Eiichiro Ishimaru

This inventor holds 24 USPTO granted patents and 10 published patent applications, plus 1 CIPO patent and 16 EPO patents, primarily in Stainless Steel Technology. Top assignees: Nippon Steel & Sumikin Stainless Steel Corporation, Nippon Steel Corporation, Hitachi Industrial Equipment Systems Co., Ltd.. Active years: 1995-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Eiichiro Ishimaru. Retrieved from https://idiyas.com/inventor/eiichiro-ishimaru

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

USPTO Granted Patents = 24 (Patent Applications = 10)

% Patents Active = 87.5

CIPO Patents = 1

EPO Patents = 16 (Patent Applications = 18)

Average Co-Inventor Count = 4.1

ph-index = 4

Forward Citations = 51(Granted Patents)

Location History:

Hikari, JP (1995 - 2019)
Tokyo, JP (2012 - 2024)

Company Filing History:

13 out of 67

Nippon Steel & Sumikin Stainless Steel Corporation

patents

8 out of 3,711

Nippon Steel Corporation

patents

3 out of 498

Hitachi Industrial Equipment Systems Co., Ltd.

patents

4. 3 out of 37

Nippon Steel Stainless Steel Corporation

patents

5. 1 out of 1

Sumikin Stainless Steel Corporation

patent

where one patent can have more than one assignee

Years Active: 1995-2026

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Areas of Expertise:

Stainless Steel

Ferritic Sheets

Austenitic Alloys

Corrosion Resistance

High-Purity Materials

Welding Techniques

Solar Cell Substrate

Thermal Expansion

Impact Absorption

Electrical Steel

Continuous Casting

Manufacturing Processes

24 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12723296 - Austenite stainless steel material, method for producing same, and plate spring (2026-09-01),

2. 12091578 - Clear-coated stainless steel sheet (2024-09-17),

3. 11946126 - Welded structure and storage tank (2024-04-02),

4. 10513763 - Ferritic stainless steel plate which has excellent ridging resistance and method of production of same (2019-12-24),

5. 10513747 - Ferritic stainless steel sheet exhibiting small increase in strength after aging heat treatment, and method of producing the same (2019-12-24),

6. 10358707 - Ferritic stainless steel plate which has excellent ridging resistance and method of production of same (2019-07-23),

7. 10358689 - Method of producing ferritic stainless steel sheet (2019-07-23),

8. 9938598 - High-purity ferritic stainless steel sheet with excellent oxidation resistance and high-temperature strength, and process for producing the same (2018-04-10),

9. 9837567 - Stainless steel substrate for solar cell having superior insulating properties and low thermal expansion coefficient and method of producing the same (2017-12-05),

10. 9771640 - Ferritic stainless steel plate which has excellent ridging resistance and method of production of same (2017-09-26),

11. 9289964 - High purity ferritic stainless steel sheet excellent in corrosion resistance and anti-glare property (2016-03-22),

12. 8721960 - High-purity ferritic stainless steels excellent in corrosion resistance and method of production of same (2014-05-13),

13. 8432244 - Power distribution transformer and tank therefor (2013-04-30),

14. 8303733 - Ferrite-austenite stainless steel sheet for structural component excellent in workability and impact-absorbing property and method for producing the same (2012-11-06),

15. 8226780 - Ferrite-austenite stainless steel sheet excellent in ridging resistance and workability and process for manufacturing the same (2012-07-24),

Title: Eiichiro Ishimaru: Innovator in Ferritic Stainless Steel

Introduction

Eiichiro Ishimaru is a prominent inventor hailing from Hikari, Japan, with an impressive portfolio of 21 patents to his name. His work primarily focuses on the development of ferritic stainless steel, a material known for its corrosion resistance and strength. Ishimaru's innovations are significant in various industrial applications, particularly for durable consumer goods.

Latest Patents

Two of Ishimaru's latest patents highlight his expertise in stainless steel technology. The first patent pertains to a ferritic stainless steel sheet that exhibits a minimal increase in strength after undergoing aging heat treatment. This steel sheet is characterized by specific compositions, including a maximum of 0.020% carbon, between 10.0% to 25.0% chromium, and several other alloying elements to meet a critical equation for stress values after treatment.

The second patent revolves around a Cr-containing ferritic stainless steel sheet aimed at enhancing corrosion resistance and ridging resistance. This innovation utilizes a unique relationship between the γ-phase rate and tin content to achieve a dual-phase structure during hot rolling processes, ensuring that the resulting material is suitable for general consumer durable goods while providing excellent mechanical properties.

Career Highlights

Throughout his career, Ishimaru has made significant contributions to the field of material science while working with leading companies such as Nippon Steel & Sumikin Stainless Steel Corporation and Nippon Steel Corporation. His expertise in developing high-performance materials has established him as a key figure in the advancement of stainless steel technology.

Collaborations

Ishimaru's work has been bolstered through collaborations with esteemed colleagues, including Masaharu Hatano and Akihiko Takahashi. Together, they have advanced research and development in the field, fostering innovation that addresses the evolving demands for high-quality stainless steel products.

Conclusion

Eiichiro Ishimaru continues to be a pivotal player in the invention and innovation landscape of ferritic stainless steel. His patents reflect a deep understanding of materials science, contributing to advancements that meet both industry standards and consumer expectations. His legacy is highlighted by a dedication to excellence and collaboration within the field.

Profile summary based on public USPTO records.