Patents by Inventor David Rhodri Leyshon

David Rhodri Leyshon 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).

  • Multistage vacuum pump with interstage inlet
    Patent number: 6106223
    Abstract: A vacuum pump comprising a plurality of vacuum stages and having a first pump inlet through which gas can pass through all the pump stages and a second inlet through which gas can enter the pump at an interstage location and pass only through subsequent stages of the pump, wherein the pump stages prior to the interstage are sized differently to these stages subsequent to the interstages such that the pump overall suits the pressure requirements and pumping capacity of the different systems attached to the first and second inlet, respectively.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: August 22, 2000
    Assignee: The BOC Group plc
    Inventor: David Rhodri Leyshon