Patents by Inventor John Lawrence Defty-Wallace

John Lawrence Defty-Wallace 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).

  • Transport system for an automatic article grading apparatus
    Patent number: 6267249
    Abstract: A roller element for a roller assembly used in an endless conveyor system for grading/sorting articles. The roller element has a faceted peripheral edge, each facet being of equal length, with approximately 12 facets per unit. Also, a quick-release roller assembly for use in a similar endless conveyor system includes a steel shaft on which roller elements are mounted. The shaft has a first opening in one end to receive a connecting pin element from a first chain and a second opening in the other end thereof which receives a connecting pin element from a second chain. Bushings are positioned in both of the shaft openings for receiving the connecting pin elements. In the one opening, a spring element is positioned between the bushing and the bottom end of the opening. The shaft has a slot in the side surface of the shaft, opening onto the first end of the shaft.
    Type: Grant
    Filed: May 19, 1999
    Date of Patent: July 31, 2001
    Assignee: Exeter Engineering Inc.
    Inventors: David Leroy Carpenter, Jack L. Bedwell, John Lawrence Defty-Wallace