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Gumi, South Korea

Epivalley Co. Ltd.

USPTO Granted Patents = 22

% Expired Patents = 63.6

EPO Patents = 6

Forward Citations = 234

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22 inventors (with patents filed for the assignee):

Tae-Kyung Yoo (8 out of 8 patents)

Eun Hyun Park (7 out of 8 patents)

Chang Tae Kim (5 out of 5 patents)

4. Meoung-Whan Cho (3 out of 4 patents)

5. Takafumi Yao (3 out of 7 patents)

6. Chang-Tae Kim (3 out of 4 patents)

7. Tae Kyung Yoo (2 out of 3 patents)

8. Soo Kun Jeon (2 out of 2 patents)

9. Hyun Suk Kim (2 out of 2 patents)

10. Min Gyu Na (1 out of 1 patent)

11. Hyun Su An (1 out of 1 patent)

12. Gi Yeon Nam (1 out of 1 patent)

13. Byeong Kyun Choi (1 out of 1 patent)

14. Keuk Kim (1 out of 1 patent)

15. Pil-Guk Jang (1 out of 1 patent)

22 patents: Sort by Forward Citations

1. 8124504 - Method for growth of GaN single crystal, method for preparation of GaN substrate, process for producing GaN-based element, and GaN-based element (2012-02-28),

2. 8120047 - III-nitride semiconductor light emitting device (2012-02-21),

3. 8119499 - Semiconductor substrate fabrication by etching of a peeling layer (2012-02-21),

4. 8101965 - III-nitride semiconductor light emitting device having a multilayered pad (2012-01-24),

5. 8053793 - III-nitride semiconductor light emitting device (2011-11-08),

6. 7999270 - III-nitride compound semiconductor light emitting device comprising layer with pinhole structure (2011-08-16),

7. 7915636 - III-nitride semiconductor light emitting device (2011-03-29),

8. 7863178 - Method for manufacturing a GaN based optical device (2011-01-04),

9. 7829435 - Method for growth of GaN single crystal, method for preparation of GaN substrate, process for producing GaN-based element, and GaN-based element (2010-11-09),

10. 7795610 - Semiconductor light emitting device (2010-09-14),

11. 7622742 - III-nitride compound semiconductor light emitting device (2009-11-24),

12. 7601553 - Method of manufacturing a gallium nitride semiconductor light emitting device (2009-10-13),

13. 7547909 - III-nitride compound semiconductor light emitting device (2009-06-16),

14. 7501664 - III-Nitride compound semiconductor light emitting device (2009-03-10),

15. 7498244 - Method for fabricating GaN-based nitride layer (2009-03-03),

Company Overview

Epivalley Co. Ltd. is a technology-driven company based in Gumi, South Korea, specializing in the development and manufacturing of advanced semiconductor materials and components. The organization focuses on innovative solutions that enhance the performance and efficiency of electronic devices. With a commitment to research and development, Epivalley is dedicated to advancing technology in the semiconductor industry, contributing to various applications across consumer electronics, automotive, and industrial sectors.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

22 Patents

#3 in Gumi

#598 in South Korea

#28,807 in the World

Gumi, South Korea

Epivalley Co. Ltd.

Forward Citations = 234

22 inventors:

Tae-Kyung Yoo (8 out of 8 patents)

Eun Hyun Park (7 out of 8 patents)

Chang Tae Kim (5 out of 5 patents)

4. Meoung-Whan Cho (3 out of 4 patents)

5. Takafumi Yao (3 out of 7 patents)

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