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Keiji Hashimoto
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Tokyo, JP
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last 30 patents
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Patent Grant
Blanks for halftone phase shift photomasks, halftone phase shift ph...
Patent number
5,721,075
Issue date
Feb 24, 1998
Dai Nippon Printing Co., Ltd.
Keiji Hashimoto
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Blanks for halftone phase shift photomasks, halftone phase shift ph...
Patent number
5,614,335
Issue date
Mar 25, 1997
Dai Nippon Printing Co., Ltd.
Keiji Hashimoto
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Halftone phase shift photomask, halftone phase shift photomask blan...
Patent number
5,538,816
Issue date
Jul 23, 1996
Dai Nippon Printing Co., Ltd.
Keiji Hashimoto
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Photomask blank and phase shift photomask
Patent number
5,419,988
Issue date
May 30, 1995
Dai Nippon Printing Co., Ltd.
Hiroshi Mohri
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY