Junichiro Hirasawa

This inventor holds 18 USPTO granted patents and 3 published patent applications, plus 1 CIPO patent and 7 EPO patents, primarily in Stainless Steel Development. Top assignees: Jfe Steel Corporation, Kawasaki Steel Corporation. Active years: 2001-2021.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Junichiro Hirasawa. Retrieved from https://idiyas.com/inventor/junichiro-hirasawa

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

Calculating rank

USPTO Granted Patents = 18 (Patent Applications = 3)

% Patents Active = 77.8

CIPO Patents = 1

EPO Patents = 7 (Patent Applications = 5)

Average Co-Inventor Count = 4.0

ph-index = 4

Forward Citations = 39(Granted Patents)

Location History:

Hiroshima, JP (2014)
Chiba, JP (2001 - 2019)
Tokyo, JP (2014 - 2021)

Company Filing History:

15 out of 1,973

Jfe Steel Corporation

patents

3 out of 1,256

Kawasaki Steel Corporation

patents

Years Active: 2001-2021

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Areas of Expertise:

Stainless Steel

High-Strength Sheets

Corrosion Resistance

Plasma Arc Welding

Chemical Conversion

Brake Disks

Ferritic Steel

Martensitic Steel

Mechanical Characteristics

Oxidation Resistance

18 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 10988853 - Stainless steel sheet including Ni and O-containing coating on surface and method for producing stainless steel sheet (2021-04-27),

2. 10272513 - Ferritic stainless steel sheet for plasma arc welding and welding method therefor (2019-04-30),

3. 9090952 - High-strength cold-rolled steel sheet and method for producing the same (2015-07-28),

4. 8911574 - Method for manufacturing high-Si cold rolled steel sheet having excellent chemical conversion properties (2014-12-16),

5. 8852361 - Stainless steel sheet with excellent heat and corrosion resistances for brake disk (2014-10-07),

6. 8668789 - Method for manufacturing of high strength cold rolled steel sheet of excellent phosphatability (2014-03-11),

7. 8657971 - Brake disk excellent in temper softening resistance and toughness (2014-02-25),

8. RE44709 - Soft Cr-containing steel (2014-01-20),

9. 8357247 - Martensitic stainless steel for disk brakes (2013-01-22),

10. 7572407 - Martensitic stainless steel sheet and method for making the same (2009-08-11),

11. 7429302 - Stainless steel sheet for welded structural components and method for making the same (2008-09-30),

12. 7341690 - Soft Cr-containing steel (2008-03-11),

13. 7294212 - High-strength stainless steel material in the form of a wheel rim and method for manufacturing the same (2007-11-13),

14. 6740174 - Soft Cr-containing steel (2004-05-25),

15. 6737018 - Corrosion-resistant chromium steel for architectural and civil engineering structural elements (2004-05-18),

Title: Junichiro Hirasawa: Innovator in Stainless Steel Technology

Introduction

Junichiro Hirasawa is a prominent inventor based in Chiba, Japan, known for his significant contributions to the field of stainless steel technology. With a total of 18 patents to his name, Hirasawa has developed innovative solutions that enhance the performance and durability of stainless steel products.

Latest Patents

Hirasawa's latest patents include a stainless steel sheet featuring a nickel (Ni) and oxygen (O)-containing coating on its surface. This coating provides excellent weld penetration characteristics and outstanding crevice corrosion resistance. The stainless steel sheet is designed with a coating weight ranging from 0.1 g/m to 20 g/m, with a composition that includes 25% to 60% Ni and 40% to 70% O. Another notable patent is for a ferritic stainless steel sheet specifically designed for plasma arc welding. This sheet contains minimal amounts of carbon, silicon, manganese, phosphorus, sulfur, and nitrogen, while incorporating aluminum, chromium, and optional titanium or niobium to enhance its properties.

Career Highlights

Throughout his career, Junichiro Hirasawa has worked with leading companies in the steel industry, including JFE Steel Corporation and Kawasaki Steel Corporation. His work has focused on advancing the technology and applications of stainless steel, making significant impacts in various industrial sectors.

Collaborations

Hirasawa has collaborated with notable colleagues such as Osamu Furukimi and Takumi Ujiro, contributing to the development of innovative stainless steel solutions.

Conclusion

Junichiro Hirasawa's contributions to stainless steel technology through his patents and collaborations have established him as a key figure in the field. His innovative approaches continue to influence the industry and improve the performance of stainless steel products.

Profile summary based on public USPTO records.