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. 26, 1987
Filed:
Aug. 16, 1985
Jack H Smuckler, Marblehead, MA (US);
Belton Corporation, Belton, SC (US);
Abstract
Disclosed is an improved temperature self-regulating resistive heating element and a method for its fabrication. The element utilizes a positive temperature coefficient (PTC) composition comprising a blend of two partially incompatible crystalline polymers of differing melting points and an electrically conductive filler. The PTC composition does not deform during annealing, this permitting the fabrication of temperature self-regulating resistive heating element with electrodes spaced-apart by not more than 0.100 inch. Heating elements provided by the invention have a smaller cross section, are more flexible, and are less expensive to fabricate than similar prior art elements.