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Busan, South Korea

Em-Tech Co., Ltd.

USPTO Granted Patents = 58

% Expired Patents = 34.5

EPO Patents = 14

Trademarks = 1

Forward Citations = 150

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69 inventors (with patents filed for the assignee):

Cheon Myeong Kim (13 out of 13 patents)

Yong Ju Ji (12 out of 12 patents)

Joong Hak Kwon (10 out of 14 patents)

4. Ji Hoon Kim (9 out of 9 patents)

5. Kyu Dong Choi (8 out of 8 patents)

6. Jun Hee Han (7 out of 7 patents)

7. Ji Young Lee (6 out of 13 patents)

8. Jae Hwa Lim (5 out of 5 patents)

9. Jeong Ae Ha (5 out of 5 patents)

10. Seul Ki Nam (5 out of 5 patents)

11. Byung Min Yu (5 out of 6 patents)

12. Young Seok Noh (4 out of 5 patents)

13. Sung Hoo Jung (4 out of 13 patents)

14. Jung Ho Kang (4 out of 4 patents)

15. Byung Ho Jung (4 out of 4 patents)

Core Competencies:

Microspeaker

Sound Transducer

EEG Measuring Device

Hybrid Actuator

Bone Conduction Speaker

Acoustic Transducer

Vibration Module

Pressure Equilibrium Structure

Waterproof Microspeaker

Dynamic Receiver

Sound Converter

Hearing Assistant Device

58 patents: Sort by Forward Citations

1. 12470862 - Hybrid microspeaker (2025-11-11),

2. 12413896 - Two-way speaker (2025-09-09),

3. 12408237 - Circuit for sensing and controlling heater voltage in aerosol generator (2025-09-02),

4. 12268521 - EEG measuring device (2025-04-08),

5. 12267659 - Waterproof microspeaker (2025-04-01),

6. 12252468 - Method for purifying waste N-methyl-2-pyrrolidone mixture solution (2025-03-18),

7. 12207046 - Microspeaker enclosure including block formed of porous particles (2025-01-21),

8. 12143793 - Diaphragm for high pressure waterproof microspeaker and high pressure waterproof microspeaker including the same (2024-11-12),

9. 12137311 - Earphone with duct unit dividing pressure equilibrium hole and back hole (2024-11-05),

10. 11962965 - Wireless earbud having external ear contact point (2024-04-16),

11. 11696508 - Sound vibration sensor using piezoelectric element having cantilever structure (2023-07-04),

12. 11696059 - Two-way receiver having front bass duct (2023-07-04),

13. 11564026 - Earphone having pressure equilibrium structure (2023-01-24),

14. 11528563 - Hybrid receiver having fixing bracket for drivers (2022-12-13),

15. 11463815 - Yoke assembly for two-way receiver and two-way receiver having the same (2022-10-04),

Company Overview

Em-Tech Co., Ltd., based in Busan, South Korea, specializes in advanced audio technology solutions. The company focuses on the development and manufacturing of innovative sound transducers, microspeakers, and bone conduction speakers, catering to diverse audio applications. Em-Tech is also engaged in the design of EEG measuring devices and hybrid actuators, enhancing the intersection of audio and biomedical technologies. Their expertise extends to vibration modules and pressure equilibrium structures, positioning them as a key player in the audio technology sector.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

58 Patents

#5 in Busan

#288 in South Korea

#12,407 in the World

Busan, South Korea

Em-Tech Co., Ltd.

Forward Citations = 150

69 inventors:

Cheon Myeong Kim (13 out of 13 patents)

Yong Ju Ji (12 out of 12 patents)

Joong Hak Kwon (10 out of 14 patents)

4. Ji Hoon Kim (9 out of 9 patents)

5. Kyu Dong Choi (8 out of 8 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Em-Tech Co., Ltd.. Retrieved from https://idiyas.com/company/em-tech-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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