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. 21, 2001
Filed:
Mar. 22, 1999
Applicant:
Inventors:
Burkhard Altekrüger, Alzenau, DE;
Joachim Aufreiter, Alzenau, DE;
Assignee:
Leybold Systems GmbH, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B 1/502 ;
U.S. Cl.
CPC ...
C30B 1/502 ;
Abstract
A crystal pulling unit for the production of a crystal block has a recharging tube (,), via which granulate (,) enters into a crucible (,) with a melt (,), located within a container (,). This recharging tube (,) has an annular space (,) between an inner wall (,) and an outer wall (,), which is open on the lower front side of the recharging tube (,) and is connected with the protective gas source (,) to supply protective gas. This protective gas cools the recharging tube (,) and around its outlet, forms a gas mist that prevents the entry of finer fractions of the charging material into the pulling space.