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. 26, 2005
Filed:
Mar. 06, 2002
Kimie Kato, Ama-gun, JP;
Takeya Miyashita, Kasugai, JP;
Kimie Kato, Ama-gun, JP;
Takeya Miyashita, Kasugai, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
Temperature of a heater is controlled by switching an increasing rate of a resistance value of heating unit of the heater. During a period Tfrom a time point when heating of the heater is started until the resistance value of the heating unit reaches a reference value, the increasing rate is changed in multiple heating stages. In this manner, the temperature and the resistance value of the heating unit are increased. During a period Tfrom a time point when the resistance value of the heating unit reaches the reference value, feedback control is performed such that the resistance value is kept at the reference value as a target value.