Yoshiaki Arai

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Yokohama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Positive-working photosensitive quinone diazide composition with al...
- Patent number 4,882,260
- Issue date Nov 21, 1989
- Tokyo Ohka Kogyo Co., Ltd.
- Hidekatsu Kohara
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Positive-working naphthoquinone diazide photoresist composition wit...
- Patent number 4,731,319
- Issue date Mar 15, 1988
- Tokyo Ohka Kogy Co., Ltd.
- Hidekatsu Kohara
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY