Patents by Inventor Nathan S. Dougherty, Jr.

Nathan S. Dougherty, Jr. 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).

  • Edgetone suppression device for wind tunnel walls
    Patent number: 3975955
    Abstract: A wind tunnel having a test section, located within a plenum, with the walls of the test section containing a plurality of small holes which permits flow, through the holes and plenum, for unchoking the test section when the wind tunnel is operating near sonic speeds. A splitter plate, to suppress edge tones, is positioned in each of the holes along the direction of flow which divides the holes into a left and a right half with respect to the direction of flow.
    Type: Grant
    Filed: June 27, 1975
    Date of Patent: August 24, 1976
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Nathan S. Dougherty, Jr., Charles F. Anderson