Patents by Inventor Walter Pilpel

Walter Pilpel 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).

  • Hollow composite compressor blade
    Patent number: 3981616
    Abstract: A hollow composite compressor blade having two airfoil-shaped half sections formed of composite material bonded together, one or more span members of metal or composite material bonded and integral therewith and an appropriate root structure. The composite material being preferably silicon carbide coated boron filament with an aluminum matrix for the shell.
    Type: Grant
    Filed: October 22, 1974
    Date of Patent: September 21, 1976
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Hans Stargardter, Walter Pilpel