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Seoul, South Korea

Ed-Tech Co., Ltd.

USPTO Granted Patents = 11

% Expired Patents = 36.4

Trademarks = 1

Forward Citations = 259

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11 inventors (with patents filed for the assignee):

Edward M Schwartz (6 out of 6 patents)

Wilburn D Everman (5 out of 7 patents)

Chul-Ho Lim (4 out of 4 patents)

4. Dong-Il Han (2 out of 4 patents)

5. Han Sung Jung (1 out of 40 patents)

6. Je-Hoon Oh (1 out of 1 patent)

7. Suk-Kyu Kang (1 out of 1 patent)

8. Soo-Yen Lim (1 out of 1 patent)

9. Ji Hyun Lee (1 out of 64 patents)

10. Wilburn D Evrman (1 out of 1 patent)

11. Robert E Morgan (1 out of 1 patent)

11 patents: Sort by Forward Citations

1. 7428283 - Data recovery algorithm using data position detection and serial data receiver adopting the same (2008-09-23),

2. 7388998 - Apparatus and method for controlling brightness of moving image signals in real time (2008-06-17),

3. 7336315 - Apparatus and method for performing intra-field interpolation for de-interlacer (2008-02-26),

4. 6937258 - Flat panel display device (2005-08-30),

5. 6781581 - Apparatus for interfacing timing information in digital display device (2004-08-24),

6. 5083514 - Automatic vertically adjustable work surface (1992-01-28),

7. 5048784 - Adjustable inset bracket (1991-09-17),

8. 4987835 - Automatic vertically adjustable work surface (1991-01-29),

9. 4976407 - Adjustable wrist support (1990-12-11),

10. 4969403 - Automatic vertically adjustable work surface (1990-11-13),

11. 4881471 - Vertically adjustable, retrofittable workstation (1989-11-21),

Ed-tech Co., Ltd. is a leading provider of online educational services, offering a wide range of courses and resources to help students of all ages and levels achieve their academic goals. With a team of experienced educators and cutting-edge technology, we strive to make learning accessible, engaging, and effective for all learners.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

11 Patents

#371 in Seoul

#1,008 in South Korea

#51,671 in the World

Seoul, South Korea

Ed-Tech Co., Ltd.

Forward Citations = 259

11 inventors:

Edward M Schwartz (6 out of 6 patents)

Wilburn D Everman (5 out of 7 patents)

Chul-Ho Lim (4 out of 4 patents)

4. Dong-Il Han (2 out of 4 patents)

5. Han Sung Jung (1 out of 40 patents)

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