Patents by Inventor David Hammerquist

David Hammerquist 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).

  • Chemically lighted swizzel stick
    Patent number: D301104
    Type: Grant
    Filed: October 23, 1986
    Date of Patent: May 16, 1989
    Inventor: David Hammerquist
  • Game token
    Patent number: D307303
    Type: Grant
    Filed: January 8, 1987
    Date of Patent: April 17, 1990
    Inventor: David Hammerquist