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For the Inventor, By the Inventor

Yokohama, Japan

Sumitomo Electric Optifrontier Co., Ltd.

USPTO Granted Patents = 49


Forward Citations = 32

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62 inventors (with patents filed for the assignee):

goldMedal Ryuichiro Sato (9 out of 37 patents)

silverMedal Yoshikyo Tamekuni (8 out of 30 patents)

bronzeMedal Kazufumi Joko (8 out of 15 patents)

4.  Takahiro Inaba (7 out of 7 patents)

5.  Kenichiro Otsuka (6 out of 16 patents)

6.  Hiroshi Takayanagi (6 out of 41 patents)

7.  Kazuyoshi Ooki (6 out of 20 patents)

8.  Junji Fukui (6 out of 13 patents)

9.  Hideaki Yusa (6 out of 12 patents)

10.  Ryosuke Meo (5 out of 11 patents)

11.  Masahiro Shibata (5 out of 86 patents)

12.  Yuta Ryono (5 out of 6 patents)

13.  Takayuki Shimazu (5 out of 24 patents)

14.  Motoyoshi Kimura (4 out of 27 patents)

15.  Yoshihiro Takeyama (4 out of 4 patents)


Core Competencies:
Optical Fiber
Fusion Splicing
Optical Connectors
Optical Cutter
Coating Removal Tool
Alignment Member
Inspection System
Cable Stripping Tool
Gain Flattening Filter
Wiring Module
Storage Case
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),
Company Overview
Sumitomo Electric Optifrontier Co., Ltd. is a prominent player in the optical fiber technology sector, specializing in the development and manufacturing of advanced optical communication equipment. The company focuses on a range of products including optical fiber cutters, fusion splicing devices, and optical connectors, which are essential for efficient data transmission. Based in Yokohama, Japan, Sumitomo Electric Optifrontier is committed to enhancing optical connectivity solutions through innovative technologies and high-quality manufacturing processes.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

49 Patents

#35 in Yokohama

#1,738 in Japan

#14,293 in the World

Yokohama, JP
Yokohama, Japan

Sumitomo Electric Optifrontier Co., Ltd.

Forward Citations = 32

62 inventors:

goldMedal Ryuichiro Sato (9 out of 37 patents)

silverMedal Yoshikyo Tamekuni (8 out of 30 patents)

bronzeMedal Kazufumi Joko (8 out of 15 patents)

4.  Takahiro Inaba (7 out of 7 patents)

5.  Kenichiro Otsuka (6 out of 16 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sumitomo Electric Optifrontier Co., Ltd.. Retrieved from https://idiyas.com/company/sumitomo-electric-optifrontier-company

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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