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For the Inventor, By the Inventor

Tokyo, Japan

Inpex Corporation


USPTO Granted Patents = 73

% Expired Patents = 46.6



Forward Citations = 47

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67 inventors (with patents filed for the assignee):

goldMedal Yuichi Tanaka (19 out of 36 patents)

silverMedal Kazuhiko Tasaka (19 out of 19 patents)

bronzeMedal Yasuhiro Onishi (18 out of 18 patents)

4.  Eiichi Yamada (13 out of 34 patents)

5.  Marie Iwama (11 out of 18 patents)

6.  Kenichi Kawazuishi (10 out of 14 patents)

7.  Yuzuru Kato (10 out of 13 patents)

8.  Atsushi Murata (7 out of 17 patents)

9.  Fuyuki Yagi (7 out of 15 patents)

10.  Yasumasa Morita (5 out of 7 patents)

11.  Takuya Niitsuma (5 out of 8 patents)

12.  Shuhei Wakamatsu (4 out of 12 patents)

13.  Tomoyuki Mikuriya (4 out of 7 patents)

14.  Shinya Arai (3 out of 5 patents)

15.  Hidekatsu Honda (3 out of 3 patents)


Core Competencies:
Hydrocarbon Production
Catalyst Recovery
Synthesis Gas
Fischer-Tropsch
Reactor Control
Hydrotreating
Nano Silica
Diesel Fuel
Crude Oil Recovery
Corrosion Inhibitors
Liquid Hydrocarbons
Gas Separation

73 patents:

1. 12331247 - Silica nanoparticles for crude oil recovery using carbon dioxide, and crude oil recovery method (2025-06-17),
2. 11834608 - Silica nanoparticles for crude oil recovery using carbon dioxide, and crude oil recovery method (2023-12-05),
3. 11078576 - Corrosion inhibitor, well, pipeline, and method for forming anticorrosion film (2021-08-03),
4. 10076773 - Method for washing reactor (2018-09-18),
5. 10059932 - Mutant of cellulase-producing microorganism, production method of cellulase and production method of cello-oligosaccharide (2018-08-28),
6. 9920256 - Hydrocarbon compound distillation separation apparatus (2018-03-20),
7. 9884998 - Method of suppressing metal contamination of synthesis gas production apparatus (2018-02-06),
8. 9845435 - Diesel fuel or diesel fuel base stock and production method thereof (2017-12-19),
9. 9839904 - Method for producing hydrogenation catalyst (2017-12-12),
10. 9776160 - Catalyst recovery system, hydrocarbon synthesis reaction apparatus, hydrocarbon synthesis reaction system, and catalyst recovery process (2017-10-03),
11. 9725665 - Kerosene base material production method and kerosene base material (2017-08-08),
12. 9725656 - Method of suppressing metal contamination of synthesis gas production apparatus (2017-08-08),
13. 9688918 - Hydrocarbon synthesis reaction apparatus (2017-06-27),
14. 9688917 - Hydrocarbon-producing apparatus and hydrocarbon-producing method (2017-06-27),
15. 9513051 - Method for recovering hydrocarbon compounds and a hydrocarbon recovery apparatus from a gaseous by-product (2016-12-06),
Company Overview
Inpex Corporation, headquartered in Tokyo, Japan, is a leading company in the field of hydrocarbon synthesis. The organization specializes in various aspects of hydrocarbon production, focusing on advanced technologies such as catalyst recovery, synthesis gas production, and the Fischer-Tropsch process. Inpex is also engaged in reactor control and hydrotreating, contributing to the development of cleaner fuels. With expertise in nano silica and diesel fuel technologies, Inpex plays a significant role in the energy sector, driving innovation and sustainability.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

Inpex Corporation USPTO Patent Assignee Logo
73 Patents

#661 in Tokyo

#1,380 in Japan

#10,273 in the World

Tokyo, JP
Tokyo, Japan

Inpex Corporation

Forward Citations = 47

67 inventors:

goldMedal Yuichi Tanaka (19 out of 36 patents)

silverMedal Kazuhiko Tasaka (19 out of 19 patents)

bronzeMedal Yasuhiro Onishi (18 out of 18 patents)

4.  Eiichi Yamada (13 out of 34 patents)

5.  Marie Iwama (11 out of 18 patents)

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

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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