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:
Sep. 20, 1977
Filed:
Apr. 14, 1975
Joseph F Wenckus, Needham, MA (US);
Wilson P Menashi, Lexington, MA (US);
Roger A Castonguay, Salem, MA (US);
Arthur D. Little, Inc., Cambridge, MA (US);
Abstract
A cold crucible system is provided which is suitable for carrying out the process of 'skull' melting wherein highly refractory materials are melted by inductive heating in a manner to maintain the molten material in a shell of the material cool enough to act as a crucible. The cold crucible system incorporates a crucible formed as two separate halves held in a manner to define a narrow electrically insulating space between them. Each half section comprises a plurality of copper tubes forming half of a 'cage.' Each tube of the cage has a concentric smaller tube therein whereby there are defined in each tube an outer annular and a central inner fluid passage through which a fluid coolant is circulated. The system is formed as a module capable of being located within a controlled atmosphere chamber. The crucible system is readily adapted to Czochralski crystal growth, for use with a seed crystal to induce directional crystal growth by the Bridgeman technique and to centrifugal casting.