Patents by Inventor David W. Birch

David W. Birch 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).

  • Production of constant composition gas mixture streams
    Patent number: 6382227
    Abstract: Gas mixtures having precise compositions are prepared by separately pumping the components in liquid phase through piping, vaporizing the components, blending the components and analyzing the mixture for composition. A signal sent to a control unit causes any necessary change in the rate of pumping of the liquid components to reduce the difference between the measured concentration and the desired concentration. When the composition is within desired limits it is charged into gas cylinders.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: May 7, 2002
    Assignee: The BOC Group, Inc.
    Inventors: David W. Birch, André Micke, Shuen-Cheng Hwang, Lesli B. Cosey, Carl W. Schmidt, Robert F. Phillips, D. Bruce Wilson
  • Gas capsule and gas delivery system
    Patent number: 6047865
    Abstract: A capsule for storing a fluid, for example helium, under pressure comprises a hollow body from which extends a hollow neck. A stopper engages with the neck in a fluid tight manner. The stopper includes a main hollow portion and a stem extending outwardly from the main hollow portion. The root of the stem where it joins the main hollow portion forms a frangible section which, when broken, will allow fluid in the capsule to escape under pressure.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: April 11, 2000
    Assignee: The BOC Group plc
    Inventors: Evelyn A. Shervington, David W. Birch, David Surman
  • Gas delivery system
    Patent number: 5954232
    Abstract: A gas delivery system includes a capsule for storing a propellant fluid, e.g. helium under pressure, e.g. between about 60 and 80 bar. The capsule is provided with a stopper having a stem formed with a frangible section. In use, mechanical means is employed to rupture the stem about the frangible section to release the fluid under high pressure.
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: September 21, 1999
    Assignee: The BOC Group plc
    Inventors: Evelyn A. Shervington, David W. Birch
  • Gas capsule
    Patent number: 5845811
    Abstract: A capsule for storing a propellant fluid, for example, helium under pressure comprises a hollow body which includes a frangible area. An anchor member attaches an arm to the frangible area such that when a force is applied to the arm, said force together with the helium under pressure will cause the frangible area to rupture outwardly of the hollow body thereby to release the helium.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: December 8, 1998
    Assignee: The BOC Group Plc
    Inventors: Evelyn A. Shervington, David W. Birch