Patents by Inventor Heng Zhi Zeng

Heng Zhi Zeng 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).

  • Water sprayer gun
    Patent number: D501537
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: February 1, 2005
    Inventor: Heng Zhi Zeng
  • Water sprayer gun
    Patent number: D501538
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: February 1, 2005
    Inventor: Heng Zhi Zeng