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. 18, 1992
Filed:
Jul. 11, 1990
Applicant:
Inventor:
Robert N Flagella, Ridgefield, WA (US);
Assignee:
Advanced Silicon Materials, Inc., Moses Lake, WA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423349 ; 422145 ; 422147 ; 423348 ; 427213 ;
Abstract
An improved fluidized bed reactor and a method for utilizing the fluidized bed reactor in the production of, for example, high purity polycrystalline silicon, by the pyrolysis of silane containing gas. The reactor being characterized by an entrainment zone located above a lower reaction zone. The entrainment zone having a cross-sectional area less than or equal to the cross-sectional area of the reaction zone and being capable of maintaining a fluidization gas velocity sufficient to entrain silicon powder particles, yet not sufficient to entrain silicon particles.