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:
Jul. 24, 1979
Filed:
Jul. 10, 1978
Friedrich Ticak, Munich, DE;
Hans Stut, Grobenzell, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
Method of crucible-free zone-melting a semiconductor rod which includes monitoring a melting zone formed in and traveling through a semiconductor rod surrounded by an induction heating coil, producing a respective signal corresponding to values of the actual diameters d of the semiconductor rod at a crystallization interface of the melting zone, comparing the signals corresponding to the actual diameter values d with a signal corresponding to a nominal diameter value d.sub.s so as to produce a signal corresponding to a respective first control deviation .DELTA.d, continuously combining the signals corresponding to the actual diameter values d and the signal corresponding to the respective first control deviation .DELTA.d to form respective signals corresponding to a new nominal diameter value d.sub.s *, respectively, in accordance with the relationships: