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Hwaseong-si, South Korea

Yonsung Fine Chemical Co., Ltd.

USPTO Granted Patents = 13

EPO Patents = 7

Forward Citations = 34

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25 inventors (with patents filed for the assignee):

Kee Young Lee (5 out of 8 patents)

Hyunik Shin (5 out of 6 patents)

Changyoung Oh (5 out of 5 patents)

4. Hyun Ik Shin (3 out of 4 patents)

5. Hyoseon Lee (3 out of 3 patents)

6. Yong-Hyun Kim (3 out of 5 patents)

7. Yiu-Suk Lee (3 out of 3 patents)

8. Chang Young Oh (2 out of 5 patents)

9. Keeyoung Lee (2 out of 2 patents)

10. Kee-Young Lee (2 out of 3 patents)

11. Won-Hun Ham (2 out of 2 patents)

12. Chang-Young Oh (2 out of 2 patents)

13. Yong Hyun Kim (2 out of 40 patents)

14. Areum Baek (1 out of 3 patents)

15. Eun Jeong Ko (1 out of 1 patent)

13 patents: Sort by Forward Citations

1. 12486283 - Crystalline salt of eribulin (2025-12-02),

2. 12351551 - Method for producing maxacalcitol, and intermediate therefor (2025-07-08),

3. 12325712 - Method for preparing naldemedine (2025-06-10),

4. 11142509 - Intermediate for preparing eribulin mesylate and process for preparing the same (2021-10-12),

5. 10870621 - Method for preparing latanoprostene bunod, and intermediate therefor (2020-12-22),

6. 10865212 - Intermediate for preparing eribulin mesylate and process for preparing the same (2020-12-15),

7. 10800737 - Method for preparing treprostinil and intermediate therefor (2020-10-13),

8. 10538539 - Method for preparing 3-((2S, 5S)-4-methylene-5-(3-oxopropyl)tetrahydrofurane-2-yl) propanol derivative, and intermediate therefor (2020-01-21),

9. 9126898 - Process for preparing prostaglandin derivatives (2015-09-08),

10. 7345181 - Process for preparing prostaglandin derivatives and starting materials for the same (2008-03-18),

11. 6989458 - Process for preparing prostaglandin derivatives and stereospecific starting material thereof (2006-01-24),

12. 6914159 - Process for preparing sulfamoyl-substituted phenethylamine derivatives (2005-07-05),

13. 6852880 - Process for preparing prostalglandin derivatives and stereospecific starting material thereof (2005-02-08),

Yonsung Fine Chemical Co., Ltd. is a leading manufacturer of specialty chemicals for various industries including pharmaceuticals, cosmetics, and electronics. With a focus on innovation and quality, Yonsung is committed to providing customers with high-performance products that meet their unique needs. Established in 1987, the company has a strong track record of delivering world-class solutions and building long-lasting partnerships with clients around the globe.

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Company Badge

USPTO Data Jan 1 1976 - Jan 6 2026

13 Patents

#10 in Hwaseong-si

#836 in South Korea

#43,712 in the World

Hwaseong-si, South Korea

Yonsung Fine Chemical Co., Ltd.

Forward Citations = 34

25 inventors:

Kee Young Lee (5 out of 8 patents)

Hyunik Shin (5 out of 6 patents)

Changyoung Oh (5 out of 5 patents)

4. Hyun Ik Shin (3 out of 4 patents)

5. Hyoseon Lee (3 out of 3 patents)

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