Patents by Inventor Stuart F. Metcalfe

Stuart F. Metcalfe 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).

  • Light source for open-path gas monitoring
    Patent number: 6781695
    Abstract: An improved light source for use in an opacity monitor (transmissometer) that reduces the variation in light intensity across a projected light beam to enable a more accurate and stable method for measuring the opacity of gases in a stack/duct, especially at low values (e.g., <10%) of opacity while operating within specific performance requirements.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: August 24, 2004
    Assignee: Land Instruments International, Inc.
    Inventors: Richard Hovan, Stuart F. Metcalfe, Derek D. Stuart
  • Light source for open-path gas monitoring
    Publication number: 20030038940
    Abstract: An improved light source for use in an opacity monitor (transmissometer) that reduces the variation in light intensity across a projected light beam to enable a more accurate and stable method for measuring the opacity of gases in a stack/duct, especially at low values (e.g., <10%) of opacity while operating within specific performance requirements.
    Type: Application
    Filed: September 26, 2001
    Publication date: February 27, 2003
    Inventors: Stuart F. Metcalfe, Derek D. Stuart