(19) | |
| (11) | EP 1 985 593 A3 |
(12) | EUROPEAN PATENT APPLICATION |
(88) | Date of publication A3: | | 19.11.2008 Bulletin 2008/47 |
(43) | Date of publication A2: | | 29.10.2008 Bulletin 2008/44 |
(22) | Date of filing: 07.10.2003 |
| (51) | International Patent Classification (IPC): |
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(84) | Designated Contracting States: | | DE FR |
(30) | Priority: | 09.10.2002 JP 2002295832
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(62) | Application number of the earlier application in accordance with Art. 76 EPC: | | 03022667.4 / 1408015 |
(71) | Applicant: Japan Super Quartz Corporation | | Akita City
Akita 010-0065 (JP) |
| (72) | Inventors: | | - Tsujimoto, Toshio
Akita-shi
Akita 010-0065 (JP) - Ishizuka, Hiroya
Akita-shi
Akita 010-0065 (JP) - Fumoto, Naotaka
Chiyoda-ku, Tokyo 100-005 (JP)
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(74) | Representative: HOFFMANN EITLE | | Patent- und Rechtsanwälte
Arabellastrasse 4 81925 München 81925 München (DE) |
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(54) | Quartz glass crucible, its process of manufacture and use |
(57) A coated quartz glass crucible is provided which comprises:
a quartz glass crucible;
a glass layer formed on at least a part of the outer and/or inner surface of the quartz glass crucible;
wherein the glass powder layer contains silica glass powder, the silica glass powder containing:
more than 20 weight % of fine silica particles having a particle size of less than 10 µm; and
coarse silica particles having a particle size of from 10 to 150 µm.