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For the Inventor, By the Inventor

Yokosuka_, Japan

Oppama Industry Co., Ltd

Calculating rank
USPTO Granted Patents = 21

% Expired Patents = 33.3



Forward Citations = 80

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23 inventors (with patents filed for the assignee):

goldMedal Masao Iwata (10 out of 19 patents)

silverMedal Yoshiki Kitamura (6 out of 7 patents)

bronzeMedal Yuichi Tsuyuki (4 out of 4 patents)

4.  Shigeyuki Suzuki (4 out of 4 patents)

5.  Norio Kawai (4 out of 5 patents)

6.  Shigeo Take (4 out of 13 patents)

7.  Hiromi Watanabe (3 out of 8 patents)

8.  Kohsuke Watanabe (3 out of 3 patents)

9.  Toshiyuki Takano (3 out of 3 patents)

10.  Kiyoshige Enomoto (3 out of 10 patents)

11.  Takuo Yoshizaki (2 out of 8 patents)

12.  Fumitake Matsuda (2 out of 2 patents)

13.  Atsushi Kawahara (2 out of 2 patents)

14.  Takahiro Yamazaki (1 out of 46 patents)

15.  Yuta Kobayashi (1 out of 14 patents)


21 patents:

1. 11835022 - Engine working apparatus (2023-12-05),
2. 11761415 - Ignition coil unit (2023-09-19),
3. 10273925 - Two-stroke internal combustion engine (2019-04-30),
4. 9726095 - Engine driven working machine (2017-08-08),
5. 8161943 - Non-contact ignition control device of internal combustion engine (2012-04-24),
6. 7913547 - Engine rotating meter (2011-03-29),
7. 7726181 - Ignition timing measuring and display device of internal combustion engine (2010-06-01),
8. 6902318 - Thermometer for engine of vehicle (2005-06-07),
9. 6873073 - Magneto rotor (2005-03-29),
10. 6814056 - Contactless ignition system for internal combustion engine (2004-11-09),
11. 6584957 - Contactless ignition system for internal combustion engine (2003-07-01),
12. 6467147 - Magneto electric generator rotor and an implement for removing this rotor (2002-10-22),
13. 6023828 - Magneto electric generator rotor and an implement for removing this rotor (2000-02-15),
14. 5903079 - Rotor of rotating equipment (1999-05-11),
15. 5811908 - Magneto electric generator rotor and an implement for removing this rotor (1998-09-22),
Company Overview
Oppama Industry Co., Ltd, based in Yokosuka, Kanagawa, specializes in the development and manufacturing of precision components and systems for various industries. The company focuses on advanced technologies in fields such as automotive engineering and industrial machinery, providing innovative solutions that enhance performance and efficiency. With a commitment to quality and technological advancement, Oppama plays a significant role in supporting the evolving needs of its clients across diverse sectors.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Nov 3 2026

21 Patents

#3 in Yokosuka_

#2,867 in Japan

#30,040 in the World

Yokosuka_, JP
Yokosuka_, Japan

Oppama Industry Co., Ltd

Forward Citations = 80

23 inventors:

goldMedal Masao Iwata (10 out of 19 patents)

silverMedal Yoshiki Kitamura (6 out of 7 patents)

bronzeMedal Yuichi Tsuyuki (4 out of 4 patents)

4.  Shigeyuki Suzuki (4 out of 4 patents)

5.  Norio Kawai (4 out of 5 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Oppama Industry Co., Ltd. Retrieved from https://idiyas.com/company/oppama-industry-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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