Patents by Inventor Jack Grindrod

Jack Grindrod 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).

  • Shot shell wadding
    Patent number: 4004522
    Abstract: A shot/shell wadding for a shotgun cartridge wherein a progressively collapsible connection is provided between a charge-containing cup and a shot-containing cup, the said connection including co-operable elements which move into frictional engagement on initial collapse of the connection and exert an increasing resistance to relative motion between the charge-containing and shot-containing cups on continued collapse of the connection.
    Type: Grant
    Filed: September 26, 1974
    Date of Patent: January 25, 1977
    Assignee: Unit Wad Limited
    Inventors: Harry Furniss, Jack Grindrod