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:
Dec. 27, 1983
Filed:
Jun. 28, 1982
Applicant:
Inventors:
Michael P Murphy, Flint, MI (US);
Gary F Stack, Grand Blanc, MI (US);
James W Hoppenrath, Flint, MI (US);
John R Taylor, Lapeer, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F23Q / ;
U.S. Cl.
CPC ...
219270 ; 1231 / ; 219260 ; 361266 ; 338218 ; 338239 ;
Abstract
A sheathed electric heater especially of the type used as diesel engine glow plugs has a dual coil heating element including separate tip heater and PTC body control coils thermally isolated by a low resistance connector section made from interengaging small diameter coiled connector portions integral with the tip and body coils and preferably welded together. Preferred material and dimensional specifications and pertinent design considerations are also included.