Patents by Inventor Stephen Dowdeswell

Stephen Dowdeswell 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).

  • Vacuum Pump
    Publication number: 20070274822
    Abstract: A vacuum pumping arrangement is described for evacuating a load lock chamber. A booster pump comprises a molecular drag stage and a multi-stage centrifugal compressor mechanism. A backing pump comprises a multi-stage centrifugal compressor mechanism exhausting pumped fluid at atmospheric pressure. Such arrangements can reduce noise, size and vibration levels associated with conventional load lock pumping arrangements.
    Type: Application
    Filed: December 23, 2004
    Publication date: November 29, 2007
    Inventors: Michael Liu, Stephen Dowdeswell, Nigel Schofield