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For the Inventor, By the Inventor

Yokohama, Japan

Sumitomo Electric Optifrontier Co., Ltd.


USPTO Granted Patents = 49


Forward Citations = 23

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64 inventors (with patents filed for the assignee):

goldMedal Ryuichiro Sato (9 out of 36 patents)

silverMedal Yoshikyo Tamekuni (8 out of 30 patents)

bronzeMedal Kazufumi Joko (8 out of 12 patents)

4.  Takahiro Inaba (7 out of 7 patents)

5.  Kenichiro Otsuka (6 out of 14 patents)

6.  Hiroshi Takayanagi (6 out of 41 patents)

7.  Kazuyoshi Ooki (6 out of 15 patents)

8.  Junji Fukui (6 out of 13 patents)

9.  Hideaki Yusa (6 out of 11 patents)

10.  Ryosuke Meo (5 out of 10 patents)

11.  Masahiro Shibata (5 out of 82 patents)

12.  Yuta Ryono (5 out of 6 patents)

13.  Takayuki Shimazu (5 out of 23 patents)

14.  Motoyoshi Kimura (4 out of 23 patents)

15.  Yoshihiro Takeyama (4 out of 4 patents)


Core Competencies:
Optical Fiber Cutter
Fusion Splicing Device
Optical Fiber Connector
Optical Fiber Fusion Splicer
Optical Connection Structure
Gain Flattening Filter
Optical Transmission Path Inspection
Cable Stripping Tool
Optical Fiber Alignment
Reinforcement Sleeve Heating Device
Optical Fiber Holder
Optical Fiber Cleaving Apparatus

49 patents:

1. D1105876 - Optical fiber cutter (2025-12-16),
2. D1105874 - Optical fiber coating removal tool (2025-12-16),
3. 12491654 - Optical fiber cutter (2025-12-09),
4. 12468093 - Optical wiring and optical connection method (2025-11-11),
5. D1101007 - Optical fiber fusion splicer (2025-11-04),
6. 12461311 - Fusion splicing system, fusion splicing device, and deterioration determination method (2025-11-04),
7. D1092581 - Optical fiber fusion splicer (2025-09-09),
8. D1092411 - Optical fiber alignment member (2025-09-09),
9. D1092408 - Optical fiber connector (2025-09-09),
10. D1092407 - Optical fiber connector (2025-09-09),
11. 12384598 - Housing case for fusion splicer and fusion splicer set (2025-08-12),
12. D1073757 - Fusion splicer working tray (2025-05-06),
13. 12276841 - Optical fiber fusion splicing method and fusion splicing device (2025-04-14),
14. 12248185 - Optical connection structure, optical connector, and optical connecting method (2025-03-11),
15. 12206226 - Cable stripping tool (2025-01-21),
Sumitomo Electric Optifrontier Co., Ltd. is a subsidiary of Sumitomo Electric Industries, specializing in the development and manufacturing of optical components and subsystems for telecommunications and data communications. With a focus on cutting-edge technology and quality, the company is a leading provider of advanced solutions for high-speed communication networks.
This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Jan 6 2026

49 Patents

#26 in Yokohama

#1,702 in Japan

#13,874 in the World

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Yokohama, Japan

Sumitomo Electric Optifrontier Co., Ltd.

Forward Citations = 23

64 inventors:

goldMedal Ryuichiro Sato (9 out of 36 patents)

silverMedal Yoshikyo Tamekuni (8 out of 30 patents)

bronzeMedal Kazufumi Joko (8 out of 12 patents)

4.  Takahiro Inaba (7 out of 7 patents)

5.  Kenichiro Otsuka (6 out of 14 patents)

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