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Sumitomo Seika Chemicals Co., Ltd.

USPTO Granted Patents = 301

CIPO Patents = 41

EPO Patents = 208

Trademarks = 8

Forward Citations = 764

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365 inventors (with patents filed for the assignee):

Kiyoshi Nishioka (21 out of 21 patents)

Nobutaka Fujimoto (20 out of 21 patents)

Hiroshi Goda (20 out of 24 patents)

4. Shigeki Hamamoto (17 out of 18 patents)

5. Masayoshi Handa (15 out of 15 patents)

6. Hideki Yokoyama (14 out of 14 patents)

7. Junichi Takatori (14 out of 14 patents)

8. Hirokazu Kagano (14 out of 14 patents)

9. Shigeki Sakaue (13 out of 13 patents)

10. Hiroki Yabuguchi (12 out of 12 patents)

11. Shinji Kobayashi (12 out of 103 patents)

12. Masatoyo Yoshinaka (12 out of 12 patents)

13. Yasuhiro Nawata (12 out of 12 patents)

14. Katsumasa Yamamoto (11 out of 11 patents)

15. Tetsuhiro Hinayama (10 out of 10 patents)

Core Competencies:

Water Absorbent Resin

Absorbent Resin Particles

Nonaqueous Electrolyte Solutions

Biomaterial Preservation Composition

Electrical Insulating Resin

Epoxy Resin Composition

Polyalkylene Oxide

Hydrogen Sulfide Sustained Release

Binder for Secondary Battery

Aliphatic Polycarbonate

Deodorant Composition

Cosmetic

301 patents: Sort by Forward Citations

1. 12496374 - Deodorizer composition, absorbing body, and absorbent article (2025-12-16),

2. 12478952 - Method for increasing amount of water absorbed under load by water absorbent resin particles, and method for producing water absorbent resin particles (2025-11-25),

3. 12427503 - Method for producing water absorbent resin particles and aqueous monomer solution (2025-09-30),

4. 12427223 - Deodorant composition, absorbent, and absorbent article (2025-09-30),

5. 12403449 - Water-absorbing resin (2025-09-02),

6. 12359028 - Method for producing water-absorbent resin particles and water-absorbent resin particles (2025-07-15),

7. 12351692 - Absorbent resin particles and absorbent (2025-07-08),

8. 12274999 - Water absorbent resin particles, absorbent, absorbent article and liquid suction power measurement method (2025-04-14),

9. 12269010 - Water-absorbing resin and water-blocking material (2025-04-08),

10. 12263468 - Method for improving water absorption of water-absorbent resin particles under load, and method for producing water-absorbent resin particles (2025-04-01),

11. 12246303 - Water-absorbing resin particles and absorbent article (2025-03-11),

12. 12246033 - Constituent for preventing and/or treating skin wounds (2025-03-11),

13. 12215091 - Method for producing methylene disulfonate compound (2025-02-04),

14. 12195589 - Method for producing polyalkylene oxide (2025-01-14),

15. 12194436 - Water absorbent resin and water stop material (2025-01-14),

Sumitomo Seika Chemicals Co., Ltd. is a Japanese chemical company specializing in the development, production, and sales of a wide range of chemical products. With a strong focus on innovation and sustainability, Sumitomo Seika Chemicals aims to contribute to society by creating products that enhance the quality of life. Visit their website for more information.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

301 Patents

#7 in Hyogo

#526 in Japan

#2,882 in the World

Sumitomo Seika Chemicals Co., Ltd.

Forward Citations = 764

365 inventors:

Kiyoshi Nishioka (21 out of 21 patents)

Nobutaka Fujimoto (20 out of 21 patents)

Hiroshi Goda (20 out of 24 patents)

4. Shigeki Hamamoto (17 out of 18 patents)

5. Masayoshi Handa (15 out of 15 patents)

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