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:
Jun. 15, 2010
Filed:
Jun. 18, 2007
Applicants:
Hanns Wochner, Burghausen, DE;
Christian Gossmann, Emmerting, DE;
Herbert Lindner, Ostermiething, AT;
Inventors:
Hanns Wochner, Burghausen, DE;
Christian Gossmann, Emmerting, DE;
Herbert Lindner, Ostermiething, AT;
Assignee:
Wacker Chemie AG, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23G 1/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to a method for cleaning polycrystalline silicon fragments to a metal content of <100 ppbw, wherein a polysilicon fraction is added to an aqueous cleaning solution containing HF and HO, this aqueous cleaning solution is removed and the polycrystalline fraction thereby obtained is washed with highly pure water and subsequently dried.