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For the Inventor, By the Inventor

Narashino, Japan

Tetsuhito Yoneyama

This inventor holds 10 USPTO granted patents. Top assignee: Tdk Corporation. Active years: 1989-1999.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tetsuhito Yoneyama. Retrieved from https://idiyas.com/inventor/tetsuhito-yoneyama

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

USPTO Granted Patents = 10

% Patents Active = 100.0

Average Co-Inventor Count = 3.4

ph-index = 7

Forward Citations = 180(Granted Patents)


Location History:

  • Narashino, JP (1989 - 1999)
  • Chiba, JP (1993 - 1999)

Company Filing History:

goldMedal10 out of 8,257 
 
Tdk Corporation
 patents

Years Active: 1989-1999

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10 patents (USPTO):Explore Patents
1. 5993939 - Method for preparing permanent magnet material, chill roll, permanent (1999-11-30),
2. 5916376 - Preparation of magnet (1999-06-29),
3. 5750044 - Magnet and bonded magnet (1998-05-12),
4. 5665177 - Method for preparing permanent magnet material, chill roll, permanent (1997-09-09),
5. 5309977 - Permanent magnet material and method for making (1994-05-10),
6. 5229219 - Magnetic recording medium comprising a magnetic layer containing a (1993-07-20),
7. 5209789 - Permanent magnet material and method for making (1993-05-11),
8. 5049208 - Permanent magnets (1991-09-17),
9. 5022939 - Permanent magnets (1991-06-11),
10. 4836868 - Permanent magnet and method of producing same (1989-06-06),

Title: **Innovative Contributions of Tetsuhito Yoneyama**

Introduction

Tetsuhito Yoneyama is a prominent inventor based in Narashino, Japan, who has made significant contributions in the field of permanent magnet materials. With a portfolio of 10 patents, his innovations focus on enhancing the performance and manufacturing techniques of magnetic products.

Latest Patents

Yoneyama’s latest patents include a method for preparing permanent magnet material and a novel chill roll design. His innovative approach involves cooling a molten alloy that contains rare earth elements such as R, which is a critical component of his patented materials. The chill roll features a series of circumferential grooves, ensuring a consistent cooling rate. This meticulous design minimizes variations in crystal grain diameter, resulting in a stable performance of the permanent magnet material. His inventions aim to provide cost-effective magnets with high coercivity and energy output by utilizing specific compositions of rare earth elements along with other compounds.

Career Highlights

Throughout his career, Tetsuhito Yoneyama has been affiliated with TDK Corporation, where his work has significantly influenced the development of advanced magnetic materials. His innovative methods not only improve the quality of magnets but also enhance manufacturing efficiency.

Collaborations

Yoneyama's research has benefited from collaborative efforts with fellow scientists and inventors, including Akira Fukuno and Osamu Kohmoto. Together, they have worked on various projects that push the boundaries of magnet technology and contribute to ongoing advancements in the industry.

Conclusion

Tetsuhito Yoneyama’s inventive prowess in the field of permanent magnets underscores his role as a notable figure in material science. His commitment to innovation is reflected in his numerous patents, paving the way for future breakthroughs in magnetic technology. As the industry continues to evolve, the impact of his work will undoubtedly resonate in the advancements that follow.

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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