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. 18, 1984
Filed:
Oct. 09, 1981
Shigetaka Wada, Kuwana, JP;
Toshio Yamada, Nagoya, JP;
NGK Insulators, Ltd., , JP;
Abstract
An apparatus for heating the fuel mixture of an internal combustion engine includes a cylindrical heating body, adapted to form a passageway between a fuel supply and an internal combustion engine, having a double walled structure formed by spaced inner and outer metallic cylinders. A plurality of plate-like ceramic heating elements having a positive temperature coefficient (PTC) of electrical resistance are inserted between the inner and outer cylinders and are urged into contact with the inner cylinder by a resilient spring member. The cylindrical heating body is sealed by welding, brazing, caulking or packing to form a gas-tight chamber enclosing the ceramic heating elements and isolating them from degradation by the fuel mixture. The cylindrical body is provided with an air hole communicating the chamber with an ambient air vent passage formed in an insulator member attached to the body thereby connecting the interior of the chamber and the ceramic heating elements therein to an external air supply.