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For the Inventor, By the Inventor

Isehara, Japan

Hiroshi Hirakawa

This inventor holds 13 USPTO granted patents. Top assignees: The Yokohama Rubber Co., Ltd., Nippon Zeon Company, Ltd.. Active years: 1977-1995.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hiroshi Hirakawa. Retrieved from https://idiyas.com/inventor/hiroshi-hirakawa

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 13

% Patents Active = 100.0

Average Co-Inventor Count = 2.7

ph-index = 7

Forward Citations = 112(Granted Patents)


Location History:

  • Isehara, JA (1977)
  • Isehara, JP (1982 - 1995)

Company Filing History:

goldMedal13 out of 2,770 
 
The Yokohama Rubber Co., Ltd.
 patents
silverMedal1 out of 598 
 
Nippon Zeon Company, Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1977-1995

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13 patents (USPTO):Explore Patents
1. 5405690 - Rubber-rubber bonded composite structure (1995-04-11),
2. 5370915 - Rubber-rubber bonded composite structure (1994-12-06),
3. 5264259 - Energy absorbing structure (1993-11-23),
4. 5236030 - Pneumatic tire with inner liner of ultra high molecular weight (1993-08-17),
5. 4748168 - Rubber compositions for tire treads (1988-05-31),
6. 4396052 - Radial tire (1983-08-02),
7. 4342670 - Process for preparing rubber compositions for tire treads (1982-08-03),
8. 4323485 - Rubber compositions for tire treads having low rolling resistance (1982-04-06),
9. 4321168 - Process for preparing rubber composition for tire treads (1982-03-23),
10. 4309318 - Tread compositions for tires having low rolling resistance (1982-01-05),
11. 4026878 - Vulcanization accelerator system for rubber compositions (1977-05-31),
12. 4026877 - Vulcanization accelerator system for rubber compositions (1977-05-31),
13. 4020252 - Vulcanization accelerator system for rubber compositions (1977-04-26),

Title: The Innovations of Hiroshi Hirakawa

Introduction

Hiroshi Hirakawa is a notable inventor based in Isehara, Japan, recognized for his contributions to the field of rubber technology. With a total of 13 patents to his name, he has made significant advancements in the development of rubber-rubber bonded composite structures. His work has had a lasting impact on various industries that utilize rubber materials.

Latest Patents

Hirakawa's latest patents focus on a rubber-rubber bonded composite structure. This innovative structure consists of one unvulcanized preform made from hydrogenated acrylonitrile-butadiene rubber, combined with either methacrylic acid and zinc oxide or zinc methacrylate, along with an organic peroxide. Additionally, another unvulcanized preform is formed from a commonly used rubber composition. Both preforms are laminated together into an integrally bonded structure through vulcanization, resulting in excellent rubber-to-rubber adhesion.

Career Highlights

Throughout his career, Hirakawa has worked with prominent companies such as The Yokohama Rubber Co., Ltd. and Nippon Zeon Company, Ltd. His experience in these organizations has allowed him to refine his expertise in rubber technology and contribute to various innovative projects.

Collaborations

Hirakawa has collaborated with notable coworkers, including Asahiro Ahagon and Makoto Misawa. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies in the rubber industry.

Conclusion

Hiroshi Hirakawa's contributions to rubber technology through his patents and collaborations have significantly advanced the field. His innovative work continues to influence the industry and inspire future developments in rubber materials.

Profile summary based on public USPTO records.
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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