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:
Nov. 10, 1992
Filed:
Dec. 11, 1990
Applicant:
Inventor:
Farzin H Azad, Clifton Park, NY (US);
Assignee:
General Electric Company, Schenectady, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C30B / ;
U.S. Cl.
CPC ...
1566191 ; 156601 ; 1566171 ; 1566181 ; 422246 ; 422249 ;
Abstract
An apparatus and method for control of a shape of a solidification interface in a Czochralski crystal pulling process are provided wherein a bottom heater is disposed below the bottom of the crucible, the bottom heater having a plurality of individually controllable heating elements which are selectively controlled to produce a desired radial temperature distribution across the bottom of the crucible, thereby influencing the flow pattern within the melt.