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Takahiro Numai
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Tokyo, JP
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last 30 patents
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Patent Grant
Surface-emitting semiconductor device
Patent number
5,469,458
Issue date
Nov 21, 1995
NEC Corporation
Takahiro Numai
B82 - NANO-TECHNOLOGY
Information
Patent Grant
Optical switching system for optical wavelength-division and time-d...
Patent number
5,404,240
Issue date
Apr 4, 1995
NEC Corporation
Makoto Nishio
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Driving method and apparatus for a pnpn semiconductor device
Patent number
5,153,758
Issue date
Oct 6, 1992
NEC Corporation
Yoshiharu Tashiro
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Optical filter device
Patent number
5,084,897
Issue date
Jan 28, 1992
NEC Corporation
Takahiro Numai
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Tunable wavelength filter
Patent number
4,976,513
Issue date
Dec 11, 1990
NEC Corporation
Takahiro Numai
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Optical filter device
Patent number
4,899,361
Issue date
Feb 6, 1990
NEC Corporation
Takahiro Numai
H01 - BASIC ELECTRIC ELEMENTS