Patents by Inventor Zhi Jun Liao

Zhi Jun Liao 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).

  • Key press detecting circuit
    Patent number: 8138811
    Abstract: A key press detecting circuit for detecting the status of the key is provided. The key press detecting circuit comprises a discharging circuit which discharges when the key (K1) is pressed; and a voltage detecting circuit, which comprises a combination of a PNP transistor (T2) and a NPN transistor (T3), wherein when the discharging circuit discharges for a predefined period, the PNP transistor (T2) will be turn on, which causes the NPN transistor (T3) to be turned on and to output a second signal for a second function.
    Type: Grant
    Filed: May 13, 2009
    Date of Patent: March 20, 2012
    Assignee: Thomson Licensing
    Inventors: Zhi Jun Liao, Robert Warren Schmidt, Ai Hua Sun
  • Key press detecting circuit
    Publication number: 20090284301
    Abstract: A key press detecting circuit for detecting the status of the key is provided. The key press detecting circuit comprises a discharging circuit which discharges when the key (K1) is pressed; and a voltage detecting circuit, which comprises a combination of a PNP transistor (T2) and a NPN transistor (T3), wherein when the discharging circuit discharges for a predefined period, the PNP transistor (T2) will be turn on, which causes the NPN transistor (T3) to be turned on and to output a second signal for a second function.
    Type: Application
    Filed: May 13, 2009
    Publication date: November 19, 2009
    Inventors: Zhi Jun Liao, Robert Warren Schmidt, Ai Hua Sun