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For the Inventor, By the Inventor

Gyeongsangnam-do, South Korea

Em-tech Co., Ltd.


USPTO Granted Patents = 58


Trademarks = 1

Forward Citations = 136

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69 inventors (with patents filed for the assignee):

goldMedal Cheon Myeong Kim (13 out of 13 patents)

silverMedal Yong Ju Ji (12 out of 12 patents)

bronzeMedal 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 4 patents)

13.  Sung Hoo Jung (4 out of 12 patents)

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

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


Core Competencies:
Hybrid Microspeaker
Two-Way Speaker
EEG Measuring Device
Waterproof Microspeaker
Sound Vibration Sensor
Bone Conduction Speaker
Wireless Earbud
Pressure Equilibrium Structure
Sound Converting Device
Dynamic Receiver
Hearing Assistant Device
Acoustic Transducer

58 patents:

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),
EM-TECH CO., LTD. is a technology company specialized in providing innovative solutions for various industries. With a focus on cutting-edge technologies, we develop and deliver state-of-the-art products tailored to meet the specific needs of our clients. Our dedicated team of experts consistently strives to exceed expectations and ensure utmost customer satisfaction. Visit our website to learn more about our offerings and how we can assist your business in achieving its goals.
This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Dec 30 2025

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58 Patents

#1 in Gyeongsangnam-do

#284 in South Korea

#12,003 in the World

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Gyeongsangnam-do, South Korea

Em-tech Co., Ltd.

Forward Citations = 136

69 inventors:

goldMedal Cheon Myeong Kim (13 out of 13 patents)

silverMedal Yong Ju Ji (12 out of 12 patents)

bronzeMedal 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)

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