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For the Inventor, By the Inventor

Tokyo, Japan

Okenseiko Co., Ltd.


USPTO Granted Patents = 16


Trademarks = 1

Forward Citations = 137

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7 inventors (with patents filed for the assignee):

goldMedal Tadashi Fukami (9 out of 44 patents)

silverMedal Goro Kakizawa (4 out of 6 patents)

bronzeMedal Akira Inoue (3 out of 129 patents)

4.  Kazuki Itahara (3 out of 5 patents)

5.  Koji Onishi (3 out of 16 patents)

6.  Koichi Nakatsugi (2 out of 5 patents)

7.  Fumitaka Takamizawa (1 out of 1 patent)

8.  Akira Inoue (0 patent)

9.  Tadashi c/oOken Seiko Co Ltd Fukami (0 patent)

10.  Koji c/oOken Seiko Co Ltd Onishi (0 patent)

11.  Goro c/oOken Seiko Co Ltd Kakizawa (0 patent)

12.  Koichi c/oOken Seiko Co Ltd Nakatsugi (0 patent)


16 patents:

1. 11225960 - Diaphragm pump (2022-01-18),
2. 10641262 - Diaphragm pump (2020-05-05),
3. 10641261 - Pump with motor (2020-05-05),
4. 10550832 - Diaphragm pump (2020-02-04),
5. 10001118 - Rapid-discharge-valve structural body and diaphragm pump (2018-06-19),
6. 9951769 - Diaphragm pump integrally including quick discharge valve unit (2018-04-24),
7. 9453504 - Diaphragm pump (2016-09-27),
8. 9341176 - Diaphragm pump (2016-05-17),
9. 7040876 - Valves for a diaphragm pump (2006-05-09),
10. 6843643 - Valve mounting arrangement in a diaphragm pump (2005-01-18),
11. 6506033 - Miniature pump with ball-plate drive (2003-01-14),
12. 6435844 - Diaphragm pump (2002-08-20),
13. 6215208 - Miniature motor unit (2001-04-10),
14. 6206664 - Compact pump (2001-03-27),
15. 4604540 - Coreless motor, and a method for manufacturing the coreless motor (1986-08-05),
Company Overview
Okenseiko Co., Ltd. is a Tokyo-based company specializing in precision engineering and manufacturing solutions. The organization focuses on developing advanced components and systems for various industries, including automotive and electronics. With a commitment to innovation, Okenseiko leverages cutting-edge technologies to enhance product performance and reliability. The company is recognized for its expertise in precision machining and assembly, contributing to the advancement of high-quality manufacturing standards in Japan and beyond.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

16 Patents

#1,500 in Tokyo

#3,343 in Japan

#37,868 in the World

Tokyo, JP
Tokyo, Japan

Okenseiko Co., Ltd.

Forward Citations = 137

7 inventors:

goldMedal Tadashi Fukami (9 out of 44 patents)

silverMedal Goro Kakizawa (4 out of 6 patents)

bronzeMedal Akira Inoue (3 out of 129 patents)

4.  Kazuki Itahara (3 out of 5 patents)

5.  Koji Onishi (3 out of 16 patents)

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