Patents by Inventor John Demanczyk, Jr.

John Demanczyk, Jr. 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).

  • Crab mallet
    Patent number: D297696
    Type: Grant
    Filed: May 5, 1986
    Date of Patent: September 20, 1988
    Inventor: John Demanczyk, Jr.
  • Modified crab mallet
    Patent number: D299404
    Type: Grant
    Filed: May 5, 1986
    Date of Patent: January 17, 1989
    Inventor: John Demanczyk, Jr.