Akio Ohishi

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Patents Grantslast 30 patents

Information Patent Grant
Optical device diffraction gratings and a photomask for use in the...
- Patent number 5,340,637
- Issue date Aug 23, 1994
- Hitachi, Ltd.
- Makoto Okai
- G02 - OPTICS
Information Patent Grant
System having a function of reproducing optical information
- Patent number 5,034,942
- Issue date Jul 23, 1991
- Hitachi, Ltd.
- Akio Ohishi
- G11 - INFORMATION STORAGE
Information Patent Grant
Semiconductor devices
- Patent number 4,905,057
- Issue date Feb 27, 1990
- Hitachi, Ltd.
- Akio Ohishi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Semiconductor laser device
- Patent number 4,841,531
- Issue date Jun 20, 1989
- Hitachi, Ltd.
- Masahiko Kondow
- B82 - NANO-TECHNOLOGY
Information Patent Grant
Semiconductor device
- Patent number 4,819,036
- Issue date Apr 4, 1989
- Hitachi, Ltd.
- Takao Kuroda
- B82 - NANO-TECHNOLOGY