Patents by Inventor John Keh-Jong Liu

John Keh-Jong Liu 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).

  • Sludge supernatant decanting device
    Patent number: 5800700
    Abstract: A sludge supernatant decanting device for automatically decanting the supernatant from a sludge holding tank. The sludge supernatant decanting device includes a decant column connected to and in fluid communication with a supernatant discharge conduit and disposed within a sludge holding tank having a plurality of spaced-apart apertures. The spaced-apart apertures are opened and sealingly closed by a plurality of float switches hingedly attached to the decant column by sealed ball bearing hinges.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: September 1, 1998
    Inventor: John Keh-Jong Liu