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Tonen Corporation

USPTO Granted Patents = 141

CIPO Patents = 1

Forward Citations = 1,887

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262 inventors (with patents filed for the assignee):

Hirotaka Tomizawa (13 out of 29 patents)

Satoshi Ueki (12 out of 32 patents)

Hiroyuki Furuhashi (10 out of 34 patents)

4. Takeshi Isoda (9 out of 25 patents)

5. Toshiaki Kuribayashi (8 out of 12 patents)

6. Hiroshi Ueno (7 out of 71 patents)

7. Makoto Kanbara (7 out of 8 patents)

8. Osamu Funayama (7 out of 20 patents)

9. Hiroshi Inoue (7 out of 42 patents)

10. Makoto Takezawa (7 out of 7 patents)

11. Makoto Saito (7 out of 7 patents)

12. Yasuo Shimizu (6 out of 221 patents)

13. Yuji Fujita (6 out of 14 patents)

14. Masahide Murata (6 out of 20 patents)

15. Kazuo Hirano (6 out of 23 patents)

Core Competencies:

Hydrotreating Catalyst

Lubricant Composition

Diesel Fuel Oil

Hydrogenation Treatment

Ceramic Formation

Polysilazane

Electrorheological Fluid

Reinforcing Fiber Sheet

High-Octane Gasoline

Carbon Fiber Composite

Organic Solvent-Resistant Microorganisms

141 patents: Sort by Forward Citations

1. 6576584 - Method for producing hydrotreating catalyst (2003-06-10),

2. 6511933 - Catalyst for cracking heavy oil (2003-01-28),

3. 6436870 - Hydrotreating catalyst for hydrotreating hydrocarbon oils (2002-08-20),

4. 6383688 - Electrolyte for lithium cells and method of producing the same (2002-05-07),

5. 6310168 - Aminated polysilazane and process for the preparation thereof (2001-10-30),

6. 6306289 - Catalyst for hydrogenation treatment and method for hydrogenation treatment of hydrocarbon oil (2001-10-23),

7. 6245719 - Lubricant oil composition (2001-06-12),

8. 6215034 - Base fuel oil for diesel fuel oil and diesel fuel oil composition comprising the same (2001-04-10),

9. 6207625 - Lubricant oil composition for diesel engines (LAW913) (2001-03-27),

10. 6191080 - Heat resistant lubricating oil composition (2001-02-20),

11. 6187171 - Unleaded high-octane gasoline composition (2001-02-13),

12. 6184185 - Lubricant oil composition comprising borated cyclic carboxylic acid imide (2001-02-06),

13. 6147035 - Lubricating oil composition containing overbased metal salicylate, amine (2000-11-14),

14. 6140283 - Lubricant oil composition for internal combustion engines (2000-10-31),

15. 6136050 - Diesel fuel oil composition (2000-10-24),

Company Overview

Tonen Corporation, headquartered in Tokyo, Japan, specializes in hydrocarbon processing technologies. The company focuses on the development and manufacturing of advanced materials and catalysts, particularly in areas such as hydrotreating catalysts and lubricant compositions. Its expertise extends to diesel fuel oil treatment, hydrogenation processes, and innovative materials like polysilazane and electrorheological fluids. Tonen is committed to enhancing performance and sustainability in various industrial applications through its cutting-edge research and development initiatives.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

141 Patents

#440 in Tokyo

#895 in Japan

#5,756 in the World

Tonen Corporation

Forward Citations = 1,887

262 inventors:

Hirotaka Tomizawa (13 out of 29 patents)

Satoshi Ueki (12 out of 32 patents)

Hiroyuki Furuhashi (10 out of 34 patents)

4. Takeshi Isoda (9 out of 25 patents)

5. Toshiaki Kuribayashi (8 out of 12 patents)

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

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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