Ryoji Takeyari

Person

Koganei, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Optical transmission system constructing method and system
- Patent number 7,292,785
- Issue date Nov 6, 2007
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical transmission system constructing method and system
- Patent number 7,167,652
- Issue date Jan 23, 2007
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical frequency division multiplexing network
- Patent number 7,127,170
- Issue date Oct 24, 2006
- Hitachi, Ltd.
- Atsushi Takai
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical transmitter
- Patent number 7,099,596
- Issue date Aug 29, 2006
- Hitachi, Ltd.
- Koichi Watanabe
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical transmitter equipment and semiconductor laser device
- Patent number 6,931,039
- Issue date Aug 16, 2005
- Hitachi, Ltd.
- Kouji Nakahara
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical single sideband transmitter
- Patent number 6,850,713
- Issue date Feb 1, 2005
- Hitachi, Ltd.
- Nobuhiko Kikuchi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical transmission system constructing method and system
- Patent number 6,728,489
- Issue date Apr 27, 2004
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical receiver
- Patent number 6,658,217
- Issue date Dec 2, 2003
- Hitachi, Ltd.
- Kenichi Ohhata
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical frequency division multiplexing network
- Patent number 6,619,865
- Issue date Sep 16, 2003
- Hitachi, Ltd.
- Atsushi Takai
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Band-expanding method for optical amplifiers and optical transmissi...
- Patent number 6,587,260
- Issue date Jul 1, 2003
- Hitachi, Ltd.
- Nobuhiko Kikuchi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical receiver
- Patent number 6,304,357
- Issue date Oct 16, 2001
- Hitachi, Ltd.
- Kenichi Ohhata
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical transmission equipment which transmits an amplified optical...
- Patent number 6,266,169
- Issue date Jul 24, 2001
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical transmission equipment which transmits an amplified optical...
- Patent number 6,018,405
- Issue date Jan 25, 2000
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical wavelength multiplexing system
- Patent number 6,005,699
- Issue date Dec 21, 1999
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical repeater and optical transmitter
- Patent number 5,875,046
- Issue date Feb 23, 1999
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical multiplex transmission equipment and method
- Patent number 5,861,972
- Issue date Jan 19, 1999
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Feedback type pre-amplifier
- Patent number 5,844,445
- Issue date Dec 1, 1998
- Hitachi, Ltd.
- Ryoji Takeyari
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Optical regenerator and an optical transmission system
- Patent number 5,838,475
- Issue date Nov 17, 1998
- Hitachi, Ltd.
- Ryoji Takeyari
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical repeater and optical transmitter
- Patent number 5,812,289
- Issue date Sep 22, 1998
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical frequency division multiplexing network
- Patent number 5,801,864
- Issue date Sep 1, 1998
- Hitachi, Ltd.
- Atsushi Takai
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical transmission system constructing method and system
- Patent number 5,739,932
- Issue date Apr 14, 1998
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Multicast communications method
- Patent number 5,612,959
- Issue date Mar 18, 1997
- Hitachi, Ltd.
- Akihiko Takase
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical regenerator and an optical transmission system
- Patent number 5,576,876
- Issue date Nov 19, 1996
- Hitachi, Ltd.
- Ryoji Takeyari
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical transmission system constructing method and system
- Patent number 5,555,477
- Issue date Sep 10, 1996
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical frequency division multiplexing network
- Patent number 5,510,921
- Issue date Apr 23, 1996
- Hitachi, Ltd.
- Atsushi Takai
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Star type multi-stage network
- Patent number 5,506,711
- Issue date Apr 9, 1996
- Hitachi, Ltd.
- Ryoji Takeyari
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical routing system
- Patent number 5,438,444
- Issue date Aug 1, 1995
- Hitachi, Ltd.
- Takashi Tayonaka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Homodyne optical receiver equipment
- Patent number 5,323,258
- Issue date Jun 21, 1994
- Hitachi, Ltd.
- Hideaki Tsushima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical frequency division multiplexing network
- Patent number 5,321,540
- Issue date Jun 14, 1994
- Hitachi, Ltd.
- Atsushi Takai
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Polarization diversity optical receiving apparatus and method
- Patent number 5,142,402
- Issue date Aug 25, 1992
- Hitachi, Ltd.
- Hideaki Tsushima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Optical transmission system constructing method and system
- Publication number 20070053687
- Publication date Mar 8, 2007
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical frequency division multiplexing network
- Publication number 20050175351
- Publication date Aug 11, 2005
- Hitachi, Ltd.
- Atsushi Takai
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Wavelength-multiplexed narrow-bandwidth optical transmitter and wav...
- Publication number 20040208428
- Publication date Oct 21, 2004
- Nobuhiko Kikuchi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical transmission system constructing method and system
- Publication number 20040161189
- Publication date Aug 19, 2004
- Hitachi, Ltd.
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical transmitter equipment and semiconductor laser device
- Publication number 20040028100
- Publication date Feb 12, 2004
- Hitachi, Ltd.
- Kouji Nakahara
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Optical single sideband transmitter
- Publication number 20030189745
- Publication date Oct 9, 2003
- Nobuhiko Kikuchi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical transmitter
- Publication number 20030180054
- Publication date Sep 25, 2003
- Koichi Watanabe
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Band-expanding method for optical amplifiers and optical transmissi...
- Publication number 20020145796
- Publication date Oct 10, 2002
- Nobuhiko Kikuchi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Clock producing circuit and semiconductor integrated circuit for co...
- Publication number 20020031148
- Publication date Mar 14, 2002
- Keiki Watanabe
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Application
Optical transmission system constructing method and system
- Publication number 20020024699
- Publication date Feb 28, 2002
- Hitachi, Ltd
- Keiji Tomooka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical receiver
- Publication number 20020005974
- Publication date Jan 17, 2002
- Hitachi, Ltd.
- Kenichi Ohhata
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Ryoji Takeyari

Person

Patents Grantslast 30 patents

Optical transmission system constructing method and system

Optical transmission system constructing method and system

Optical frequency division multiplexing network

Optical transmitter

Optical transmitter equipment and semiconductor laser device

Optical single sideband transmitter

Optical transmission system constructing method and system

Optical receiver

Optical frequency division multiplexing network

Band-expanding method for optical amplifiers and optical transmissi...

Optical receiver

Optical transmission equipment which transmits an amplified optical...

Optical transmission equipment which transmits an amplified optical...

Optical wavelength multiplexing system

Optical repeater and optical transmitter

Optical multiplex transmission equipment and method

Feedback type pre-amplifier

Optical regenerator and an optical transmission system

Optical repeater and optical transmitter

Optical frequency division multiplexing network

Optical transmission system constructing method and system

Multicast communications method

Optical regenerator and an optical transmission system

Optical transmission system constructing method and system

Optical frequency division multiplexing network

Star type multi-stage network

Optical routing system

Homodyne optical receiver equipment

Optical frequency division multiplexing network

Polarization diversity optical receiving apparatus and method

Patents Applicationslast 30 patents

Optical transmission system constructing method and system

Optical frequency division multiplexing network

Wavelength-multiplexed narrow-bandwidth optical transmitter and wav...

Optical transmission system constructing method and system

Optical transmitter equipment and semiconductor laser device

Optical single sideband transmitter

Optical transmitter

Band-expanding method for optical amplifiers and optical transmissi...

Clock producing circuit and semiconductor integrated circuit for co...

Optical transmission system constructing method and system

Optical receiver