Patents by Inventor Po-Wen Chao

Po-Wen Chao 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).

  • Tool box
    Patent number: 6109437
    Abstract: A tool box has a lower casing and an upper casing engaging with the lower casing. The lower casing has a plurality of separation plates, and at least a series of spaced grooves defined between two of the separation plates. Each of the separation plates has a plurality of click blocks and a plurality of click protrusions. A plurality of sleeves are inserted in the spaced grooves. Each of the sleeves has a center hole engaging with the respective click block and the respective click protrusion.
    Type: Grant
    Filed: November 6, 1999
    Date of Patent: August 29, 2000
    Inventor: Po-Wen Chao