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. 11, 2006
Filed:
May. 16, 2003
Yasuo Ohama, Takefu, JP;
Takayuki Togawa, Takefu, JP;
Yasuo Ohama, Takefu, JP;
Takayuki Togawa, Takefu, JP;
Heraeus Quarzglas GmbH & Co. KG, Hanau, DE;
Shin-Etsu Quartz Products Co., Ltd., Tokyo, JP;
Abstract
It is an object of the present invention to provide a hydrogen-doped silica powder that is useful in the formation of a quartz glass crucible that is capable of pulling a silicon single crystal without causing a state having dislocations in the silicon single crystal due to peeling of quartz glass segment. It is a further object of the invention to provide a quartz glass crucible for use in pulling a silicon single crystal whose inner surface is formed by use of the hydrogen-doped silica powder and a producing method of the silica powder. In order to achieve the objects above, the present invention provides a hydrogen-doped silica powder for use in producing a quartz glass crucible for use in pulling a silicon single crystal, wherein the silica powder is made of synthetic silica powder, natural silica powder or a mixture thereof, with a hydrogen concentration being in the range of 1×10to 5×10molecules/cm, and a producing method thereof, and a quartz glass crucible for pulling a silicon single crystal whose inner surface is made of the silica powders.