For the Inventor, By the Inventor

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Cheongju, South Korea

Sk Keyfoundry Inc.

USPTO Granted Patents = 54

Trademarks = 1

Forward Citations = 4

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76 inventors (with patents filed for the assignee):

Keesik Ahn (7 out of 7 patents)

Yang Beom Kang (6 out of 13 patents)

Kang Sup Shin (5 out of 14 patents)

4. Kee Sik Ahn (5 out of 14 patents)

5. Jong Yeul Jeong (5 out of 11 patents)

6. Sung Bum Park (5 out of 14 patents)

7. Sungbum Park (5 out of 7 patents)

8. Min Kuck Cho (4 out of 13 patents)

9. Sang Geun Koo (4 out of 5 patents)

10. Jeong Ho Sheen (4 out of 4 patents)

11. Hee Hwan Ji (3 out of 16 patents)

12. Kwang Il Kim (3 out of 18 patents)

13. Seong Jun Park (3 out of 10 patents)

14. Jung Hwan Lee (3 out of 15 patents)

15. Wan-Chul Kong (3 out of 3 patents)

Core Competencies:

Semiconductor Device

Non-Volatile Memory

High Voltage Isolation

Deep Trench Isolation

Analog to Digital Converter

eFuse OTP Memory

Power MOSFET

Electrical Fuse

Digital Isolator Capacitor

Flash Memory

Bipolar-CMOS-DMOS

Trench Capacitor

54 patents: Sort by Forward Citations

1. 12720850 - High voltage semiconductor device having Schottky barrier diode (2026-08-25),

2. 12635152 - Manufacturing method of a semiconductor device having high-voltage isolation capacitor (2026-05-19),

3. 12615829 - Semiconductor device with field plate structures (2026-04-28),

4. 12610794 - Semiconductor device and method having deep trench isolation (2026-04-21),

5. 12532464 - Semiconductor device including single poly non-volatile memory device and method of manufacturing same (2026-01-20),

6. 12527074 - Semiconductor device with bootstrap diode (2026-01-13),

7. 12526991 - Manufacturing method of non-volatile memory device having uniform dielectric film profile (2026-01-13),

8. 12489050 - Semiconductor device having high breakdown voltage capacitor (2025-12-02),

9. 12484259 - Non-volatile semiconductor memory device and method of manufacturing the same (2025-11-25),

10. 12464736 - Semiconductor device with digital isolator capacitor and manufacturing method thereof (2025-11-04),

11. 12457777 - Semiconductor device with deep trench isolation (2025-10-28),

12. 12456532 - eFuse OTP memory device including serial interface logic and operation method thereof (2025-10-28),

13. 12445131 - Bidirectional I/O circuit and integrated circuit including bidirectional I/O circuit (2025-10-14),

14. 12432912 - Mask-programmable read only memory with electrically isolated cells (2025-09-30),

15. 12424284 - Electrical fuse one time programmable (OTP) memory (2025-09-23),

Sk Keyfoundry Inc. is a leading manufacturer of high-quality keys and key blanks. With over 20 years of experience in the industry, we specialize in providing customized solutions for our clients. Our state-of-the-art facilities and experienced team ensure that we deliver top-notch products to meet our customers' needs. We are committed to excellence and customer satisfaction in every aspect of our business.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Sep 22 2026

54 Patents

#4 in Cheongju

#306 in South Korea

#13,092 in the World

Cheongju, South Korea

Sk Keyfoundry Inc.

Forward Citations = 4

76 inventors:

Keesik Ahn (7 out of 7 patents)

Yang Beom Kang (6 out of 13 patents)

Kang Sup Shin (5 out of 14 patents)

4. Kee Sik Ahn (5 out of 14 patents)

5. Jong Yeul Jeong (5 out of 11 patents)

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