Patents by Inventor Carl W. Schmidt

Carl W. Schmidt 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).

  • Gas fumigation method and system
    Patent number: 6615534
    Abstract: A method and system are disclosed for fumigating at least one region with a nonflammable gaseous mixture including phosphine. A sensor senses the concentration of phosphine for atmosphere of the region and a flow controller controls flow to the region in response to the sensed concentration. A recycling passage removes a portion of the atmosphere from the region and returns the atmosphere to create a recycle flow through the region. In addition, a gas mixing system is provided to supply the non-flammable mixture by mixing phosphine from a phosphine source and an inert substance from an inert substance source.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: September 9, 2003
    Assignee: Cytec Canada, Inc.
    Inventors: Dennis Smithyman, Carl W. Schmidt, Sloane R. Six
  • 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 fumigation method and system
    Patent number: 6047497
    Abstract: A method and system are disclosed for fumigating at least one region with a non-flammable gaseous mixture including phosphine. A sensor senses the concentration of phosphine for atmosphere of the region and a flow controller controls flow to the region in response to the sensed concentration. A recycling passage removes a portion of the atmosphere from the region and returns the atmosphere to create a recycle flow through the region. In addition, a gas mixing system is provided to supply the non-flammable mixture by mixing phosphine from a phosphine source and an inert substance from an inert substance source.
    Type: Grant
    Filed: March 18, 1997
    Date of Patent: April 11, 2000
    Assignee: The BOC Group, Inc.
    Inventors: Dennis Smithyman, Carl W. Schmidt, Sloane R. Six