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:
Apr. 23, 2024
Filed:
Jan. 24, 2020
Applicant:
Pva Tepla Ag, Wettenberg, DE;
Inventor:
Andreas Muehe, Wetzlar, DE;
Assignee:
PVA TePla AG, Wettenberg, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B 15/14 (2006.01); C30B 15/20 (2006.01); C30B 15/30 (2006.01); C30B 29/06 (2006.01);
U.S. Cl.
CPC ...
C30B 15/203 (2013.01); C30B 15/14 (2013.01); C30B 15/30 (2013.01); C30B 29/06 (2013.01);
Abstract
A method for pulling a cylindrical crystal from a melt by a crystal pulling unit includes measuring an actual value of a diameter of the crystal at a surface of the melt, comparing the actual value with a setpoint value for the diameter of the crystal, and setting a height of the annular gap as a function of a deviation between the actual value and the setpoint value using a first controller which has a first readjustment time.