Patents by Inventor Liu H. Li

Liu H. Li 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).

  • Vacuum cleaner
    Patent number: D568562
    Type: Grant
    Filed: May 11, 2007
    Date of Patent: May 6, 2008
    Assignee: Shop-Vac Corporation
    Inventors: John Griffin, Robert L. Crevling, Jr., Liu H. Li
  • Vacuum cleaner
    Patent number: D568564
    Type: Grant
    Filed: May 11, 2007
    Date of Patent: May 6, 2008
    Assignee: Shop-Vac Corporation
    Inventors: John Griffin, Robert L. Crevling, Jr., Liu H. Li
  • Vacuum cleaner
    Patent number: D602661
    Type: Grant
    Filed: May 11, 2007
    Date of Patent: October 20, 2009
    Assignee: Shop-Vac Corporation
    Inventors: John Griffin, Robert L. Crevling, Jr., Liu H. Li