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. 07, 1976
Filed:
Nov. 29, 1974
Michael L Bouffard, Pawtucket, RI (US);
John L Grant, Mansfield, MA (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An electrical heater device includes a disc-like ceramic resistor element of a material of positive temperature coefficient of resistivity having contact surfaces formed on a broad opposite sides of the element. A pair of device terminals engage respective contact surfaces of the resistor element for directing electrical current through the element. At least one of the terminals has a plurality of protuberances resiliently engaged with a limited area of one contact surface of the resistor element to provide good electrical connection to the element in a convenient manner. In addition, an inert silicone material having a metallic particulate dispersed therein is disposed between the terminal and the remaining area of the contact surface of the resistor element to maximize heat transfer from the element to the terminal so that heat generated by the resistor element is efficiently emitted from the heater device.