Patents by Inventor David A. Stignani

David A. Stignani 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).

  • Fluidic pressure ratio sensor
    Patent number: 4244212
    Abstract: A pressure ratio detector having a housing with a flow channel through the housing. A plug, having helical grooves, is positioned in the flow channel. A sudden expansion region is provided in the flow channel downstream of the plug which induces a nutation in the flow. The acoustic nutational frequencies are measured with a piezoelectric transducer to provide an output signal proportional to the pressure ratio across the device. An orifice device is provided in the inlet to adapt the device for measuring pressure ratios greater than 2.0.
    Type: Grant
    Filed: May 25, 1979
    Date of Patent: January 13, 1981
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: David A. Stignani