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For the Inventor, By the Inventor

Seoul, South Korea

Ktfreetel Co., Ltd


USPTO Granted Patents = 78

% Expired Patents = 33.3


Forward Citations = 546

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117 inventors (with patents filed for the assignee):

goldMedal Youn-Ok Park (19 out of 60 patents)

silverMedal Chul-Sik Yoon (15 out of 43 patents)

bronzeMedal Byung-Han Ryu (11 out of 63 patents)

4.  Kun-Min Yeo (11 out of 13 patents)

5.  Jae-Heung Kim (10 out of 43 patents)

6.  Jun-Woo Kim (9 out of 30 patents)

7.  Soon-Yong Lim (9 out of 12 patents)

8.  Nam-Hoon Park (6 out of 19 patents)

9.  Dong-Seung Kwon (5 out of 33 patents)

10.  Yeong-Jin Kim (5 out of 11 patents)

11.  Chang-Wahn Yu (5 out of 12 patents)

12.  Seung-Ku Hwang (5 out of 15 patents)

13.  Young-Ha Lee (4 out of 10 patents)

14.  Jee-Hwan Ahn (4 out of 21 patents)

15.  Su-Chang Chae (4 out of 8 patents)


Core Competencies:
Wireless Portable Internet
OFDMA System
Traffic Encryption
Channel Quality
Mobile Communication
Ranging Method
Multi-Mode Terminal
Signal Processing
Network Synchronization
Uplink Channel
Dynamic Address Allocation
Mobile Messaging

78 patents:

1. 8934448 - Handover method in wireless portable internet system (2015-01-13),
2. 8792415 - Apparatus and method for scheduling of high-speed portable internet system (2014-07-29),
3. 8615218 - Method for requesting, generating and distributing service-specific traffic encryption key in wireless portable internet system, apparatus for the same, and protocol configuration method for the same (2013-12-24),
4. 8588189 - Wireless internet terminal and packet transmission method for improving quality of service (2013-11-19),
5. 8588145 - Method for allocating and accessing radio resources in OFDMA system (2013-11-19),
6. 8462706 - Method for requesting and reporting channel quality information in wireless system and apparatus thereof (2013-06-11),
7. 8406320 - Digital clipping method for a transmitter of an orthogonal frequency division multiple access system (2013-03-26),
8. 8374145 - Method for requesting and reporting channel quality information in wireless portable internet system (2013-02-12),
9. 8194619 - Terminal in wireless communication system and ranging method thereof (2012-06-05),
10. 8185108 - Multi-mode communication system and method thereof (2012-05-22),
11. 8170147 - Apparatus for cancelling DC offset and method thereof (2012-05-01),
12. 8155104 - Method for preamble-based bandwidth request in wireless portable internet system (2012-04-10),
13. 8145257 - Apparatus and method for providing mobile instant messaging service (2012-03-27),
14. 8140054 - Method for authenticating subscriber station, method for configuring protocol thereof, and apparatus thereof in wireless portable internet system (2012-03-20),
15. 8134914 - Subcarrier allocation apparatus and method, subcarrier de-allocation apparatus and method in OFDM system (2012-03-13),
Company Overview
Ktfreetel Co., Ltd, based in Seoul, South Korea, specializes in wireless communication technologies, focusing on the development of innovative solutions for mobile connectivity. The company is engaged in research and development of wireless portable internet systems, employing advanced techniques such as OFDMA for efficient data transmission. Their expertise extends to traffic encryption, channel quality optimization, and signal processing, positioning them as a key player in enhancing mobile communication and multi-mode terminal functionalities.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

78 Patents

#94 in Seoul

#228 in South Korea

#9,681 in the World

Seoul, KR
Seoul, South Korea

Ktfreetel Co., Ltd

Forward Citations = 546

117 inventors:

goldMedal Youn-Ok Park (19 out of 60 patents)

silverMedal Chul-Sik Yoon (15 out of 43 patents)

bronzeMedal Byung-Han Ryu (11 out of 63 patents)

4.  Kun-Min Yeo (11 out of 13 patents)

5.  Jae-Heung Kim (10 out of 43 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Ktfreetel Co., Ltd. Retrieved from https://idiyas.com/company/ktfreetel-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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