Patents by Inventor Norman Cleaveland

Norman Cleaveland 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).

  • Circular jig
    Patent number: 4310413
    Abstract: Circular jig for gravity separation of minerals, e.g. gold and tin ore, comprising a screen, a grid forming cells over the screen, a central jig box of polygonal, e.g. square shape, pulsating means to cause the jig bed to pulsate and aprons attached to the side walls of the jig box extending outwardly from the jig box to distribute overflow from the jig box to portions of the jig bed remote from the jig box.
    Type: Grant
    Filed: June 16, 1980
    Date of Patent: January 12, 1982
    Inventor: Norman Cleaveland