Patents by Inventor Li K. Yu

Li K. Yu 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: 4641815
    Abstract: A hydraulic jack includes a pump, a high pressure chamber, a low pressure chamber and a passage with a one-way valve communicating the high pressure chamber and the low pressure chamber. When a load is encountered, the high pressure chamber and the low pressure chamber are connected immediately through the passage through which the pump feeds the low pressure chamber to lift the load.
    Type: Grant
    Filed: June 12, 1986
    Date of Patent: February 10, 1987
    Assignee: Fu-Chi Metalic Engineering Co. Ltd.
    Inventor: Li K. Yu