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:
May. 15, 2001
Filed:
Mar. 22, 1999
Applicant:
Inventors:
Burkhard Altekrüger, Alzenau, DE;
Joachim Aufreiter, Alzenau, DE;
Assignee:
Leybold Systems GmbH, Hanau, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B 3/500 ;
U.S. Cl.
CPC ...
C30B 3/500 ;
Abstract
A crystal pulling unit for the production of a crystal block has a recharging tube (,), via which granulate (,) is introduced into a crucible (,) with a melt (,), located inside a container (,). A fine-dust separator (,) is located in the recharging tube (,) outside the container (,); the separator works like an air classifier and, by means of a protective gas cushion, removes fine dusts from the granulate (,). This counters the danger of clogging of the recharging tube (,) by the caking of the recharging material.