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. 30, 1977
Filed:
Jul. 06, 1976
Wolfgang Keller, Munich, DT;
Siemens Aktiengesellschaft, Berlin & Munich, DT;
Abstract
Stock semiconductor crystal rods are zone melt refined by positioning such stock rods in a zone melt environment with a seed crystal attached to a lower end thereof, generating a melt zone at the juncture of the seed crystal and stock rod and controllably moving the melt zone away from the juncture and through the stock rod to a select point thereon, uniformly supporting the cone-shaped lower portion of the rod being refined from below the juncture to an area adjacent the select point so as to prevent vibrations and the like within the rod being processed, applying a controlled electrical current across the melt zone from the ends of the rod being refined and controllably moving the melt zone from the select point through the remainder of the rod. The uniform support is provided by a movable electrically conductive funnel-shaped jacket filled with an electrically conductive stabilizing means, such as metal spheroids or particulate silicon particles, molten metal, etc. and the electrical leads are connected to such jacket and to an upper rod support member whereby electrical current is fed from one end of the rod to the other.