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For the Inventor, By the Inventor

Tokyo, Japan

Kureha Corporation


USPTO Granted Patents = 335

% Expired Patents = 45.1



Trademarks = 32

Forward Citations = 1,496

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378 inventors (with patents filed for the assignee):

goldMedal Naohiro Sonobe (27 out of 42 patents)

silverMedal Hiroyuki Sato (26 out of 40 patents)

bronzeMedal Hiroshi Sakabe (24 out of 24 patents)

4.  Michihisa Miyahara (24 out of 26 patents)

5.  Hiroyuki Sato (24 out of 82 patents)

6.  Takeo Takahashi (23 out of 51 patents)

7.  Kazuyuki Yamane (20 out of 25 patents)

8.  Kenji Suzuki (19 out of 141 patents)

9.  Fuminori Kobayashi (19 out of 19 patents)

10.  Masayuki Okura (17 out of 19 patents)

11.  Yasuhiro Tada (15 out of 22 patents)

12.  Yoshinori Suzuki (14 out of 160 patents)

13.  Taiji Miyake (12 out of 12 patents)

14.  Toru Yamazaki (12 out of 49 patents)

15.  Akihiro Konno (11 out of 16 patents)


Core Competencies:
Polyarylene Sulfide
Non-Aqueous Electrolyte Battery
Downhole Tools
Binder Composition
Molded Article
Vinylidene Fluoride
Electrode Mixture
Production Method
Degradable Materials
Aromatic Polymers
Compound Production
Cyclic Polysilane

335 patents:

1. 12744218 - Vinylidene fluoride copolymer composition and method for producing same, polymer dispersion solution, electrode for nonaqueous electrolyte secondary battery, electrolyte layer for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery (2026-09-22),
2. 12734279 - Bioabsorbable medical material (2026-09-15),
3. 12723154 - Downhole tool or member thereof containing polyglycolic acid (2026-09-01),
4. 12712186 - VINYLIDENE FLUORIDE COPOLYMER COMPOSITION AND METHOD FOR PRODUCING SAME, POLYMER DISPERSION SOLUTION, ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, ELECTROLYTE LAYER FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY (2026-08-18),
5. 12666876 - Transparent conductive piezoelectric film and touch panel (2026-06-23),
6. 12584370 - Molded product and processed article (2026-03-24),
7. 12552901 - Polyarylene sulfide production method (2026-02-17),
8. 12509555 - Method for producing polyarylene sulfide (2025-12-30),
9. 12482803 - Production method for electrode member (2025-11-25),
10. 12460505 - Frac plug and method for manufacturing same, and method for sealing borehole (2025-11-04),
11. 12428387 - Method for producing compound (2025-09-30),
12. 12345118 - Downhole plug device, tube affixing method, and tube inspection method (2025-07-01),
13. 12207654 - Bactericidal agent for agricultural or horticultural use, plant disease control method, and product for plant disease control use (2025-01-28),
14. 12110758 - Downhole tool securing device and frac plug (2024-10-08),
15. 12065902 - Frac plug and method for manufacturing same, and method for sealing borehole (2024-08-20),
Kureha Corporation, headquartered in Tokyo, Japan, specializes in the production of polyarylene sulfide, a high-performance thermoplastic known for its chemical resistance and thermal stability. The company is engaged in advanced research and development across various technology domains, including non-aqueous electrolyte batteries, downhole tools, and binder compositions. Kureha's innovative approaches extend to molded articles and electrode mixtures, positioning it as a key player in materials science and engineering.
Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

Kureha Corporation
335 Patents

#255 in Tokyo

#499 in Japan

#2,693 in the World

Tokyo, JP
Tokyo, Japan

Kureha Corporation

Forward Citations = 1,496

378 inventors:

goldMedal Naohiro Sonobe (27 out of 42 patents)

silverMedal Hiroyuki Sato (26 out of 40 patents)

bronzeMedal Hiroshi Sakabe (24 out of 24 patents)

4.  Michihisa Miyahara (24 out of 26 patents)

5.  Hiroyuki Sato (24 out of 82 patents)

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