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Takeshi Seki
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Musashino-shi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Optical node device, optical transport network system, optical path...
Patent number
12,207,030
Issue date
Jan 21, 2025
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wavelength cross connect device and wavelength cross connect method
Patent number
11,979,226
Issue date
May 7, 2024
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Cyclic wavelength band replacement device, multi-band transmission...
Patent number
11,824,583
Issue date
Nov 21, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wavelength cross connect device and cross connect connection method
Patent number
11,750,317
Issue date
Sep 5, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical branch insertion device and optical branch insertion method
Patent number
11,722,235
Issue date
Aug 8, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system and optical transmission method
Patent number
11,696,056
Issue date
Jul 4, 2023
Nippon Telegraph and Telephone Corporation
Hiroto Takechi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wavelength cross connect device, branch ratio variable method, and...
Patent number
11,677,489
Issue date
Jun 13, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Insertion/removal error prevention system
Patent number
11,525,971
Issue date
Dec 13, 2022
Nippon Telegraph and Telephone Corporation
Yuichiro Ikuma
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Optical transmission system and failure diagnosis method for optica...
Patent number
11,528,080
Issue date
Dec 13, 2022
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
OSNR spectrum estimation apparatus, OSNR spectrum estimation method...
Patent number
11,424,824
Issue date
Aug 23, 2022
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Plasma etching apparatus comprising a nozzle oscillating unit
Patent number
10,176,972
Issue date
Jan 8, 2019
Disco Corporation
Yoshio Watanabe
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Digital signal processing device
Patent number
9,749,061
Issue date
Aug 29, 2017
Nippon Telegraph and Telephone Corporation
Fukutaro Hamaoka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE, AND WAVELENGTH CROSS CONNECT METHOD
Publication number
20240422456
Publication date
Dec 19, 2024
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE, AND WAVELENGTH CROSS CONNECT METHOD
Publication number
20240373152
Publication date
Nov 7, 2024
Nippon Telegraph and Telephone Corporation
Hiroki KAWAHARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE, AND WAVELENGTH CROSS CONNECT METHOD
Publication number
20240284079
Publication date
Aug 22, 2024
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE, AND WAVELENGTH CROSS CONNECT METHOD
Publication number
20240283557
Publication date
Aug 22, 2024
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL PATH ROUTE DESIGN DEVICE AND OPTICAL PATH ROUTE DESIGN METHOD
Publication number
20240223925
Publication date
Jul 4, 2024
Nippon Telegraph and Telephone Corporation
Hiroki DATE
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
MULTIPATH INTERFERENCE ANALYSIS DEVICE AND MULTIPATH INTERFERENCE A...
Publication number
20240204873
Publication date
Jun 20, 2024
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE AND WAVELENGTH CROSS CONNECT METHOD
Publication number
20230275667
Publication date
Aug 31, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE, MULTIBAND TRANSMISSION SYSTEM, AND...
Publication number
20230275668
Publication date
Aug 31, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND DESIGN METHOD FOR OPTICALTRANSMISSI...
Publication number
20230268998
Publication date
Aug 24, 2023
Nippon Telegraph and Telephone Corporation
Kohei SAITO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL NODE DEVICE, OPTICAL TRANSPORT NETWORK SYSTEM, OPTICAL PATH...
Publication number
20230254611
Publication date
Aug 10, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
MULTI-CORE FIBER, OPTICAL TRANSMISSION SYSTEM, AND OPTICAL TRANSMIS...
Publication number
20230244025
Publication date
Aug 3, 2023
Nippon Telegraph and Telephone Corporation
Kenta HIROSE
G02 - OPTICS
Information
Patent Application
CYCLIC WAVELENGTH BAND REPLACEMENT DEVICE, MULTI-BAND TRANSMISSION...
Publication number
20230074213
Publication date
Mar 9, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE AND WAVELENGTH CROSS CONNECT METHOD
Publication number
20230067932
Publication date
Mar 2, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL AMPLIFIER, RECEIVER, OPTICAL TRANSMISSION SYSTEM, AND OPTIC...
Publication number
20220416897
Publication date
Dec 29, 2022
Nippon Telegraph and Telephone Corporation
Kohei Saito
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE AND CROSS CONNECT CONNECTION METHOD
Publication number
20220182167
Publication date
Jun 9, 2022
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE, BRANCH RATIO VARIABLE METHOD, AND...
Publication number
20220182168
Publication date
Jun 9, 2022
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL BRANCH INSERTION DEVICE AND OPTICAL BRANCH INSERTION METHOD
Publication number
20220149970
Publication date
May 12, 2022
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION METHOD
Publication number
20220046341
Publication date
Feb 10, 2022
Nippon Telegraph and Telephone Corporation
Hiroto TAKECHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND FAILURE DIAGNOSIS METHOD FOR OPTICA...
Publication number
20220021449
Publication date
Jan 20, 2022
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OSNR SPECTRUM ESTIMATION APPARATUS, OSNR SPECTRUM ESTIMATION METHOD...
Publication number
20210351842
Publication date
Nov 11, 2021
Nippon Telegraph and Telephone Corporation
Hiroki KAWAHARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
CLEANING BODY AND CLEANING DEVICE
Publication number
20210286173
Publication date
Sep 16, 2021
Nippon Telegraph and Telephone Corporation
Takafumi FUKATANI
C03 - GLASS MINERAL OR SLAG WOOL
Information
Patent Application
MISSING ALERT HANDLING SYSTEM AND MISSING ALERT HANDLING METHOD
Publication number
20210258203
Publication date
Aug 19, 2021
Nippon Telegraph and Telephone Corporation
Takeshi SEKI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
INSERTION/REMOVAL ERROR PREVENTION SYSTEM
Publication number
20210191056
Publication date
Jun 24, 2021
Nippon Telegraph and Telephone Corporation
Yuichiro IKUMA
G02 - OPTICS
Information
Patent Application
PLASMA ETCHING APPARATUS
Publication number
20160343544
Publication date
Nov 24, 2016
Disco Corporation
Yoshio Watanabe
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
DIGITAL SIGNAL PROCESSING DEVICE
Publication number
20150236796
Publication date
Aug 20, 2015
Nippon Telegraph and Telephone Corporation
Fukutaro Hamaoka
H04 - ELECTRIC COMMUNICATION TECHNIQUE