Patents by Inventor Malcolm C. Hanson

Malcolm C. Hanson 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).

  • Fluid flow control valves
    Patent number: 4738432
    Abstract: A valve such as penstock with a gate (13) which slides across an opening in a frame (10, 11, 12). On at least one side of the gate (13) is a two-part sealing strip consisting of resilient layer (22) and a superimposed bearing portion (23). Attached to or integral with bearing portion (23) is a thickened part (24) which limits the maximum compression of the resilient layer (22) when the valve is closed.
    Type: Grant
    Filed: May 11, 1987
    Date of Patent: April 19, 1988
    Assignee: Simon-Hartley Limited
    Inventors: Frederick B. Gardner, Malcolm C. Hanson, Kenneth J. Richardson