Patents by Inventor Du-Jin Cha

Du-Jin Cha has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Apparatus and method for providing subscriber identity module (SIM) application toolkit service in mobile communication system
    Patent number: 9326131
    Abstract: An apparatus and method for providing a Subscriber Identity Module (SIM) Application Toolkit (SAT) service in a mobile communication system is provided. The mobile communication system includes a toolkit management server and a mobile communication terminal. The mobile communication terminal includes a SIM card having a connection command for the toolkit management server.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: April 26, 2016
    Assignee: Samsung Electronics Co., Ltd
    Inventor: Du-Jin Cha
  • Method and apparatus for speed dialing by mobile country code/mobile network code in mobile communication system
    Patent number: 8914069
    Abstract: A method and apparatus for speed dialing in a mobile communication system are provided. In the method, a speed dial code is input and transmitted to a SIM card. A dialing number corresponding to the speed dial code is detected from the SIM card. The detected dialing number is transmitted to a User Equipment (UE) through a mechanism of Call Control by SIM.
    Type: Grant
    Filed: November 5, 2008
    Date of Patent: December 16, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Du-Jin Cha
  • Apparatus and method for providing SIM application toolkit in mobile communication system
    Patent number: 8494584
    Abstract: The present invention relates to an apparatus and method for installing a downloaded applet of an SAT list in portable terminal. The apparatus includes a controller for conducting an applet installation process. The applet is downloaded and requested based on user's selection of an item from the SAT list which represents a list of available SAT services in the portable terminal.
    Type: Grant
    Filed: December 24, 2008
    Date of Patent: July 23, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Du-Jin Cha
  • Apparatus and method of determining maximum segment size of data call in mobile communication system
    Patent number: 8295197
    Abstract: An apparatus and method for determining a maximum segment size (MSS) in a mobile communication system. When the portable terminal accesses a multimedia service server through a data call, the method includes confirming whether or not a maximum segment size (MSS) of the server is stored; if the MSS is stored, the server is accessed using the MSS; and if the MSS is not stored, determining the MSS of the server through a ping procedure.
    Type: Grant
    Filed: March 18, 2010
    Date of Patent: October 23, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Dae-Eui Yoon, Du-Jin Cha
  • APPARATUS AND METHOD OF DETERMINING MAXIMUM SEGMENT SIZE OF DATA CALL IN MOBILE COMMUNICATION SYSTEM
    Publication number: 20100290357
    Abstract: An apparatus and method for determining a maximum segment size (MSS) in a mobile communication system. When the portable terminal accesses a multimedia service server through a data call, the method includes confirming whether or not a maximum segment size (MSS) of the server is stored; if the MSS is stored, the server is accessed using the MSS; and if the MSS is not stored, determining the MSS of the server through a ping procedure.
    Type: Application
    Filed: March 18, 2010
    Publication date: November 18, 2010
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Dae-Eui YOON, Du-Jin CHA
  • APPARATUS AND METHOD FOR PROVIDING SIM APPLICATION TOOLKIT IN MOBILE COMMUNICATION SYSTEM
    Publication number: 20090170481
    Abstract: The present invention relates to an apparatus and method for installing a downloaded applet of an SAT list in portable terminal. The apparatus includes a controller for conducting an applet installation process. The applet is downloaded and requested based on user's selection of an item from the SAT list which represents a list of available SAT services in the portable terminal.
    Type: Application
    Filed: December 24, 2008
    Publication date: July 2, 2009
    Applicant: Samsung Electronics Co., Ltd.
    Inventor: Du-Jin Cha
  • METHOD AND APPARATUS FOR SPEED DIALING BY MOBILE COUNTRY CODE/MOBILE NETWORK CODE IN MOBILE COMMUNICATION SYSTEM
    Publication number: 20090124291
    Abstract: A method and apparatus for speed dialing in a mobile communication system are provided. In the method, a speed dial code is input and transmitted to a SIM card. A dialing number corresponding to the speed dial code is detected from the SIM card. The detected dialing number is transmitted to a User Equipment (UE) through a mechanism of Call Control by SIM.
    Type: Application
    Filed: November 5, 2008
    Publication date: May 14, 2009
    Applicant: Samsung Electronics Co. Ltd.
    Inventor: Du-Jin CHA
  • APPARATUS AND METHOD FOR PROVIDING SUBSCRIBER IDENTITY MODULE (SIM) APPLICATION TOOLKIT SERVICE IN MOBILE COMMUNICATION SYSTEM
    Publication number: 20090011745
    Abstract: An apparatus and method for providing a Subscriber Identity Module (SIM) Application Toolkit (SAT) service in a mobile communication system is provided. The mobile communication system includes a toolkit management server and a mobile communication terminal. The mobile communication terminal includes a SIM card having a connection command for the toolkit management server.
    Type: Application
    Filed: July 7, 2008
    Publication date: January 8, 2009
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Du-Jin CHA