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. 04, 2003
Filed:
Dec. 12, 2001
Applicant:
Inventors:
Katsuhiko Kemmochi, Vancouver, WA (US);
Robert Mosier, Vancouver, WA (US);
Paul Spencer, Stevenson, WA (US);
Assignee:
Heracus Shin-Estu America, Camas, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B 3/500 ;
U.S. Cl.
CPC ...
C30B 3/500 ;
Abstract
A silica glass crucible is disclosed comprising a barium-doped inner wall layer. The crucible is made by introducing into a rotating crucible mold bulk silica grain to form a bulky wall. After heating the interior of the mold to fuse the bulk silica grains, an inner silica grain, doped with barium, is introduced. The heat at least partially melts the inner silica grain, allowing it to fuse to the wall to form an inner layer. The inner layer of the crucible crystallizes when used in a CZ process, extending the operating life of the crucible.