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:
Oct. 10, 2006
Filed:
Jul. 16, 2001
Katsuhiko Kemmochi, Vancouver, WA (US);
Robert O. Mosier, Vancouver, WA (US);
Paul G. Spencer, Stevenson, WA (US);
Katsuhiko Kemmochi, Vancouver, WA (US);
Robert O. Mosier, Vancouver, WA (US);
Paul G. Spencer, Stevenson, WA (US);
Heraeus Shin-Etsu America, Camas, WA (US);
Abstract
A silica glass crucible is manufactured by introducing into a rotating crucible mold bulk silica grain to form a bulky wall including a bottom wall and a side wall. After heating the interior of the mold to begin to fuse the bulk silica grains, an inner silica grain, doped with aluminum, 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 crucible is cooled, the fused silica grains forming nuclei of crystalline silica within the inner layer.