Patents by Inventor Alfred G. Berger

Alfred G. Berger 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).

  • Low turbulence wind tunnel stilling chamber
    Patent number: 4281540
    Abstract: A wind tunnel in which high energy laser beam impingement studies can be ducted such that beam distortion and degradation is substantially precluded. Uniform, low turbulence flow in which thermal blooming, creation of wakes is substantially eliminated is attained by providing an improved elongated cylindrical settling chamber having a gradual turning radius. A transverse aerodynamic window is located in the low velocity flow turning region of the settling chamber which allows the entry of the laser beam and the exhaust of a turbulent sonic free-jet constituting 10 percent of the total fluid flow through the wind tunnel.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: August 4, 1981
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Roland E. Lee, Alfred G. Berger, Dennis A. Sowers, Richard J. Sergeant, Hermann W. Behrens