Patents by Inventor Dax Widener

Dax Widener 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).

  • Thermal mass flow sensor with improved response across fluid types
    Patent number: 8160833
    Abstract: One embodiment of the present invention comprises a mass flow controller. The mass flow controller may comprise a pair of thermal sensing elements, a bridge circuit adapted to receive at least one first signal from the pair of thermal sensing elements and a differential amplifier adapted to (i) receive at least one bridge signal from the bridge circuit, and (ii) emit an output signal generally proportional to a flow rate of fluid passing through the mass flow controller. The mass flow controller is also comprised in one embodiment of a filter portion of a control module having one or more first filters comprising substantially permanent parameters adapted to provide a more accurate output signal for a baseline fluid upon a change in the flow rate and one or more second filters comprising variable parameters, with each of the one or more second filters being adapted to provide a more accurate output signal for non-baseline fluids upon a change in the flow rate.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: April 17, 2012
    Assignee: Hitachi Metals, Ltd
    Inventors: Alexei V. Smirnov, Michael Lynn Westra, Dax Widener
  • THERMAL MASS FLOW SENSOR WITH IMPROVED RESPONSE ACROSS FLUID TYPES
    Publication number: 20110015791
    Abstract: One embodiment of the present invention comprises a mass flow controller. The mass flow controller may comprise a pair of thermal sensing elements, a bridge circuit adapted to receive at least one first signal from the pair of thermal sensing elements and a differential amplifier adapted to (i) receive at least one bridge signal from the bridge circuit, and (ii) emit an output signal generally proportional to a flow rate of fluid passing through the mass flow controller. The mass flow controller is also comprised in one embodiment of a filter portion of a control module having one or more first filters comprising substantially permanent parameters adapted to provide a more accurate output signal for a baseline fluid upon a change in the flow rate and one or more second filters comprising variable parameters, with each of the one or more second filters being adapted to provide a more accurate output signal for non-baseline fluids upon a change in the flow rate.
    Type: Application
    Filed: July 14, 2009
    Publication date: January 20, 2011
    Applicant: ADVANCED ENERGY INDUSTRIES, INC.
    Inventors: Alexei V. Smirnov, Michael Lynn Westra, Dax Widener