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Powdertech Co., Ltd.

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USPTO Granted Patents = 94

% Expired Patents = 13.8

EPO Patents = 46

Trademarks = 3

Forward Citations = 161

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61 inventors (with patents filed for the assignee):

Koji Aga (32 out of 34 patents)

Takao Sugiura (21 out of 22 patents)

Hiromichi Kobayashi (21 out of 23 patents)

4. Yuji Sato (21 out of 23 patents)

5. Tetsuya Uemura (20 out of 22 patents)

6. Toshio Honjo (17 out of 17 patents)

7. Kanao Kayamoto (15 out of 15 patents)

8. Hiroki Sawamoto (13 out of 13 patents)

9. Takashi Kojima (12 out of 101 patents)

10. Makoto Ishikawa (11 out of 12 patents)

11. Tetsuya Igarashi (11 out of 14 patents)

12. Tsuyoshi Itagoshi (10 out of 11 patents)

13. Issei Shinmura (10 out of 10 patents)

14. Kazutaka Ishii (8 out of 8 patents)

15. Tomoyuki Suwa (7 out of 7 patents)

Core Competencies:

Electrophotographic Developer

Ferrite Particles

Resin Composition

Carrier Core Material

Magnetic Core Material

Mn Ferrite Powder

Iron Oxide Powder

Spherical Ferrite

Oxygen Detector

Electromagnetic Shielding

Carrier Production Method

Granulating Method

94 patents: Sort by Forward Citations

1. 12455516 - Ferrite particle, carrier core material for electrophotographic developer, carrier for electrophotographic developer, and electrophotographic developer (2025-10-28),

2. 12436480 - Ferrite particles, electrophotographic developer carrier core material, electrophotographic developer carrier, and electrophotographic developer (2025-10-07),

3. 12422763 - Ferrite particles, electrophotographic developer carrier core material, electrophotographic developer carrier, and electrophotographic developer (2025-09-23),

4. 12386281 - Ferrite particles, electrophotographic developer carrier core material, electrophotographic developer carrier, and electrophotographic developer (2025-08-12),

5. 12253825 - Ferrite particles, electrophotographic developer carrier core material, electrophotographic developer carrier, and electrophotographic developer (2025-03-18),

6. 12204280 - Carrier, xerographic developer, and carrier production method (2025-01-21),

7. 12134567 - Ferrite powder and method for producing same (2024-11-05),

8. 12119151 - Ferrite powder and method of producing the same (2024-10-15),

9. 11952286 - Mn ferrite powder, resin composition, electromagnetic wave shielding material, electronic material, and electronic component (2024-04-09),

10. 11651881 - Mn—Zn ferrite particles, resin molded body, soft magnetic mixed powder, and magnetic core (2023-05-16),

11. 11572926 - Iron oxide powder for brake friction material (2023-02-07),

12. 11542174 - Ferrite particles, resin compositions and electromagnetic wave shielding material (2023-01-03),

13. 11521768 - Ferrite powder, resin composition, and molded body (2022-12-06),

14. 11422480 - Ferrite carrier core material for electrophotographic developer, ferrite carrier, manufacturing method thereof, and electrophotographic developer using said ferrite (2022-08-23),

15. 11359689 - Iron oxide powder for brake friction material (2022-06-14),

Company Overview

Powdertech Co., Ltd., based in Chiba, Japan, specializes in the development and manufacturing of electrophotographic developers. The company focuses on advanced materials, particularly in the realm of ferrite particles and resin compositions. Its expertise extends to carrier core materials and magnetic core materials, including manganese ferrite powder and iron oxide powder. Powdertech is dedicated to innovation in the field of electrophotography, providing high-quality solutions for various applications in the printing and imaging industries.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 27 2026

94 Patents

#15 in Chiba

#1,168 in Japan

#8,211 in the World

Powdertech Co., Ltd.

Forward Citations = 161

61 inventors:

Koji Aga (32 out of 34 patents)

Takao Sugiura (21 out of 22 patents)

Hiromichi Kobayashi (21 out of 23 patents)

4. Yuji Sato (21 out of 23 patents)

5. Tetsuya Uemura (20 out of 22 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Powdertech Co., Ltd.. Retrieved from https://idiyas.com/company/powdertech-company

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

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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