Patents by Inventor Timothy Charles Draper

Timothy Charles Draper 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).

  • Screw pump having varying pitches
    Patent number: 8827669
    Abstract: A screw pump includes a stator having a fluid inlet and a fluid outlet, the stator housing first and second externally threaded, tapered rotors mounted on respective shafts and adapted for counter-rotation within the stator to compress fluid passing from the fluid inlet to the fluid outlet, wherein the threads have a pitch that increases towards the fluid outlet.
    Type: Grant
    Filed: December 4, 2006
    Date of Patent: September 9, 2014
    Assignee: Edwards Limited
    Inventors: Michael Henry North, Neil Turner, Tristan Richard Ghislain Davenne, Timothy Charles Draper
  • Screw Pump
    Publication number: 20100296958
    Abstract: A screw pump (10) comprises a stator (12) having a fluid inlet (18) and a fluid outlet (20), the stator housing first and second externally threaded, tapered rotors (26, 28) mounted on respective shafts and adapted for counter-rotation within the stator (12) to compress fluid passing from the fluid inlet to the fluid outlet, wherein the threads (30, 32) have a pitch that increases towards the fluid outlet (20).
    Type: Application
    Filed: December 4, 2006
    Publication date: November 25, 2010
    Inventors: Michael Henry North, Neil Turner, Tristan Richard Ghislain Davenne, Timothy Charles Draper
  • Flange clamp
    Patent number: 6473945
    Abstract: A flexible clamp comprising a plurality of plastics links each link being a snap-fit with the next adjacent link thereby permitting a user to alter the length of the chain by the addition or subtraction of one or more links, and means for latching the free ends of the chain together.
    Type: Grant
    Filed: August 30, 2000
    Date of Patent: November 5, 2002
    Assignee: The BOC Group plc
    Inventor: Timothy Charles Draper