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:
Jun. 28, 1983
Filed:
Oct. 30, 1981
Ibigawa Electric Industry Co. Ltd., Gifu, JP;
Abstract
.beta.-type silicon carbide having exceedingly high purity is stably and continuously produced in an apparatus comprising a vertical type reaction vessel having an inlet, a preheating zone, a heating zone, a cooling zone and a closable outlet which are sequentially communicated in this order in vertical direction, and a heat insulating layer composed essentially of fine powders of graphite and carbonaceous materials arranged on at least outside of the heating zone, the heating zone of the reaction vessel being made of graphite and having a heating means to indirectly and electrically heat charged materials, the preheating zone having a horizontal cross-sectional area larger than that of the heating zone at any level above an arbitrary position of the preheating zone.