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Dowa Electronics Materials Co., Ltd.

USPTO Granted Patents = 315

% Expired Patents = 29.2

EPO Patents = 125

Trademarks = 2

Forward Citations = 556

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245 inventors (with patents filed for the assignee):

Kenji Sakane (28 out of 37 patents)

Akira Nagatomi (27 out of 38 patents)

Tetsuya Ikuta (25 out of 25 patents)

4. Masahiro Gotoh (23 out of 28 patents)

5. Toshihiko Ueyama (23 out of 26 patents)

6. Yoshitaka Kadowaki (22 out of 22 patents)

7. Kimitaka Sato (22 out of 28 patents)

8. Ryuichi Toba (17 out of 22 patents)

9. Yasuhiro Watanabe (16 out of 110 patents)

10. Shin-ichi Ohkoshi (15 out of 28 patents)

11. Shuji Yamashita (15 out of 23 patents)

12. Kenichi Inoue (14 out of 47 patents)

13. Keiichi Endoh (14 out of 14 patents)

14. Takeshi Kawauchi (14 out of 14 patents)

15. Tomohiko Shibata (14 out of 67 patents)

Core Competencies:

Semiconductor

Light-Emitting Element

Silver Powder

Ultraviolet Device

Conductive Paste

Magnetic Powder

III-Nitride

Optical Device

Electrophotographic

Deep Ultraviolet

Spherical Silver

Iron Oxide

315 patents: Sort by Forward Citations

1. 12507504 - Group III nitride semiconductor light-emitting element and method of manufacturing same (2025-12-23),

2. 12467160 - GaAs wafer and method of producing GaAs ingot (2025-11-11),

3. 12433066 - Semiconductor optical device and method of producing the same (2025-09-30),

4. 12427570 - Silver flake powder and production method thereof, and electrically conductive paste (2025-09-30),

5. 12426409 - Point source type light-emitting diode and manufacturing method thereof (2025-09-23),

6. 12402448 - Method of producing reflective electrode for deep ultraviolet light-emitting element, method of producing deep ultraviolet light-emitting element, and deep ultraviolet light-emitting element (2025-08-26),

7. 12390854 - Silver powder, method of producing silver powder, and conductive paste (2025-08-19),

8. 12349473 - Ultraviolet light receiving device (2025-07-01),

9. 12336335 - Light-emitting element and method of producing the same (2025-06-17),

10. 12300410 - Hexagonal ferrite magnetic powder and method for producing same (2025-05-13),

11. 12296382 - Method for producing silver powder (2025-05-13),

12. 12268038 - Group III nitride semiconductor light emitting element and method of manufacturing the same (2025-04-01),

13. 12198829 - Silver powder and method for producing same (2025-01-14),

14. 12194541 - Method for producing silver powder (2025-01-14),

15. 12125702 - Semiconductor light-emitting element and method of producing the same (2024-10-22),

Company Overview

Dowa Electronics Materials Co., Ltd., based in Tokyo, specializes in advanced semiconductor technologies and materials. The company focuses on the development and manufacturing of a range of products, including light-emitting elements, conductive pastes, and magnetic powders. With expertise in III-nitride and ultraviolet devices, Dowa plays a significant role in enhancing the performance and efficiency of optical devices. Its commitment to innovation positions it as a key player in the semiconductor industry.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

315 Patents

#273 in Tokyo

#526 in Japan

#2,847 in the World

Dowa Electronics Materials Co., Ltd.

Forward Citations = 556

245 inventors:

Kenji Sakane (28 out of 37 patents)

Akira Nagatomi (27 out of 38 patents)

Tetsuya Ikuta (25 out of 25 patents)

4. Masahiro Gotoh (23 out of 28 patents)

5. Toshihiko Ueyama (23 out of 26 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Dowa Electronics Materials Co., Ltd.. Retrieved from https://idiyas.com/company/dowa-electronics-materials-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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