Shosen Sato

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Hanamaki, JP

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Patents Grantslast 30 patents

Information Patent Grant
Gradation mask method of producing the same and method of forming s...
- Patent number 5,830,605
- Issue date Nov 3, 1998
- Ricoh Optical Industries Co., Ltd.
- Kazuhiro Umeki
- G02 - OPTICS
Information Patent Grant
Exposure mask, method of producing the same, exposure mask producin...
- Patent number 5,776,639
- Issue date Jul 7, 1998
- Ricoh Optical Industries, Co., Ltd.
- Kazuhiro Umeki
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY