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:
Mar. 13, 1984
Filed:
Feb. 03, 1981
Wolfgang Keller, Munich, DE;
Gerhard Schrotter, Neufahrn, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
Method of setting a stable melting zone in a semiconductor crystalline rod during crucible-free zone melting thereof, by means of a single-winding induction heating coil having an inner diameter smaller than the diameter of a portion of the rod being fed to the melting zone which includes performing the crucible-free zone melting in an argon atmosphere at an overpressure in vicinity of at least 1.5 ata and maximally 6 ata, and setting the outer melting-zone height at a value of between 15 and 23 mm for a diameter of the recrystallized rod portion within a range of 30 to 50 mm, at a value of between 18 and 26 mm for a diameter of the recrystallized rod portion within a range of 50 to 75 mm and at a limiting value of 32 mm for a rod diameter greater than 75 mm.