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For the Inventor, By the Inventor

Hatsukaichi, Japan

Tsutomu Katamoto

This inventor holds 16 USPTO granted patents and 1 published patent application and 1 EPO patent, primarily in Magnetic Materials. Top assignees: Toda Kogyo Corporation, Dainichiseika Color & Chemicals Mfg. Co., Ltd.. Active years: 1988-2012.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tsutomu Katamoto. Retrieved from https://idiyas.com/inventor/tsutomu-katamoto

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

Calculating rank
USPTO Granted Patents = 16 

% Patents Active = 75.0

 

Average Co-Inventor Count = 2.3

ph-index = 6

Forward Citations = 81(Granted Patents)


Location History:

  • Hiroshima, JP (1988 - 2001)
  • Hatsukaichi, JP (1997 - 2008)
  • Ohtake, JP (2012)

Company Filing History:

goldMedal16 out of 390 
 
Toda Kogyo Corporation
 patents
silverMedal2 out of 265 
 
Dainichiseika Color & Chemicals Mfg. Co., Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1988-2012

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Areas of Expertise:
Spinel-Type Ferrimagnetic
Mg-Al Hydrotalcite
Heat-Resistant Pigment
Iron Oxide Coloring
Black Pigment
Coating Composition
Platelike Hematite
Electroconductive Particles
Magnetoplumbite Ferrite
Non-Magnetic Pigments
Lepidocrocite Particles
Magnetic Recording Media
16 patents (USPTO):Explore Patents
1. 8133405 - Spinel-type ferrimagnetic particles, process for producing the same, and magnetic recording medium using the same (2012-03-13),
2. 7405359 - Mg-Al-based hydrotalcite-type particles, chlorine-containing resin composition and process for producing the particles (2008-07-29),
3. 6939909 - Mg-Al-based hydrotalcite-type particles, chlorine-containing resin composition and process for producing the particles (2005-09-06),
4. 6919396 - Mg-Al-based hydrotalcite-type particles, chlorine-containing resin composition and process for producing the particles (2005-07-19),
5. 6509405 - Mg-Al-based hydrotalcite-type particles, chlorine-containing resin composition and process for producing the particles (2003-01-21),
6. 6413639 - Mg-Al based hydrotalcite-type particles, chlorine-containing resin stabilizer and process for producing the particles (2002-07-02),
7. 6200376 - Heat-resistant yellow pigment (2001-03-13),
8. 5686378 - Lamella lepidocrocite particles and process for producing the same (1997-11-11),
9. 5269842 - Iron oxide coloring agent for suppressing aging of resins (1993-12-14),
10. 5199983 - Black pigment particles (1993-04-06),
11. 5143548 - Coating composition having platelike iron oxide particles (1992-09-01),
12. 5133805 - Plate-like hematite particles, a pigment comprising the same and showing (1992-07-28),
13. 5112403 - Coating composition (1992-05-12),
14. 5009712 - Non-magnetic pigments (1991-04-23),
15. 4917952 - Electroconductive iron oxide particles (1990-04-17),

Title: Tsutomu Katamoto: Innovator in Magnetic Materials

Introduction

Tsutomu Katamoto is a prominent inventor based in Hatsukaichi, Japan. He holds a total of 16 patents, showcasing his significant contributions to the field of magnetic materials and their applications. His innovative work has led to advancements in various technologies, particularly in magnetic recording mediums.

Latest Patents

Among his latest patents, Katamoto has developed spinel-type ferrimagnetic particles and a process for producing them. These particles have a specific composition represented by the formula (MO)·/2(FeO), where M is a divalent metal. The molar ratio of Fe to M (n) ranges from more than 2.05 to less than 2.5. The particles contain a superparamagnetic component in an amount of not more than 2% by mass and have an average particle diameter of 5 to 30 nm. They are coated on the surface with a hydroxide of at least one metal, such as Si, Al, P, and Zn, in an amount of not more than 10% by mass. These spinel-type ferrimagnetic particles exhibit a high coercive force and are excellent in dispersibility and chemical stability. Additionally, the magnetic recording medium developed using these particles demonstrates outstanding frequency characteristics, high output, weather resistance, and reliability. Another notable patent involves Mg-Al-based hydrotalcite-type particles and a chlorine-containing resin composition for covering electric wires, which boasts heat stability and high volume resistivity.

Career Highlights

Throughout his career, Tsutomu Katamoto has worked with notable companies, including Toda Kogyo Corporation and Dainichiseika Color & Chemicals Mfg. Co., Ltd. His work in these organizations has allowed him to refine his expertise in material science and contribute to innovative solutions in the industry.

Collaborations

Katamoto has collaborated with esteemed colleagues, including Naoya Kobayashi and Torayuki Honmyo. Their combined efforts have further advanced the research and development of magnetic materials.

Conclusion

Tsutomu Katamoto's contributions to the field of magnetic materials through his patents and collaborations highlight his role as an influential inventor. His innovative work continues to impact various technologies and industries.

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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