Patents by Inventor Yiu Fu

Yiu Fu 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).

  • Double lock
    Patent number: 4345447
    Abstract: A laminated padlock includes a J-shaped shackle with a U-shaped locking plate and a T-shaped locking plate, the leg of the T-shaped locking plate being slidably fitted between the spaced legs of the U-shaped locking plate.
    Type: Grant
    Filed: November 3, 1980
    Date of Patent: August 24, 1982
    Inventors: Poon C. Keung, Yiu Fu