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For the Inventor, By the Inventor

Kanagawa, Japan

Tokyo Roki Co., Ltd.

Calculating rank
USPTO Granted Patents = 38

% Expired Patents = 15.8


Forward Citations = 278

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87 inventors (with patents filed for the assignee):

goldMedal Kosaku Ishida (12 out of 12 patents)

silverMedal Yoshitaka Watanabe (5 out of 10 patents)

bronzeMedal Isamu Kanaya (5 out of 6 patents)

4.  Takatsugu Kurosawa (4 out of 4 patents)

5.  Takayuki Mori (3 out of 5 patents)

6.  Tatsuhito Yamada (3 out of 3 patents)

7.  Kiminobu Hirata (3 out of 20 patents)

8.  Daisuke Shirai (3 out of 4 patents)

9.  Hitoshi Hiramoto (3 out of 4 patents)

10.  Shigeru Yasaki (3 out of 3 patents)

11.  Yasutaka Yoshino (3 out of 3 patents)

12.  Tomoaki Fukuoka (2 out of 3 patents)

13.  Tsuyoshi Yao (2 out of 3 patents)

14.  Tadashi Ichikawa (2 out of 4 patents)

15.  Yoshinori Maehira (2 out of 2 patents)


Core Competencies:
Exhaust Purification
Catalyst
Oil Separator
Heat Exchanger
Nitrogen Oxide Removal
Muffling Structure
Air Cleaner
Particulate Filter
Plasma Reactor
Gas Filter
Exhaust Emission Control
Oil Mist Separator

38 patents:

1. 12312988 - Exhaust purification apparatus (2025-05-27),
2. 12116921 - Mixing device (2024-10-15),
3. 11401850 - Exhaust gas purification catalyst (2022-08-02),
4. 10953410 - Separation disk and oil separator (2021-03-23),
5. 10913076 - Oil separator (2021-02-09),
6. 10767605 - Heat exchanger (2020-09-08),
7. 10569206 - Oil separator (2020-02-25),
8. 10519827 - Oil mist filter and oil separator (2019-12-31),
9. 10513955 - Oil separator (2019-12-24),
10. 10512864 - Oil separator (2019-12-24),
11. 10450916 - Plasma reactor (2019-10-22),
12. 10322362 - Oil separator (2019-06-18),
13. 10226725 - Oil mist separation method and oil separator (2019-03-12),
14. 9987579 - Oil separator (2018-06-05),
15. 9677507 - Oil separator (2017-06-13),
Company Overview
Tokyo Roki Co., Ltd. is a prominent Japanese company specializing in the development and manufacturing of advanced filtration systems and environmental control technologies. The organization focuses on providing innovative solutions for air and water purification, catering to various industries including electronics, pharmaceuticals, and food processing. With a commitment to sustainability, Tokyo Roki leverages cutting-edge research to enhance product efficiency and environmental impact, positioning itself as a leader in the filtration technology sector.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Nov 3 2026

38 Patents

#73 in Kanagawa

#2,028 in Japan

#17,876 in the World

Kanagawa, JP
Kanagawa, Japan

Tokyo Roki Co., Ltd.

Forward Citations = 278

87 inventors:

goldMedal Kosaku Ishida (12 out of 12 patents)

silverMedal Yoshitaka Watanabe (5 out of 10 patents)

bronzeMedal Isamu Kanaya (5 out of 6 patents)

4.  Takatsugu Kurosawa (4 out of 4 patents)

5.  Takayuki Mori (3 out of 5 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Tokyo Roki Co., Ltd.. Retrieved from https://idiyas.com/company/tokyo-roki-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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