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:
May. 04, 2004
Filed:
May. 06, 2003
Applicant:
Inventors:
Yoshihisa Suda, Gunma, JP;
Noboru Kanba, Gunma, JP;
Atsushi Sato, Gunma, JP;
Kunitaka Yamada, Gunma, JP;
Assignee:
Mitsubishi Pencil Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 3/44 ; H01B 1/04 ;
U.S. Cl.
CPC ...
H05B 3/44 ; H01B 1/04 ;
Abstract
A resistive heating element having high generation efficiency for far infrared rays and a comparatively high specific resistance while maintaining the strength required as a resistive heating element, is obtained by shaping a mixture of graphite powder, boron nitride and silicone rubber to a desired shape followed by firing by heating to 380° C. in an oxidizing atmosphere and then further firing by heating to 1100° C. in a nitrogen atmosphere.