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Kazuhide Nakajima
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Mito-shi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Optical transmission system
Patent number
11,956,070
Issue date
Apr 9, 2024
Nippon Telegraph and Telephone Corporation
Taiji Sakamoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Core position grasping method, connection method, and connection de...
Patent number
11,906,783
Issue date
Feb 20, 2024
Nippon Telegraph and Telephone Corporation
Yoko Yamashita
G02 - OPTICS
Information
Patent Grant
Multicore optical fiber, method of designing multicore optical fibe...
Patent number
11,899,237
Issue date
Feb 13, 2024
Nippon Telegraph and Telephone Corporation
Takashi Matsui
G02 - OPTICS
Information
Patent Grant
Hole assisted optical fiber
Patent number
11,860,405
Issue date
Jan 2, 2024
Nippon Telegraph and Telephone Corporation
Saki Nozoe
G02 - OPTICS
Information
Patent Grant
Acoustic mode propagation speed measurement method and acoustic mod...
Patent number
11,815,421
Issue date
Nov 14, 2023
Nippon Telegraph and Telephone Corporation
Yuto Sagae
G01 - MEASURING TESTING
Information
Patent Grant
Multicore optical fiber and design method
Patent number
11,762,144
Issue date
Sep 19, 2023
Nippon Telegraph and Telephone Corporation
Takashi Matsui
G02 - OPTICS
Information
Patent Grant
Optical communication system and optical communication method
Patent number
11,722,223
Issue date
Aug 8, 2023
Nippon Telegraph and Telephone Corporation
Yuto Sagae
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical connector ferrule, sleeve, and method for manufacturing fer...
Patent number
11,474,303
Issue date
Oct 18, 2022
Nippon Telegraph and Telephone Corporation
Masaaki Takaya
G02 - OPTICS
Information
Patent Grant
Multi-core fiber connector
Patent number
11,454,757
Issue date
Sep 27, 2022
Nippon Telegraph and Telephone Corporation
Taiji Sakamoto
G02 - OPTICS
Information
Patent Grant
Optical fiber and optical transmission system
Patent number
11,366,266
Issue date
Jun 21, 2022
Nippon Telegraph and Telephone Corporation
Yuto Sagae
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical fiber manufacturing method using relative bulk densities
Patent number
11,237,322
Issue date
Feb 1, 2022
Furukawa Electric Co., Ltd.
Shinichi Arai
G02 - OPTICS
Information
Patent Grant
Optical amplifier
Patent number
11,196,227
Issue date
Dec 7, 2021
Nippon Telegraph and Telephone Corporation
Masaki Wada
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Optical fiber and optical transmission system
Patent number
11,156,767
Issue date
Oct 26, 2021
Nippon Telegraph and Telephone Corporation
Azusa Urushibara
G02 - OPTICS
Information
Patent Grant
Connection device, optical connector manufacturing device, connecti...
Patent number
10,955,622
Issue date
Mar 23, 2021
Nippon Telegraph and Telephone Corporation
Takashi Matsui
G02 - OPTICS
Information
Patent Grant
Optical fiber design method
Patent number
10,871,648
Issue date
Dec 22, 2020
Nippon Telegraph and Telephone Corporation
Takashi Matsui
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Optical fiber and optical transmission system
Patent number
10,790,905
Issue date
Sep 29, 2020
Nippon Telegraph and Telephone Corporation
Takayoshi Mori
G02 - OPTICS
Information
Patent Grant
Inter-mode loss difference compensator and optical amplifier
Patent number
10,782,478
Issue date
Sep 22, 2020
Nippon Telegraph and Telephone Corporation
Masaki Wada
G02 - OPTICS
Information
Patent Grant
Optical transmission system
Patent number
10,705,291
Issue date
Jul 7, 2020
Nippon Telegraph and Telephone Corporation
Azusa Urushibara
G02 - OPTICS
Information
Patent Grant
Alignment apparatus and alignment method
Patent number
10,620,372
Issue date
Apr 14, 2020
Nippon Telegraph and Telephone Corporation
Takashi Matsui
G01 - MEASURING TESTING
Information
Patent Grant
Optical connector
Patent number
10,585,235
Issue date
Mar 10, 2020
Nippon Telegraph and Telephone Corporation
Taiji Sakamoto
G02 - OPTICS
Information
Patent Grant
Photonic crystal fiber and high-power light transmission system
Patent number
10,545,333
Issue date
Jan 28, 2020
Nippon Telegraph and Telephone Corporation
Takashi Matsui
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Photonic crystal fiber and high-power light transmission system
Patent number
10,539,784
Issue date
Jan 21, 2020
Nippon Telegraph and Telephone Corporation
Takashi Matsui
G02 - OPTICS
Information
Patent Grant
Measuring method of longitudinal distribution of bending loss of op...
Patent number
9,562,827
Issue date
Feb 7, 2017
Fujikura Ltd.
Shoji Tanigawa
G01 - MEASURING TESTING
Information
Patent Grant
Crosstalk measuring method and crosstalk measuring device
Patent number
9,252,872
Issue date
Feb 2, 2016
Fujikura Ltd.
Hiroki Hamaguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Measuring method of hole diameter, hole position, hole surface roug...
Patent number
9,175,946
Issue date
Nov 3, 2015
Nippon Telegraph and Telephone Corporation
Itaru Ishida
G01 - MEASURING TESTING
Information
Patent Grant
Hole-assisted optical fiber
Patent number
9,075,185
Issue date
Jul 7, 2015
Furukawa Electric Co., Ltd.
Naomi Kumano
G02 - OPTICS
Information
Patent Grant
Optical connector and method for assembling same
Patent number
8,702,317
Issue date
Apr 22, 2014
Nippon Telegraph and Telephone Corporation
Ryo Koyama
G02 - OPTICS
Information
Patent Grant
Optical fiber preform manufacturing method
Patent number
8,181,487
Issue date
May 22, 2012
Furukawa Electric Co., Ltd.
Ryuichi Sugizaki
C03 - GLASS MINERAL OR SLAG WOOL
Information
Patent Grant
Hole-assisted single mode optical fiber
Patent number
7,228,040
Issue date
Jun 5, 2007
Nippon Telegraph and Telephone Corporation
Kazuhide Nakajima
G02 - OPTICS
Patents Applications
last 30 patents
Information
Patent Application
ULTRAVIOLET LIGHT IRRADIATION SYSTEM AND ULTRAVIOLET LIGHT IRRADIAT...
Publication number
20240157003
Publication date
May 16, 2024
Nippon Telegraph and Telephone Corporation
Ayako IWAKI
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Application
MODE CONVERSION DEVICE AND DESIGN METHOD
Publication number
20240142696
Publication date
May 2, 2024
Nippon Telegraph and Telephone Corporation
Yoko YAMASHITA
G02 - OPTICS
Information
Patent Application
MULTICORE OPTICAL FIBER, METHOD OF DESIGNING MULTICORE OPTICAL FIBE...
Publication number
20240118486
Publication date
Apr 11, 2024
Nippon Telegraph and Telephone Corporation
Takashi Matsui
G02 - OPTICS
Information
Patent Application
EVALUATION METHOD AND EVALUATION DEVICE FOR MULTI-CORE FIBER
Publication number
20240102886
Publication date
Mar 28, 2024
Nippon Telegraph and Telephone Corporation
Nobutomo HANZAWA
C03 - GLASS MINERAL OR SLAG WOOL
Information
Patent Application
FIBER OPTIC AMPLIFIER
Publication number
20240072507
Publication date
Feb 29, 2024
Nippon Telegraph and Telephone Corporation
Shinichi AOZASA
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
OPTICAL FIBER
Publication number
20240061168
Publication date
Feb 22, 2024
Nippon Telegraph and Telephone Corporation
Yuto SAGAE
G02 - OPTICS
Information
Patent Application
MULTICORE OPTICAL FIBER AND DESIGN METHOD
Publication number
20240027678
Publication date
Jan 25, 2024
Nippon Telegraph and Telephone Corporation
Takashi Matsui
G02 - OPTICS
Information
Patent Application
APPARATUS AND METHODS FOR CALCULATING THE BEHAVIOR OF LINEAR STRUCT...
Publication number
20240019323
Publication date
Jan 18, 2024
Nippon Telegraph and Telephone Corporation
Takashi MATSUI
G01 - MEASURING TESTING
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM
Publication number
20240007189
Publication date
Jan 4, 2024
Nippon Telegraph and Telephone Corporation
Yuto SAGAE
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
ULTRAVIOLET LIGHT IRRADIATION SYSTEM AND METHOD
Publication number
20230408761
Publication date
Dec 21, 2023
Nippon Telegraph and Telephone Corporation
Tomohiro TANIGUCHI
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Application
OPTICAL SIDE INPUT/OUTPUT CIRCUIT AND OPTICAL CONNECTOR
Publication number
20230400625
Publication date
Dec 14, 2023
Nippon Telegraph and Telephone Corporation
Yoko YAMASHITA
G02 - OPTICS
Information
Patent Application
ULTRAVIOLET LIGHT IRRADIATION SYSTEM AND ULTRAVIOLET LIGHT IRRADIAT...
Publication number
20230390436
Publication date
Dec 7, 2023
Nippon Telegraph and Telephone Corporation
Tomohiro TANIGUCHI
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Application
OPTICAL SIDE INPUT/OUTPUT CIRCUIT AND OPTICAL CONNECTOR
Publication number
20230358966
Publication date
Nov 9, 2023
Nippon Telegraph and Telephone Corporation
Yoko YAMASHITA
G02 - OPTICS
Information
Patent Application
MULTI-CORE OPTICAL FIBER AND DESIGN METHOD
Publication number
20230341618
Publication date
Oct 26, 2023
Nippon Telegraph and Telephone Corporation
Takashi MATSUI
G02 - OPTICS
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION METHOD
Publication number
20230336338
Publication date
Oct 19, 2023
Nippon Telegraph and Telephone Corporation
Yuto SAGAE
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
LONG PERIOD FIBER GRATING AND OPTICAL TRANSMISSION SYSTEM
Publication number
20230324604
Publication date
Oct 12, 2023
Nippon Telegraph and Telephone Corporation
Ryota IMADA
G02 - OPTICS
Information
Patent Application
LIGHT IRRADIATION SYSTEM
Publication number
20230310674
Publication date
Oct 5, 2023
Nippon Telegraph and Telephone Corporation
Tomohiro TANIGUCHI
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Application
ULTRAVIOLET LIGHT IRRADIATION SYSTEM AND ULTRAVIOLET LIGHT IRRADIAT...
Publication number
20230302173
Publication date
Sep 28, 2023
Nippon Telegraph and Telephone Corporation
Tomohiro TANIGUCHI
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Application
OPTICAL CONNECTOR
Publication number
20230305223
Publication date
Sep 28, 2023
Nippon Telegraph and Telephone Corporation
Yoko YAMASHITA
G02 - OPTICS
Information
Patent Application
ULTRAVIOLET LIGHT IRRADIATION SYSTEM AND DECONTAMINATION METHOD
Publication number
20230293741
Publication date
Sep 21, 2023
Nippon Telegraph and Telephone Corporation
Takashi MATSUI
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Application
MULTI-CORE OPTICAL FIBER
Publication number
20230280525
Publication date
Sep 7, 2023
Nippon Telegraph and Telephone Corporation
Takashi MATSUI
G02 - OPTICS
Information
Patent Application
ULTRAVIOLET LIGHT IRRADIATION SYSTEM AND DECONTAMINATION METHOD
Publication number
20230270898
Publication date
Aug 31, 2023
Nippon Telegraph and Telephone Corporation
Takashi MATSUI
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Application
OPTICAL FIBER
Publication number
20230244028
Publication date
Aug 3, 2023
Nippon Telegraph and Telephone Corporation
Yuto SAGAE
G02 - OPTICS
Information
Patent Application
OPTICAL FIBER EVALUATION DEVICE AND OPTICAL FIBER EVALUATION METHOD
Publication number
20230221487
Publication date
Jul 13, 2023
Nippon Telegraph and Telephone Corporation
Nobutomo HANZAWA
G02 - OPTICS
Information
Patent Application
PROPAGATION MODE LOSS DIFFERENCE COMPENSATOR
Publication number
20230176284
Publication date
Jun 8, 2023
Nippon Telegraph and Telephone Corporation
Yoko YAMASHITA
G02 - OPTICS
Information
Patent Application
OPTICAL FIBER AMPLIFIER AND RARE EARTH DOPED OPTICAL FIBER
Publication number
20230163554
Publication date
May 25, 2023
Nippon Telegraph and Telephone Corporation
Shinichi AOZASA
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
SHAPE MEASUREMENT SYSTEM AND SHAPE MEASUREMENT METHOD
Publication number
20230147800
Publication date
May 11, 2023
Nippon Telegraph and Telephone Corporation
Nobutomo HANZAWA
G01 - MEASURING TESTING
Information
Patent Application
RARE EARTH DOPED FIBER AND FIBER OPTIC AMPLIFIER
Publication number
20230042437
Publication date
Feb 9, 2023
Nippon Telegraph and Telephone Corporation
Yoko YAMASHITA
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
CORE POSITION GRASPING METHOD, CONNECTION METHOD, AND CONNECTION DE...
Publication number
20220365282
Publication date
Nov 17, 2022
Nippon Telegraph and Telephone Corporation
Yoko YAMASHITA
G02 - OPTICS
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM
Publication number
20220360358
Publication date
Nov 10, 2022
Nippon Telegraph and Telephone Corporation
Taiji SAKAMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE