Patents by Inventor Joseph Plotkowiak

Joseph Plotkowiak 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).

  • Compressor with pump recycling for isotopic separation through gaseous scattering
    Patent number: 4431377
    Abstract: A compressor which compresses a principal flow at low pressure and recompses a secondary flow at medium pressure to deliver a common flow at high pressure. The compressor includes, in addition to compression devices for the principal flow, static devices forming an induction nozzle housed in the scatterer and devices to introduce therein the secondary flow, the principal flow constituting the drive flow.
    Type: Grant
    Filed: March 5, 1981
    Date of Patent: February 14, 1984
    Assignees: Hispano-Suiza, Societe Nationale d'Etude et de Construction Moteurs d'Aviation SNECMA
    Inventors: Joseph Plotkowiak, Herve A. Quillevere
  • Magnetic control closure system
    Patent number: 4141547
    Abstract: An annular seal is clamped in the active position of closure between statary knife-edges on the rotor of a rotating machine and movable knife-edges of a support member which can be displaced between an active position of magnetic coupling with the rotor and an inactive position of withdrawal from the rotor. The magnetic means have a second stable state of attraction in which the movable support member remains separated from the rotor in the inactive position.
    Type: Grant
    Filed: July 13, 1977
    Date of Patent: February 27, 1979
    Assignee: Societe Nationale d'Etude et de Construction de Moteurs d'Aviation
    Inventors: Claude E. D. Duquenne, Joseph Plotkowiak