Patents by Inventor D. Leonard Stairs

D. Leonard Stairs 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).

  • Self clearing conveyor
    Patent number: 5909799
    Abstract: The apparatus is a self clearing conveyor for materials which clump together. A rotating multi-faced drum is located above the moving surface of a conveyor and rotates in a direction opposite from the movement of the conveyor. Material which is higher than the adjustable clearance between the drum and the conveyor is thrown upstream on the conveyor to try again, even if the material is initially stuck to or entangled with material passing below the drum.
    Type: Grant
    Filed: March 10, 1998
    Date of Patent: June 8, 1999
    Assignee: Aggregates Equipment, Inc.
    Inventors: D. Leonard Stairs, Lam T. Nguyen