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:
Feb. 18, 2020
Filed:
Feb. 23, 2017
Applicant:
Wacker Chemie Ag, Munich, DE;
Inventor:
Simon Pedron, Burghausen, DE;
Assignee:
WACKER CHEMIE AG, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B 33/03 (2006.01); B01J 8/18 (2006.01); B01J 19/02 (2006.01);
U.S. Cl.
CPC ...
C01B 33/03 (2013.01); B01J 8/1827 (2013.01); B01J 8/1836 (2013.01); B01J 8/1872 (2013.01); B01J 19/02 (2013.01); B01J 2208/00168 (2013.01); B01J 2208/00495 (2013.01); B01J 2219/0213 (2013.01);
Abstract
Prolonged operation campaigns in a fluidized bed reactor for producing granular polysilicon by deposition of silicon onto silicon seed particles from a silicon-containing precursor gas is made possible by employing a silicon-coated reaction tube which is not insulated above a region of the fluidized bed and as a result has a lower temperature such that the ratio of the thickness of the silicon on the reactor tube adjoining the fluidized bed to the coating thickness over the total reactor tube is from 7:1 to 1.5 to 1 after production campaign of from 15 to 500 days.