Patents by Inventor John R. Barbic

John R. Barbic 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).

  • Variable stiffness oil film damper
    Patent number: 4867655
    Abstract: The critical speed of a bearing supported rotating shaft is changed or controlled by dimensioning the oil squeeze film damper so that the volumen of oil is selected to produce a spring rate that when added to the mechanical spring rate will attain the overall spring rate of the system. The spring rate of the oil becomes effective when the volume is at a predetermined value which is at a level higher than heretofore known oil squeeze film dampers.
    Type: Grant
    Filed: March 14, 1988
    Date of Patent: September 19, 1989
    Assignee: United Technologies Corporation
    Inventors: John R. Barbic, Kurt L. Nichol, David H. Hibner, David R. Szafir