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:
Jul. 30, 2013
Filed:
Sep. 02, 2009
Katsuhiko Kemmochi, Camas, WA (US);
Robert Joseph Coolich, North Bonneville, WA (US);
Michael Randall Fallows, Vancouver, WA (US);
Katsuhiko Kemmochi, Camas, WA (US);
Robert Joseph Coolich, North Bonneville, WA (US);
Michael Randall Fallows, Vancouver, WA (US);
Heraeus Shin-Etsu America, Inc., Camas, WA (US);
Abstract
During a CZ or similar process, a silica crucible is held in a graphite or similar susceptor while being heated to above between about 1580 and 1620 degrees C. Vents or grooves formed in at least one of the outer surface of the crucible and the inner surface of the susceptor permit gasses to vent upwardly and out from between the crucible and susceptor. This permits gas evolved from the crucible as a result of the heat to be vented rather than expanding between the crucible and susceptor thereby deforming the crucible.