Patents by Inventor David M. Walden

David M. Walden 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).

  • Breathable fire hydrant rod
    Patent number: 7428910
    Abstract: The present invention relates to methods and devices for providing a fire hydrant actuator rod with additional structure for allowing air to reach the area of a fire hydrant below a secondary valve. Various embodiments include an actuator rod with openings and hollow portions and configured to provide air from the area of a hydrant above the secondary valve to the area of a hydrant below a secondary valve. In some embodiments of the present invention, a check valve is provided with the actuator rod that is adapted to prevent the flow of fluid in at least one direction.
    Type: Grant
    Filed: March 9, 2006
    Date of Patent: September 30, 2008
    Assignee: Davidson Hydrant Technologies, Inc.
    Inventors: Tom R. Davidson, Sr., Anthony Ferrari, David M. Walden, Matthew J. Rose