Katsuyoshi Kumagai

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Yamagata, JP

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Patents Grantslast 30 patents

Information Patent Grant
Diaphragm for use in electro-acoustic transducer
- Patent number 4,674,592
- Issue date Jun 23, 1987
- Alpine Electronics Inc.
- Shuichi Aoki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Flame-retarded acoustic diaphragm
- Patent number 4,451,609
- Issue date May 29, 1984
- Pioneer Electronic Corporation
- Fumio Kawahara
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE