Patents by Inventor Hugh Hambly

Hugh Hambly 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).

  • Bidirectional check valve for hydraulic system
    Patent number: 6216729
    Abstract: A bidirectional check valve controls movement of fluid. A valve body has an opening, a further opening and a passage connecting the opening and the further opening. A poppet is disposed within the passage of the valve body, and a spring is coupled to the poppet. A further poppet is disposed within the passage formed in the first mentioned poppet, and a further spring is coupled to the poppet and to the further poppet. When fluid passing through the opening in the valve body exerts a force on the poppet that is greater than the spring force, the further portion of the outer surface of the poppet is directed away from the further portion of the wall of the passage and permits the fluid to flow from the opening in the valve body through a channel and to the further opening in the valve body.
    Type: Grant
    Filed: July 10, 2000
    Date of Patent: April 17, 2001
    Assignee: Parsons & Whittemore, Inc.
    Inventors: Hugh Hambly, Brian Thornton