Yujiro Umezawa

This inventor holds 11 USPTO granted patents and 3 published patent applications. Top assignees: Bridgestone Corporation, Bridgestone Tire Company Limited. Active years: 1984-1997.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yujiro Umezawa. Retrieved from https://idiyas.com/inventor/yujiro-umezawa

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

USPTO Granted Patents = 11 (Patent Applications = 3)

% Patents Active = 100.0

Average Co-Inventor Count = 1.4

ph-index = 6

Forward Citations = 95(Granted Patents)

Location History:

Higashimurayama, JP (1984)
Tokyo, JP (1986 - 1997)

Company Filing History:

9 out of 5,194

Bridgestone Corporation

patents

2 out of 504

Bridgestone Tire Company Limited

patents

Years Active: 1984-1997

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11 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5647928 - Heavy duty pneumatic tires with reduced belt weight (1997-07-15),

2. 5526864 - Steel cords for rubber reinforcement and pneumatic radial tires using (1996-06-18),

3. 5520233 - Heavy duty pneumatic tires with reduced belt weight (1996-05-28),

4. 5400580 - Steel cords for rubber reinforcement and pneumatic radial tires using (1995-03-28),

5. 5050657 - Pneumatic tire with steel cords having a closed twisted structure or a (1991-09-24),

6. 4966216 - Heavy duty radial tires with metallic carcass ply (1990-10-30),

7. 4917165 - Steel cords for the reinforcement of rubber articles (1990-04-17),

8. 4788815 - Steel cords for the reinforcement of rubber articles (1988-12-06),

9. 4707975 - Steel cords for the reinforcement of rubber articles (1987-11-24),

10. 4572264 - Pneumatic radial tires (1986-02-25),

11. 4488587 - Pneumatic radial tires (1984-12-18),

Title: Yujiro Umezawa: Innovator in Tire Technology

Introduction

Yujiro Umezawa is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of tire technology, holding a total of 11 patents. His innovative designs have advanced the performance and efficiency of pneumatic tires.

Latest Patents

One of Umezawa's latest patents is for heavy-duty pneumatic tires with reduced belt weight. This design features a radial carcass and a belt made up of at least three layers. The first belt layer contains cords inclined at a large angle, while the second and third layers have cords inclined at smaller angles, crossed with each other. The first layer is made of steel cords with a specific structure, while the second and third layers consist of steel cords twisted around a core filament. Another notable patent involves a steel cord for the reinforcement of the carcass of a pneumatic radial tire. This cord comprises a central basic layer and a coaxial layer of twisted steel filaments, enhancing the tire's durability and performance.

Career Highlights

Umezawa has worked with leading companies in the tire industry, including Bridgestone Corporation and Bridgestone Tire Company Limited. His experience in these organizations has allowed him to develop and refine his innovative tire technologies.

Collaborations

Throughout his career, Umezawa has collaborated with notable professionals in the field, including Kiyohito Kawasaki and Yoshinori Kuriya. These partnerships have contributed to the advancement of tire technology and innovation.

Conclusion

Yujiro Umezawa's contributions to tire technology through his patents and collaborations have made a significant impact on the industry. His work continues to influence the design and performance of pneumatic tires, showcasing his role as a leading inventor in this field.

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]

3 patents pending: