Patents by Inventor Che-Kang Lu

Che-Kang Lu 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).

  • Phone device for public switched telecommunication network and voice over internet protocol network
    Publication number: 20070165611
    Abstract: A phone device for the Public Switched Telecommunication Network (PSTN) and Voice over Internet Protocol (VoIP) network is provided. It is used to dial up through the PSTN and the VoIP network automatically or selectively, suitable for telecommunication networks of both inbound and outbound calls. A phone device includes a control circuit for coupling the analog phone module with the VoIP module, wherein the VoIP module is used for dial up through the PSTN, and a signal detection module is used to handle the operation timing between the VoIP network and the PSTN.
    Type: Application
    Filed: January 10, 2006
    Publication date: July 19, 2007
    Inventors: Rong-Chin Yang, Chih-Hsin Chuang, Che-Kang Lu