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For the Inventor, By the Inventor

Tokyo, Japan

Sankosha Corporation


USPTO Granted Patents = 18

% Expired Patents = 33.3


Forward Citations = 80

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33 inventors (with patents filed for the assignee):

goldMedal Masaaki Sato (5 out of 60 patents)

silverMedal Yutaka Hayashi (3 out of 42 patents)

bronzeMedal Tsuyoshi Kawabata (3 out of 3 patents)

4.  Yoshiki Maeyashiki (3 out of 3 patents)

5.  Makoto Ishizaki (2 out of 6 patents)

6.  Yasuharu Yamada (2 out of 31 patents)

7.  Takayuki Okawa (2 out of 19 patents)

8.  Hideyoshi Saeki (2 out of 2 patents)

9.  Takuya Ouchi (2 out of 2 patents)

10.  Minoru Yoneda (2 out of 8 patents)

11.  Hirofumi Yoshihara (2 out of 2 patents)

12.  Kenta Kobayashi (1 out of 7 patents)

13.  Yuichi Takahashi (1 out of 48 patents)

14.  Hidetoshi Ito (1 out of 3 patents)

15.  Kouji Idota (1 out of 1 patent)


18 patents:

1. 12683305 - Grounding resistance reducing material and grounding device (2026-07-14),
2. 10158222 - Surge protective device and surge protective system (2018-12-18),
3. 9812858 - Surge protective system (2017-11-07),
4. 9153955 - Communication line isolator (2015-10-06),
5. 8730638 - Lightning surge detector, surge protective device, and management system for surge protective device (2014-05-20),
6. 8647158 - Device for mounting protector on din rail (2014-02-11),
7. 8482277 - Surge current detection device (2013-07-09),
8. 8410773 - Surge current detection device (2013-04-02),
9. 7619161 - Grounding device and method of constructing the same (2009-11-17),
10. 7385140 - Grounding conductor (2008-06-10),
11. 5905282 - Multi-terminal surge protection device (1999-05-18),
12. 5486709 - Surge protection device (1996-01-23),
13. 5376809 - Surge protection device (1994-12-27),
14. 5371385 - Surge protection device (1994-12-06),
15. 5343065 - Method of controlling surge protection device hold current (1994-08-30),
Company Overview
Sankosha Corporation, based in Tokyo, specializes in the development and manufacturing of advanced industrial equipment and materials. The company focuses on providing innovative solutions in the fields of textile machinery, precision engineering, and automation technologies. With a commitment to quality and technological advancement, Sankosha serves various sectors, enhancing productivity and efficiency through its cutting-edge products and services. The organization is recognized for its expertise in integrating traditional craftsmanship with modern technology.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

18 Patents

#1,413 in Tokyo

#3,121 in Japan

#34,187 in the World

Tokyo, JP
Tokyo, Japan

Sankosha Corporation

Forward Citations = 80

33 inventors:

goldMedal Masaaki Sato (5 out of 60 patents)

silverMedal Yutaka Hayashi (3 out of 42 patents)

bronzeMedal Tsuyoshi Kawabata (3 out of 3 patents)

4.  Yoshiki Maeyashiki (3 out of 3 patents)

5.  Makoto Ishizaki (2 out of 6 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sankosha Corporation. Retrieved from https://idiyas.com/company/sankosha

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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