Keizo Ishiwatari

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Kobe, JP

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Patents Grantslast 30 patents

Information Patent Grant
Magnetic erasing head
- Patent number 4,613,919
- Issue date Sep 23, 1986
- Matsushita Electric Industrial Co., Ltd.
- Norio Miyatake
- G11 - INFORMATION STORAGE
Information Patent Grant
Method of making metal coated foil speaker diaphragm
- Patent number 4,470,479
- Issue date Sep 11, 1984
- Matsushita Electric Industrial Co., Ltd.
- Hideaki Inoue
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Method for manufacturing magnetic head using boronizing treatment
- Patent number 4,251,297
- Issue date Feb 17, 1981
- Matsushita Electric Industrial Co., Ltd.
- Hidetsugu Kawabata
- G11 - INFORMATION STORAGE
Information Patent Grant
Composite diaphragm for speaker
- Patent number 4,216,271
- Issue date Aug 5, 1980
- Matsushita Electric Industrial Co., Ltd.
- Hiroshi Takeuchi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE