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Yoshihiko Masakawa
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Hachioji, JP
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last 30 patents
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Patent Grant
Optical information recording and/or reproducing apparatus
Patent number
5,155,719
Issue date
Oct 13, 1992
Olympus Optical Co., Ltd.
Yoshihiko Masakawa
G11 - INFORMATION STORAGE
Information
Patent Grant
Method and apparatus for detecting and measuring the refractive ind...
Patent number
5,028,774
Issue date
Jul 2, 1991
Olympus Optical Co., Ltd.
Akihiko Yoshizawa
G01 - MEASURING TESTING
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Patent Grant
Method of recording bivalent signals on opto-magnetic record medium
Patent number
4,926,402
Issue date
May 15, 1990
Olympus Optical Co., Ltd.
Yoshihiko Masakawa
G11 - INFORMATION STORAGE