Patents by Inventor Fu L. Chen

Fu L. Chen 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).

  • Padlock
    Patent number: 5070713
    Abstract: A padlock has a case, a locking mechanism, a shackle and a key. The locking mechanism, which is housed in the case, has a shield chip, five plate tumblers, a locking plate, a plate spring and two plates sandwiching them. To prevent the padlock from being pried open by an illegal tool, a shield chip prevents one of the plate tumblers from being moved up.
    Type: Grant
    Filed: January 4, 1991
    Date of Patent: December 10, 1991
    Inventor: Fu L. Chen