Patents by Inventor Sun Joong Ryu

Sun Joong Ryu 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).

  • Drill bit for PCB
    Publication number: 20070286693
    Abstract: Disclosed is a drill bit for making a hole through stacked PCBs includes a drill part formed with drilling edges on an outer surface thereof and brought into contact with the PCBs, that is, a workpiece in which to make the hole; a reamer part formed on the rear end of the drill part and having at least one reaming edge for finishing the surface of the hole; and a shank part formed on the rear end of the reamer part and mounted to a machine tool.
    Type: Application
    Filed: March 27, 2007
    Publication date: December 13, 2007
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Seung Hyun Cho, Han Kim, Sun Joong Ryu, Il Soung Yoon