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Polyplastics Co., Ltd.

USPTO Granted Patents = 381

% Expired Patents = 10.0

CIPO Patents = 3

EPO Patents = 68

Trademarks = 12

Forward Citations = 3,121

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288 inventors (with patents filed for the assignee):

Kenji Hijikata (59 out of 61 patents)

Toshio Nakane (38 out of 39 patents)

Yukihiko Kageyama (29 out of 29 patents)

4. Hatsuhiko Harashina (19 out of 20 patents)

5. Katsuhiko Takahashi (18 out of 20 patents)

6. Kaoru Yamamoto (16 out of 34 patents)

7. Yoshihisa Tajima (16 out of 16 patents)

8. Hiroaki Konuma (15 out of 15 patents)

9. Yukio Ikenaga (15 out of 18 patents)

10. Hajime Serizawa (14 out of 14 patents)

11. Tomohiro Monma (13 out of 13 patents)

12. Haruji Murakami (13 out of 15 patents)

13. Toshio Kanoe (13 out of 17 patents)

14. Yoshiharu Suzuki (13 out of 13 patents)

15. Kuniaki Kawaguchi (12 out of 12 patents)

Core Competencies:

Polyacetal Resin

Automobile Parts

Flame-Retardant

Thermoplastic Resin

Molded Article

Vibration-Damping

Polyarylene Sulfide

Cyclic Olefin Copolymer

Resin Composition

Sliding Member

Dust-Resistant

Integrated Molded Product

381 patents: Sort by Forward Citations

1. 12384078 - Casing member for in-vehicle camera and method of manufacturing the same (2025-08-12),

2. 12305034 - Automobile interior component made from polyacetal resin (2025-05-20),

3. 12257786 - Molded article for laser welding, and agent for suppressing variation in laser transmittance of molded article for laser welding (2025-03-25),

4. 12139601 - Method for improving tracking resistance of thermoplastic resin (2024-11-12),

5. 12043737 - Vibration-damping molded article and method for producing resin composition for vibration-damping molded article (2024-07-23),

6. 12037487 - Polyacetal resin composition and automobile part (2024-07-16),

7. 11932730 - Polyarylene sulfide resin composition, molded article, and optical ferrule (2024-03-19),

8. 11891504 - Polyacetal resin composition and automobile part (2024-02-06),

9. 11795256 - Production method for cyclic olefin copolymer and catalyst composition for copolymerization of norbornene monomer and ethylene (2023-10-24),

10. 11697232 - Metal resin composite-molded article and method for manufacturing same (2023-07-11),

11. 11661511 - Production method of polyacetal resin composition (2023-05-30),

12. 11634576 - Polyacetal resin composition (2023-04-25),

13. 11607868 - Ratchet stack (2023-03-21),

14. 11555111 - Polyacetal resin composition (2023-01-17),

15. 11426903 - Powdery liquid-crystal resin for press-molded article, press-molded article, and production method therefor (2022-08-30),

Company Overview

Polyplastics Co., Ltd., headquartered in Tokyo, Japan, specializes in the development and manufacturing of advanced polymer materials, particularly polyacetal resin compositions. The company's expertise extends to various applications, including automotive parts, where their flame-retardant and thermoplastic resins play a crucial role in enhancing safety and performance. Additionally, Polyplastics is known for its innovations in vibration-damping materials and other high-performance polymers, contributing significantly to industries that demand durability and reliability.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

381 Patents

#226 in Tokyo

#452 in Japan

#2,432 in the World

Polyplastics Co., Ltd.

Forward Citations = 3,121

288 inventors:

Kenji Hijikata (59 out of 61 patents)

Toshio Nakane (38 out of 39 patents)

Yukihiko Kageyama (29 out of 29 patents)

4. Hatsuhiko Harashina (19 out of 20 patents)

5. Katsuhiko Takahashi (18 out of 20 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Polyplastics Co., Ltd.. Retrieved from https://idiyas.com/company/polyplastics-company

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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