Patents by Inventor Stephen Daniel Walker

Stephen Daniel Walker 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).

  • Apparatus for automatic identification of gas samples
    Patent number: 5920069
    Abstract: The gas sample identification apparatus transmits at least one beam of light of predefined frequency band through a gas sample present in a gas sampling chamber. The presence and concentration of various agents in the gas sample are determined by a linear variable filter that selectively passes the light beam transmitted through the gas sample chamber to an array of detectors. The detectors are positioned to receive only a narrow passband component of the light beam. The output signals from the array of detectors is processed by a multivariate statistical processor to accurately identify both the presence and concentration of one or more agents contained in the gas sample.
    Type: Grant
    Filed: October 7, 1997
    Date of Patent: July 6, 1999
    Assignee: Datex-Ohmeda, Inc.
    Inventors: Russell John Fischer, Clement Lim Yu, Patrick Francis Crane, Stephen Daniel Walker
  • Apparatus for automatic identification of gas samples
    Patent number: 5731581
    Abstract: The gas sample identification apparatus transmits at least one beam of light of predefined frequency band through a gas sample present in a gas sampling chamber. The presence and concentration of various agents in the gas sample are determined by a linear variable filter that selectively passes the light beam transmitted through the gas sample chamber to an array of detectors. The detectors are positioned to receive only a narrow passband component of the light beam. The output signals from the array of detectors is processed by a multivariate statistical processor to accurately identify both the presence and concentration of one or more agents contained in the gas sample.
    Type: Grant
    Filed: March 13, 1995
    Date of Patent: March 24, 1998
    Assignee: Ohmeda Inc.
    Inventors: Russell John Fischer, Clement Lim Yu, Patrick Francis Crane, Stephen Daniel Walker