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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),
SEI OPTIFRONTIER CO., LTD. is a software company specializing in multidisciplinary design optimization (MDO) solutions. With a focus on engineering and scientific applications, they offer the OPTIMUS and modeFRONTIER software platforms. These platforms enable users to automate and optimize complex processes, making product development more efficient and cost-effective. SEI OPTIFRONTIER is committed to providing innovative and reliable solutions to industries such as automotive, aerospace, energy, and many more.
This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Sep 22 2026

80 Patents

#26 in Yokohama

#1,302 in Japan

#9,433 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)

Please report any incorrect information to [email protected]
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