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Yokohama, Japan

Sumitomo Electric Optifrontier Co., Ltd.

USPTO Granted Patents = 47

EPO Patents = 13

Forward Citations = 19

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70 inventors (with patents filed for the assignee):

Ryuichiro Sato (8 out of 35 patents)

Yoshikyo Tamekuni (8 out of 30 patents)

Takahiro Inaba (7 out of 7 patents)

4. Kazufumi Joko (7 out of 11 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. Takayuki Shimazu (5 out of 23 patents)

13. Motoyoshi Kimura (4 out of 23 patents)

14. Yoshihiro Takeyama (4 out of 4 patents)

15. Mitsumasa Seita (4 out of 5 patents)

47 patents: Sort by Forward Citations

1. 12491654 - Optical fiber cutter (2025-12-09),

2. 12468093 - Optical wiring and optical connection method (2025-11-11),

3. D1101007 - Optical fiber fusion splicer (2025-11-04),

4. 12461311 - Fusion splicing system, fusion splicing device, and deterioration determination method (2025-11-04),

5. D1092581 - Optical fiber fusion splicer (2025-09-09),

6. D1092411 - Optical fiber alignment member (2025-09-09),

7. D1092408 - Optical fiber connector (2025-09-09),

8. D1092407 - Optical fiber connector (2025-09-09),

9. 12384598 - Housing case for fusion splicer and fusion splicer set (2025-08-12),

10. D1073757 - Fusion splicer working tray (2025-05-06),

11. 12276841 - Optical fiber fusion splicing method and fusion splicing device (2025-04-14),

12. 12248185 - Optical connection structure, optical connector, and optical connecting method (2025-03-11),

13. 12206226 - Cable stripping tool (2025-01-21),

14. 12204140 - Gain flattening filter, and method for manufacturing gain flattening filter (2025-01-21),

15. 12197010 - Reinforcement sleeve heating device and fusion splicing machine (2025-01-14),

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.

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

47 Patents

#27 in Yokohama

#1,739 in Japan

#14,382 in the World

Yokohama, Japan

Sumitomo Electric Optifrontier Co., Ltd.

Forward Citations = 19

70 inventors:

Ryuichiro Sato (8 out of 35 patents)

Yoshikyo Tamekuni (8 out of 30 patents)

Takahiro Inaba (7 out of 7 patents)

4. Kazufumi Joko (7 out of 11 patents)

5. Kenichiro Otsuka (6 out of 14 patents)

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