Patents by Inventor Chunmig Yang

Chunmig Yang 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).

  • Incremental step drilling system and method
    Patent number: 6857828
    Abstract: A method for drilling a hole in a work piece, such as printed circuit boards, comprises drilling to a point in a work piece and retracting said drill bit a retract distance. The retract distance is configured such that a tip end of said drill bit remains below a top surface of said work piece. The method further comprises drilling a distance greater than said retract distance into said work piece.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: February 22, 2005
    Assignee: Excellon Automation Company
    Inventors: Kurt W. Weber, Warren K. Wong, Chunmig Yang