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:
Jan. 10, 1989
Filed:
Dec. 10, 1986
Rolf Berthelius, Vaster.ang.s, SE;
Tommy Fredriksson, Hallstahammar, SE;
Kanthal AB, Hallstahammar, SE;
Abstract
A foil element for the electric heating of objects comprises a resistance heating coil placed between insulating plastic foils and a sensor coil placed between the plastic foils beside the heating coil. The sensor and heating coils are formed of the same metallic material. The sensor coil is spaced sufficiently far from the heating coil to assure that the sensor coil is heated mainly by heat flowing to or from the object being heated and only slightly by heat directly from the heating coil. The electric resistance of the sensor coil is sensed to determine the temperature thereof. The heating coil is controlled in accordance with the temperature of the sensor coil.