Hirotomo Hirai

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Tokyo, JA

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Patents Grantslast 30 patents

Information Patent Grant
Liquid crystal display device
- Patent number 4,017,155
- Issue date Apr 12, 1977
- Kabushiki Kaisha Daini Seikosha
- Kenjiro Yagi
- G02 - OPTICS
Information Patent Grant
Reflective plates for a liquid crystal display device
- Patent number 3,984,176
- Issue date Oct 5, 1976
- Kabushiki Kaisha Daini Seikosha
- Hirotomo Hirai
- G02 - OPTICS
Information Patent Grant
Switching system for an electronic timepiece
- Patent number 3,978,296
- Issue date Aug 31, 1976
- Kabushiki Kaisha Daini Seikosha
- Tokio Moriya
- H01 - BASIC ELECTRIC ELEMENTS