Toshiki Shojima

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Chiba, JP

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Patents Grantslast 30 patents

Information Patent Grant
Apparatus for manufacturing an optical disk substrate by injection...
- Patent number 5,156,860
- Issue date Oct 20, 1992
- Idemitsu Petrochemical Co., Ltd.
- Kotaro Kojima
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Optical disk substrate, optical information-storage medium, and pro...
- Patent number 5,059,461
- Issue date Oct 22, 1991
- Idemitsu Petrochemical Co., Ltd.
- Kotaro Kojima
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL