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. 17, 2016
Filed:
Jul. 13, 2007
Applicants:
Marcus Schaefer, Traunstein, DE;
Reiner Peach, Neuoetting, DE;
Hanns Wochner, Burghausen, DE;
Inventors:
Assignee:
Wacker Chemie AG, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B 29/06 (2006.01); B02C 21/00 (2006.01); B02C 23/08 (2006.01); C30B 15/00 (2006.01);
U.S. Cl.
CPC ...
C30B 29/06 (2013.01); B02C 21/00 (2013.01); B02C 23/08 (2013.01); C30B 15/00 (2013.01); B02C 2210/02 (2013.01);
Abstract
Polysilicon rods from the Siemens process are crushed into fragments and further processed to fragments having very low metal contamination in an economical manner by purposefully fabricating parts contacting the polysilicon from materials which cause high metal contamination, and removing the metal contamination by a cleaning bath or baths tailored to the particular metal contamination. By this process, economical materials previously scrupulously avoided, such as low alloy steel, can be used for crushers, conveyors, and other polysilicon-contacting parts of the crushing and classifying system.