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. 25, 1978
Filed:
Dec. 17, 1976
Applicant:
Inventors:
Robert M Griffin, South Hamilton, MA (US);
Max E Oberlin, Lynn, MA (US);
Robert P Bonazoli, Hamilton, MA (US);
Assignee:
GTE Sylvania Incorporated, Danvers, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01C / ;
U.S. Cl.
CPC ...
338237 ; 13 25 ; 219354 ; 219553 ; 338234 ; 338318 ;
Abstract
An electrical heating element for ovens, furnaces and other infrared light applications comprises an elongate tubular envelope of thermally translucent refractory material such as pure alumina enclosing an elongate coiled refractory metal conductor which is capable of carrying a linear power loading of at least one hundred watts per inch. Refractory spacers along the coiled conductor and envelope hold the conductor spaced from the envelope and coaxial therewith so that the conductor attains heat in excess of the temperature limit of the envelope.