US Patent 7247817 Ceramic heater having a resistance heater element

Patent 7247817 was granted and assigned to NGK Insulators on July, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

NGK Insulators

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7247817

Date of Patent

July 24, 2007

Patent Application Number

10657806

Date Filed

September 8, 2003

Patent Primary Examiner

‌

Sang Paik

Patent abstract

A heater is provided including a plate having a heating surface for heating an object to be heated and a resistance heater element provided in the plate. This resistance heater element includes a continuous wiring pattern including a plurality of flexures and a thermal uniform pattern part which improves thermal uniformity. The continuous wiring pattern includes a plurality of folding parts as the flexures. A first distance between the wirings in a first region of the wiring pattern other than a second region proximate the folding parts is substantially constant, and a second distance between the wirings in the second region is greater than the first distance.