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For the Inventor, By the Inventor

Yokohama, Japan

Sei Optifrontier Co., Ltd.


USPTO Granted Patents = 80

% Expired Patents = 2.5



Forward Citations = 491

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84 inventors (with patents filed for the assignee):

goldMedal Ryuichiro Sato (18 out of 37 patents)

silverMedal Masahiro Hasegawa (13 out of 16 patents)

bronzeMedal Toshihiko Homma (13 out of 19 patents)

4.  Hiroshi Takayanagi (12 out of 41 patents)

5.  Makoto Miyamori (10 out of 13 patents)

6.  Yuji Suzuki (10 out of 29 patents)

7.  Hiroyasu Toyooka (9 out of 13 patents)

8.  Kazuyoshi Ooki (8 out of 20 patents)

9.  Yoshikyo Tamekuni (8 out of 30 patents)

10.  Yukihiro Yokomachi (8 out of 22 patents)

11.  Kenichiro Ohtsuka (6 out of 37 patents)

12.  Motoyoshi Kimura (5 out of 27 patents)

13.  Ryosuke Meo (5 out of 11 patents)

14.  Kazuya Masuda (5 out of 10 patents)

15.  Tomoyuki Yokokawa (5 out of 21 patents)


Core Competencies:
Fusion Splicing
Optical Connector
Theft Sensing
Optical Fiber Cutter
Optical Fiber Holder
Measurement System
Optical Amplifier
Reinforcement Device
Termination Unit
Optical Module
Fiber Cleaver
Housing for Connector

80 patents:

1. 12332627 - Fusion splicing apparatus management system and fusion splicing apparatus management method (2025-06-17),
2. 11768328 - Fusion connection device, wireless information terminal, fusion connection system, and fusion connection method (2023-09-26),
3. 11454761 - Fusion connection device, wireless information terminal, fusion connection system, and fusion connection method (2022-09-27),
4. 11435529 - Optical fiber holder (2022-09-06),
5. 11288938 - Fusion splicing device, theft sensing system of fusion splicing device, and theft sensing method of fusion splicing device (2022-03-29),
6. 11257335 - Theft sensing system for fusion splicer device and fusion splicer device (2022-02-22),
7. 11204465 - Optical fiber holder and fusion-splicing apparatus including optical fiber holder (2021-12-21),
8. 11181692 - Reinforcing apparatus for optical fiber fusion-splicing part and fusion splicer provided with the same (2021-11-23),
9. 11156787 - Optical connector (2021-10-26),
10. 11073671 - Termination unit (2021-07-27),
11. D918016 - Reinforcement device for the optical fiber fusion splicer (2021-05-04),
12. 10989875 - Theft tracking system and theft tracking method for optical fiber fusion splicing device (2021-04-27),
13. 10928591 - Neck-hung fusion splicer operation tray having detachable flanking trays (2021-02-23),
14. 10921527 - Optical fiber holder (2021-02-16),
15. 10901723 - Management system for fusion splicing device and management method for fusion splicing device (2021-01-26),
Company Overview
Sei Optifrontier Co., Ltd. is a prominent player in the field of optical fiber technology, headquartered in Yokohama, Japan. The company specializes in the development and manufacturing of advanced solutions such as fusion splicing equipment, optical connectors, and measurement systems. Their innovative products also include theft sensing devices, optical fiber cutters, and reinforcement devices, catering to a diverse range of applications in telecommunications and data transmission. Sei Optifrontier is committed to enhancing optical communication technologies through continuous research and development.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

80 Patents

#26 in Yokohama

#1,304 in Japan

#9,454 in the World

Yokohama, JP
Yokohama, Japan

Sei Optifrontier Co., Ltd.

Forward Citations = 491

84 inventors:

goldMedal Ryuichiro Sato (18 out of 37 patents)

silverMedal Masahiro Hasegawa (13 out of 16 patents)

bronzeMedal Toshihiko Homma (13 out of 19 patents)

4.  Hiroshi Takayanagi (12 out of 41 patents)

5.  Makoto Miyamori (10 out of 13 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sei Optifrontier Co., Ltd.. Retrieved from https://idiyas.com/company/sei-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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