Patents by Inventor Wade J. Craddock

Wade J. Craddock 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).

  • Check valves
    Patent number: 7445028
    Abstract: Duck-bill type check valves each include an inlet, an outlet spaced longitudinally from the inlet, and a bill adjacent the outlet and having at least one fold extending longitudinally along the bill for enabling unfolding of the at least one fold to open the outlet and permit the flow of fluid from the inlet for discharge through an opening at the outlet in response to minimum fluid forces upon the bill, and to provide the opening with an increased maximum available perimeter.
    Type: Grant
    Filed: September 26, 2005
    Date of Patent: November 4, 2008
    Assignee: General Rubber Corporation
    Inventors: Lloyd B. Aanonsen, Wade J. Craddock, Richard J. DiGiovanni