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. 11, 1980
Filed:
Oct. 30, 1978
Applicant:
Inventor:
Walter Schmidt, Schaffhausen, CH;
Assignee:
Swiss Aluminium Ltd., Chippis, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ;
U.S. Cl.
CPC ...
422249 ; 1566 / ; 156D / ;
Abstract
Iridium from the crucible wall, taken into solution during the growth of crystals by the Czochralski technique, is trapped at the bottom of the iridium crucible by cooling at least the bottom of the crucible. This part of the crucible is cooled to a temperature above the solidification temperature of the melt and results in almost inclusion-free crystals.