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:
Aug. 09, 1977
Filed:
Apr. 09, 1976
Takeshi Yamaguchi, Tokyo, JA;
Other;
Abstract
A fluid-permeable electrically energized heat generating member of a desired shape, such as a rectangular brick, is formed by (1) mixing (a) about 87 to 94% by weight of a first material which contains about 80 to 95% by weight of SiC and about 5 to 20% by weight of a mixture of carbonyl iron, nickel-chromium alloy, cobalt and carbon; (b) about 5 to 10% by weight of a second material which contains about 75 to 95% by weight of an organic binder material, such as a linseed oil and about 5 to 25% by weight of a foaming material, such as methylene diphenyl isocyanate; and (c) about 0.2 to 3% by weight of a third material selected from the group consisting of polystyrene preformed powder, sawdust, wood flour, starch, corn flour and mixtures thereof; (2) placing the resultant mixture in a select mold and subjecting the mold to curing conditions sufficient to provide self-sustaining members composed of the foregoing mixture; (3) removing the self-sustaining members from the molds and subjecting them to a heat at a temperature in the range of about 250.degree. to 350.degree. F. for a period of time sufficient to render the bodies electrically conductive; (4) sintering the electrically conductive bodies as by passing a controlled electrical current through each member until a temperature in the range of about 1000.degree. to 1600.degree. F. is achieved within the member; and (5) metallizing terminal sides of each member, as by applying an aluminum layer thereon for contact with a suitable electrical circuit.