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For the Inventor, By the Inventor

Tokyo, Japan

Prime Polymer Co., Ltd.


USPTO Granted Patents = 52

% Expired Patents = 25.0



Forward Citations = 77

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119 inventors (with patents filed for the assignee):

goldMedal Keita Itakura (7 out of 13 patents)

silverMedal Satoshi Tamura (7 out of 15 patents)

bronzeMedal Ryoichi Tsunori (5 out of 12 patents)

4.  Minoru Sugawara (5 out of 13 patents)

5.  Tatsuji Kawamura (4 out of 5 patents)

6.  Hirofumi Goda (4 out of 4 patents)

7.  Katsutoshi Ohta (3 out of 3 patents)

8.  Rikuo Onishi (3 out of 5 patents)

9.  Satoshi Hashizume (3 out of 4 patents)

10.  Jun Birukawa (3 out of 3 patents)

11.  Toru Iwashita (3 out of 3 patents)

12.  Yoshio Sugimoto (3 out of 5 patents)

13.  Yasuhiko Otsuki (3 out of 3 patents)

14.  Tomoyuki Obara (3 out of 8 patents)

15.  Ikunori Sakai (3 out of 21 patents)


Core Competencies:
Injection-Molded Article
Multilayer Polypropylene Film
Resin Composition
Fiber-Reinforced Resin
Polypropylene Homopolymer
Thermal Sterilization Packaging
Foamed Molded Body
Automotive Parts
Biaxially-Stretched Film
Sound Absorbing Structure
Capacitor Film
Expansion Injection Molding

52 patents:

1. 12503582 - Injection-molded article for medical use (2025-12-23),
2. 12384908 - Multilayer polypropylene film for capacitor (2025-08-12),
3. 12344731 - Propylene polymer composition and shaped article (2025-07-01),
4. 12202233 - Laminates and liquid packaging bags (2025-01-21),
5. 11873392 - Polypropylene-based resin composition (2024-01-16),
6. 11434356 - Propylene-based resin composition (2022-09-06),
7. 11359082 - Polypropylene-based resin composition and molded article (2022-06-14),
8. 11292899 - Propylene-based polymer, method for producing the same, propylene-based resin composition and molded article (2022-04-05),
9. 11020885 - Polypropylene-based foamed molded body and manufacturing method of polypropylene-based foamed molded body (2021-06-01),
10. 10858507 - Fiber-reinforced polypropylene-based resin composition and molded product thereof (2020-12-08),
11. 10800909 - Propylene homopolymer composition for capacitor film, method for producing the same, and capacitor film (2020-10-13),
12. 10793708 - Propylene homopolymer composition for capacitor film, method for producing the same, and capacitor film (2020-10-06),
13. 10619039 - Polypropylene resin composition and use thereof (2020-04-14),
14. 10457786 - Biaxially-stretched film and ethylene polymer composition (2019-10-29),
15. 10370465 - Propylene homopolymer for stress-resistant molded article, composition containing the polymer, and stress-resistant molded articles obtained therefrom (2019-08-06),
Company Overview
Prime Polymer Co., Ltd., headquartered in Tokyo, specializes in advanced polypropylene resin technology. The company focuses on the development and manufacturing of a diverse range of products, including injection-molded articles, multilayer polypropylene films, and fiber-reinforced resins. Their expertise extends to thermal sterilization packaging and foamed molded bodies, catering to various industries such as automotive. Prime Polymer is committed to innovation in resin composition and applications, enhancing performance and sustainability in material usage.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

52 Patents

#783 in Tokyo

#1,672 in Japan

#13,571 in the World

Tokyo, JP
Tokyo, Japan

Prime Polymer Co., Ltd.

Forward Citations = 77

119 inventors:

goldMedal Keita Itakura (7 out of 13 patents)

silverMedal Satoshi Tamura (7 out of 15 patents)

bronzeMedal Ryoichi Tsunori (5 out of 12 patents)

4.  Minoru Sugawara (5 out of 13 patents)

5.  Tatsuji Kawamura (4 out of 5 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Prime Polymer Co., Ltd.. Retrieved from https://idiyas.com/company/prime-polymer-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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