Patents by Inventor Joseph Ping Kong Choy

Joseph Ping Kong Choy 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 ball release
    Publication number: 20020158108
    Abstract: There is disclosed a method and apparatus for ensuring release of objects such as solder balls from a pick head in a transfer and placement apparatus, comprising causing said pick head to vibrate by applying a vibration signal to said pick head over a range of frequencies. The range of frequencies is chosen such that it bounds the resonant frequencies of the pick head which may be calculated by computer simulation.
    Type: Application
    Filed: April 30, 2001
    Publication date: October 31, 2002
    Inventors: Chi Wah Cheng, Joseph Ping Kong Choy, Benson Ping Chun Chong, Ka Kin Wong, Chi Fung Chan