Patents by Inventor Douglas A. Liston

Douglas A. Liston 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).

  • Patent number: 7686560
    Abstract: A rack and conveyor shuttle system for placing and retrieving articles of various sizes including a rack system having a shelving framework of at least two tubes spaced apart from one another at a distance, wherein the distance between the tubes is sufficient to support the article in a single stack and a motorized, conveyor shuttle system having at least two finger-like conveyors spaced apart from one another at a distance, wherein the distance between the finger-like conveyors is sufficient to move in between the two tubes so as to engage the article wherein the conveyor shuttle system is adapted to interlace in between the rack system for both placing and retrieving the article.
    Type: Grant
    Filed: December 8, 2005
    Date of Patent: March 30, 2010
    Assignee: Conestoga Cold Storage
    Inventors: Larry Hermas Laurin, Gavin Leigh Sargeant, Fred James Kuper, George Richard Pipes, Sergay Douglas Liston
  • Patent number: 5829323
    Abstract: A plier-type tool grips the spacing tube or ferrule which surrounds lengthy spikes used to secure a rain gutter to a building. The tool has legs that are pivotally connected and are used to open and close opposing arms that form a jaw. The inside surface of each arm of the jaw is fitted with half a cylindrical tube. The tube halves come together to form a single elongated tube at the front end of the nail spike grip. The tube is transversely positioned on the tool so as to generally form a T-shape with the legs of the nail spike grip. The tube fits within the channel of a rain gutter and is used to guide and support a spike as it is positioned within a spacing tube during installation. While supported by the tool the spike is driven through the inner wall of the gutter and into the trim of the building in order to secure the rain gutter thereto.
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: November 3, 1998
    Inventor: Douglas A. Liston