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Japan Styrene Paper Corporation

USPTO Granted Patents = 48

Forward Citations = 853

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55 inventors (with patents filed for the assignee):

Hideki Kuwabara (22 out of 24 patents)

Hiroyuki Akiyama (14 out of 15 patents)

Shohei Yoshimura (10 out of 10 patents)

4. Toru Yamaguchi (10 out of 10 patents)

5. Yoshimi Sudo (7 out of 7 patents)

6. Susumu Izawa (5 out of 5 patents)

7. Nobuyoshi Shimoyashiki (4 out of 4 patents)

8. Kuninori Hirosawa (4 out of 4 patents)

9. Masato Kanbe (4 out of 4 patents)

10. Masato Naito (3 out of 5 patents)

11. Shoji Iwano (3 out of 3 patents)

12. Kouichi Wakabayashi (3 out of 3 patents)

13. Hideo Hatakeyama (3 out of 3 patents)

14. Fusao Imai (3 out of 3 patents)

15. Akira Adachi (3 out of 3 patents)

Core Competencies:

Foamed Polyolefin

Polypropylene Resin

Pre-foamed Particles

Molded Articles

Production Method

Expansion-Molded

Automobile Bumper

Electrical Conductive Foam

Polyethylene Resin

Extruded Foams

Core Material

48 patents: Sort by Forward Citations

1. 5281377 - Process for the production of foamed polyolefin sheets (1994-01-25),

2. 5281119 - Apparatus for the production of foamed polyolefin sheets (1994-01-25),

3. 5015667 - Pre-foamed beads of polyethylene base resin (1991-05-14),

4. 4948817 - Pre-foamed particles of uncrosslinked, linear low-density polyethylene (1990-08-14),

5. 4889671 - Production method of prefoamed particles of polyolefin resin (1989-12-26),

6. 4840973 - Polypropylene resin prefoamed particles (1989-06-20),

7. 4822542 - Method of production of expansion-molded article, from foamable (1989-04-18),

8. 4810316 - Process for producing a foamed base material for car ceiling member (1989-03-07),

9. 4806293 - Method of producing a foamed, molded article (1989-02-21),

10. 4777000 - Production method of expansion-molded article of polypropylene resin (1988-10-11),

11. 4756948 - Core material for automobile bumpers (1988-07-12),

12. 4749725 - Production process of pre-foamed particles (1988-06-07),

13. 4716021 - Heat treatment apparatus for polyolefin resin particles (1987-12-29),

14. 4711287 - Casting method (1987-12-08),

15. 4707569 - Multi-conductor cable (1987-11-17),

Company Overview

Japan Styrene Paper Corporation, headquartered in Tokyo, specializes in the development and manufacturing of advanced materials, particularly focusing on foamed polyolefin sheets and pre-foamed particles. The company is recognized for its expertise in polypropylene resin and expansion-molded articles, catering to various industries including automotive, where it produces components such as bumpers and electrical conductive foam. With a commitment to innovation, Japan Styrene Paper Corporation plays a significant role in enhancing material performance and functionality across multiple applications.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

48 Patents

#815 in Tokyo

#1,757 in Japan

#14,561 in the World

Japan Styrene Paper Corporation

Forward Citations = 853

55 inventors:

Hideki Kuwabara (22 out of 24 patents)

Hiroyuki Akiyama (14 out of 15 patents)

Shohei Yoshimura (10 out of 10 patents)

4. Toru Yamaguchi (10 out of 10 patents)

5. Yoshimi Sudo (7 out of 7 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Japan Styrene Paper Corporation. Retrieved from https://idiyas.com/company/japan-styrene-paper

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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