Patents by Inventor Chung K. Lee

Chung K. Lee 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).

  • Method of processing intelligent network service call with DTMF subscriber signalling in electronic switching system for toll/tandem
    Patent number: 5448617
    Abstract: A method of processing an intelligent network service call in a service switching point (SSP) which has a DTMF processor and is connected to the originating local exchange/transit exchange to provide an intelligent network service. The SSP receives a digit from the other exchange in a R2MFC signalling mode to process a trunk signal from the other exchange upon generation of a trunk line seizure request from the other exchange. The SSP analyzes the received digit to check whether a call from the other exchange is a normal call or an intelligent network service call in which subscriber's information must be received in the middle of the service. If the call from the other exchange is the intelligent network service call, the SSP collects a calling number and a calling category from the other exchange, releases the R2MFC signalling mode and forms a speech path with the other exchange to communicate directly with a service user.
    Type: Grant
    Filed: December 13, 1993
    Date of Patent: September 5, 1995
    Assignees: Electronics and Telecommunications Research Institute, Korea Telecommunication Authority
    Inventors: Seon M. Hong, Tae I. Kim, Hyeong H. Lee, Chung K. Lee, Go B. Choi, Young S. Kim, Yong B. Kim, Cheon S. Kim