Tsuyoshi Hayakawa

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Three hands type clock with belt drive
- Patent number 5,105,398
- Issue date Apr 14, 1992
- Seikosha Co., Ltd.
- Tsuyoshi Hayakawa
- G04 - HOROLOGY
Information Patent Grant
Circuit unit for timepiece and process for fabricating the same
- Patent number 4,796,239
- Issue date Jan 3, 1989
- Seikosha Co., Ltd.
- Tsuyoshi Hayakawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Method of connecting coil
- Patent number 4,745,682
- Issue date May 24, 1988
- Seikosha Co,, Ltd.
- Tsuyoshi Hayakawa
- H01 - BASIC ELECTRIC ELEMENTS