Patents by Inventor T. P. Chern

T. P. Chern 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).

  • Patent number: 5160225
    Abstract: A threaded insert for drywall with a structure comprises a cylindrical body which includes an axial entrance hole at one end, an axial cavity at the other end, a high auger disposed thereon, a low thread disposed between the auger, a pair of drilling bits, diametrically opposed to each other, attaching to the bottom periphery of the axial cavity and extending therefrom to terminate a separately attached drilling tip. Extending from the entrance hole through the cavity, the body includes an internal passage for the insertion of a threaded fastener and facilitating the expelling of dusts. The drilling tip are separable upon the advancement of the fastener driven through the internal passage. The low thread strengthens pull-out resistance while the insert installed in the wall.
    Type: Grant
    Filed: August 23, 1991
    Date of Patent: November 3, 1992
    Inventor: T. P. Chern