elements to supply the alternating current thereto. Insulating transformers A and B each are interposed between the respective AC power source and the pair of the terminals.