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. 03, 1999
Filed:
Dec. 11, 1997
Applicant:
Inventors:
Assignees:
Commissariat A L'Energie Atomique, Paris, FR;
Centre National D'Etudes Spatiales, Paris Cedex, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B / ;
U.S. Cl.
CPC ...
117 83 ; 117 81 ; 117206 ; 117219 ; 117223 ;
Abstract
The material of the crystal (2) formed by solidification is deposited in a crucible (1), whose wall is perforated by two ducts for the injection of pressure at different heights (6, 7). A differential pressure is created between the two ducts, the pressure of the lower duct (7) being higher by a value roughly equal to the hydrostatic pressure of the remaining liquid (3), so that a clearance (5) is spontaneously formed between the crystal (2) and the crucible (1) and problems caused by differential thermal contractions on cooling are avoided.