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Masahiro Nakagawa
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Musashino-shi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Transmission device, time transmission system, and delay compensati...
Patent number
11,855,760
Issue date
Dec 26, 2023
Nippon Telegraph and Telephone Corporation
Masahiro Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Transmission device, time transmission system, and delay compensati...
Patent number
11,791,922
Issue date
Oct 17, 2023
Nippon Telegraph and Telephone Corporation
Masahiro Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical branch insertion device and optical transmission system usi...
Patent number
11,757,554
Issue date
Sep 12, 2023
Nippon Telegraph and Telephone Corporation
Masahiro Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Time transmission device and transmission method
Patent number
11,750,358
Issue date
Sep 5, 2023
Nippon Telegraph and Telephone Corporation
Masahiro Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical branch insertion device and optical transmission system usi...
Patent number
11,742,976
Issue date
Aug 29, 2023
Nippon Telegraph and Telephone Corporation
Masahiro Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Time synchronization path selection device and time synchronization...
Patent number
11,722,288
Issue date
Aug 8, 2023
Nippon Telegraph and Telephone Corporation
Kaoru Arai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical demultiplexer, optical separation device, optical transmiss...
Patent number
11,652,563
Issue date
May 16, 2023
Nippon Telegraph and Telephone Corporation
Kana Masumoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Time comparison device and time quality monitoring method
Patent number
11,638,228
Issue date
Apr 25, 2023
Nippon Telegraph and Telephone Corporation
Kaoru Arai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Transmission device, time transmission system, and delay measuremen...
Patent number
11,438,857
Issue date
Sep 6, 2022
Nippon Telegraph and Telephone Corporation
Kaoru Arai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Dispersion compensation system and dispersion compensation method
Patent number
11,251,868
Issue date
Feb 15, 2022
Nippon Telegraph and Telephone Corporation
Kana Masumoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical network system, optical switch node, master node, and node
Patent number
9,883,262
Issue date
Jan 30, 2018
Nippon Telegraph and Telephone Corporation
Kyota Hattori
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
BURST OPTICAL RELAYING DEVICE AND BURST OPTICAL RELAYING METHOD
Publication number
20230155673
Publication date
May 18, 2023
Nippon Telegraph and Telephone Corporation
Kana MASUMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL DEMULTIPLEXER, OPTICAL SEPARATION DEVICE, OPTICAL TRANSMISS...
Publication number
20220360355
Publication date
Nov 10, 2022
Nippon Telegraph and Telephone Corporation
Kana Masumoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
TRANSMISSION DEVICE, TIME TRANSMISSION SYSTEM, AND DELAY COMPENSATI...
Publication number
20220294549
Publication date
Sep 15, 2022
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL BRANCH INSERTION DEVICE AND OPTICAL TRANSMISSION SYSTEM USI...
Publication number
20220182169
Publication date
Jun 9, 2022
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL BRANCH INSERTION DEVICE AND OPTICAL TRANSMISSION SYSTEM USI...
Publication number
20220149968
Publication date
May 12, 2022
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
TIME TRANSMISSION DEVICE AND TRANSMISSION METHOD
Publication number
20220140991
Publication date
May 5, 2022
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
TRANSMISSION DEVICE, TIME TRANSMISSION SYSTEM, AND DELAY COMPENSATI...
Publication number
20220103281
Publication date
Mar 31, 2022
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
TIME COMPARISON DEVICE AND TIME QUALITY MONITORING METHOD
Publication number
20220078736
Publication date
Mar 10, 2022
Nippon Telegraph and Telephone Corporation
Kaoru Arai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
TIME SYNCHRONIZATION PATH SELECTION DEVICE AND TIME SYNCHRONIZATION...
Publication number
20220060310
Publication date
Feb 24, 2022
Nippon Telegraph and Telephone Corporation
Kaoru ARAI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
TIME TRANSMISSION CORRECTION DEVICE, TIME TRANSMISSION SYSTEM, AND...
Publication number
20220026857
Publication date
Jan 27, 2022
Nippon Telegraph and Telephone Corporation
Kaoru Arai
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
TRANSMISSION DEVICE, TIME TRANSMISSION SYSTEM, AND DELAY MEASUREMEN...
Publication number
20220022151
Publication date
Jan 20, 2022
Nippon Telegraph and Telephone Corporation
Kaoru Arai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
DISPERSION COMPENSATION SYSTEM AND DISPERSION COMPENSATION METHOD
Publication number
20210266069
Publication date
Aug 26, 2021
Nippon Telegraph and Telephone Corporation
Kana MASUMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL NETWORK SYSTEM, OPTICAL SWITCH NODE, MASTER NODE, AND NODE
Publication number
20150131991
Publication date
May 14, 2015
Nippon Telegraph and Telephone Corporation
Kyota Hattori
H04 - ELECTRIC COMMUNICATION TECHNIQUE