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Photomask blank and photomask
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Patent number 6,727,027
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Issue date Apr 27, 2004
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Shin-Etsu Chemical Co., Ltd.
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Tetsushi Tsukamoto
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Phase shift mask and method of manufacture
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Patent number 6,514,642
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Issue date Feb 4, 2003
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Shin-Etsu Chemical Co., Ltd.
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Satoshi Okazaki
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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Phase shift mask and making process
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Patent number 6,352,801
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Issue date Mar 5, 2002
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Shin-Etsu Chemical Co., Ltd.
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Satoshi Okazaki
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY