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Tonen Sekiyukagaku Kabushiki Kaisha

USPTO Granted Patents = 17

CIPO Patents = 1

Forward Citations = 239

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54 inventors (with patents filed for the assignee):

Takashi Mikami (7 out of 27 patents)

Kiyotada Narukawa (5 out of 8 patents)

Seiji Kagawa (4 out of 46 patents)

4. Hiroyuki Wakabayashi (4 out of 15 patents)

5. Kissho Kitano (4 out of 4 patents)

6. Kunio Iwanami (4 out of 4 patents)

7. Fumio Kato (4 out of 7 patents)

8. Yukihiko Yagi (3 out of 4 patents)

9. Hideaki Toda (3 out of 3 patents)

10. Masato Sakuma (3 out of 3 patents)

11. Masami Esaki (3 out of 3 patents)

12. Koji Egashira (3 out of 3 patents)

13. Takao Nomura (2 out of 51 patents)

14. Noboru Yamamoto (2 out of 45 patents)

15. Kenichi Aoki (2 out of 4 patents)

17 patents: Sort by Forward Citations

1. 5252385 - Elastomer film and composite containing same (1993-10-12),

2. 5216054 - Polymer composition (1993-06-01),

3. 5153060 - Resin composition for adhering polyarylene sulfide and polyvinylidene (1992-10-06),

4. 5106909 - Modified polyolefin-polyester graft copolymer, method of producing same (1992-04-21),

5. 5106893 - Fiber-reinforced polymer composition (1992-04-21),

6. 5106564 - Method of and apparatus for making fiber-reinforced polymer compositions (1992-04-21),

7. 5057252 - Method of producing heat-resistant and shape memory formed products (1991-10-15),

8. 5021504 - Thermoplastic polyolefin-polycarbonate composition (1991-06-04),

9. 4990550 - Fiber-reinforced polymer composition and method of producing same (1991-02-05),

10. 4960823 - Resin composition for bumpers (1990-10-02),

11. 4945127 - Polymer composition, its heat-resistant, shape memory formed product and (1990-07-31),

12. 4914163 - Process for preparing heterocyclic copolymers (1990-04-03),

13. 4878974 - Method of producing a gas-permeable, waterproof composite sheet (1989-11-07),

14. 4839029 - Process for removing arsenic from a petroleum fraction (1989-06-13),

15. 4833181 - Polyolefin composition containing cellulose fibers and a deodorizer (1989-05-23),

Tonen Sekiyukagaku Kabushiki Kaisha, also known as Tonen Seki, is a leading Japanese company specializing in oil and petrochemical products. Established in 1928, the company has a long history of providing high-quality products and services to customers worldwide. With a strong commitment to sustainability and innovation, Tonen Seki continues to be a trusted partner in the energy industry.

This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Jan 6 2026

17 Patents

#1,260 in Tokyo

#3,159 in Japan

#34,876 in the World

Tonen Sekiyukagaku Kabushiki Kaisha

Forward Citations = 239

54 inventors:

Takashi Mikami (7 out of 27 patents)

Kiyotada Narukawa (5 out of 8 patents)

Seiji Kagawa (4 out of 46 patents)

4. Hiroyuki Wakabayashi (4 out of 15 patents)

5. Kissho Kitano (4 out of 4 patents)

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