Patents by Inventor Donald H. Stedman

Donald H. Stedman 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).

  • System and method for quantifying the presence of components in the exhaust of commercial and/or heavy-duty vehicles
    Patent number: 9057664
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: June 16, 2015
    Assignee: Envirotest Systems Holdings Corp.
    Inventor: Donald H. Stedman
  • SYSTEM AND METHOD FOR QUANTIFYING THE PRESENCE OF COMPONENTS IN THE EXHAUST OF COMMERCIAL AND/OR HEAVY-DUTY VEHICLES
    Publication number: 20140033796
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Application
    Filed: January 8, 2013
    Publication date: February 6, 2014
    Applicant: Envirotest Systems Holdings Corp.
    Inventor: Donald H. Stedman
  • SYSTEM AND METHOD FOR QUANTIFYING THE PRESENCE OF COMPONENTS IN THE EXHAUST OF COMMERCIAL AND/OR HEAVY-DUTY VEHICLES
    Publication number: 20130233052
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Application
    Filed: April 29, 2013
    Publication date: September 12, 2013
    Applicant: Envirotest Systems Holdings Corp.
    Inventor: Donald H. Stedman
  • System and method for quantifying the presence of components in the exhaust of commercial and/or heavy-duty vehicles
    Patent number: 8429957
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: April 30, 2013
    Assignee: Envirotest Systems Holdings Corp.
    Inventor: Donald H. Stedman
  • System and method for quantifying the presence of components in the exhaust of commercial and/or heavy-duty vehicles
    Patent number: 8347701
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: January 8, 2013
    Assignee: Envirotest Systems Holdings Corp.
    Inventor: Donald H. Stedman
  • SYSTEM AND METHOD FOR QUANTIFYING THE PRESENCE OF COMPONENTS IN THE EXHAUST OF COMMERCIAL AND/OR HEAVY-DUTY VEHICLES
    Publication number: 20130000396
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, extractive sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Application
    Filed: September 14, 2012
    Publication date: January 3, 2013
    Inventor: Donald H. Stedman
  • System and method for quantifying the presence of components in the exhaust of commercial and/or heavy-duty vehicles
    Patent number: 8266952
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, extractive sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: September 18, 2012
    Assignee: Envirotest Systems Holdings Corp.
    Inventor: Donald H. Stedman
  • SYSTEM AND METHOD FOR QUANTIFYING THE PRESENCE OF COMPONENTS IN THE EXHAUST OF COMMERCIAL AND/OR HEAVY-DUTY VEHICLES
    Publication number: 20120130584
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Application
    Filed: January 31, 2012
    Publication date: May 24, 2012
    Inventor: Donald H. Stedman
  • SYSTEM AND METHOD FOR QUANTIFYING THE PRESENCE OF COMPONENTS IN THE EXHAUST OF COMMERCIAL AND/OR HEAVY-DUTY VEHICLES
    Publication number: 20110265552
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Application
    Filed: June 3, 2011
    Publication date: November 3, 2011
    Inventor: Donald H. Stedman
  • SYSTEM AND METHOD FOR QUANTIFYING THE PRESENCE OF COMPONENTS IN THE EXHAUST OF COMMERCIAL AND/OR HEAVY-DUTY VEHICLES
    Publication number: 20110162435
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, extractive sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Application
    Filed: March 21, 2011
    Publication date: July 7, 2011
    Inventor: Donald H. Stedman
  • System and method for quantifying the presence of components in the exhaust of commercial and/or heavy-duty vehicles
    Patent number: 7930931
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, extractive sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: April 26, 2011
    Assignee: Environmental Systems Products Holdings Inc.
    Inventor: Donald H. Stedman
  • SYSTEM AND METHOD FOR QUANTIFYING THE PRESENCE OF COMPONENTS IN THE EXHAUST OF COMMERCIAL AND/OR HEAVY-DUTY VEHICLES
    Publication number: 20090272181
    Abstract: A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, extractive sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions.
    Type: Application
    Filed: May 2, 2008
    Publication date: November 5, 2009
    Inventor: Donald H. Stedman
  • Remote emissions sensing system and method incorporating spectral matching by data interpolation
    Patent number: 7400398
    Abstract: A system and method for correcting for “wavelength drift” in an RES system. One advantage provided by the invention includes the ability to correct for offset amounts of “wavelength drift” that are not divisible by an integer number of pixels (e.g., fraction pixel offset amounts) in an optical detector used in the RES system. Correction of fractional pixel offset amounts may enhance spectral matching, enable substantially continuous calibration of an RES system, and/or other benefits.
    Type: Grant
    Filed: May 9, 2006
    Date of Patent: July 15, 2008
    Assignee: Environmental Systems Products Holdings Inc.
    Inventor: Donald H. Stedman
  • System and method for calibrating remote emissions sensing instruments
    Patent number: 7359804
    Abstract: A system and method is provided for obtaining calibration curves for CO and CO2 during laboratory calibration of one or more remote emissions sensing (RES) instruments, and for self-calibration of on-road RES instruments to compensate for changes in background CO and CO2 column densities.
    Type: Grant
    Filed: August 25, 2005
    Date of Patent: April 15, 2008
    Assignee: Environmental Systems Products Holdings Inc.
    Inventors: Mitchell Jared Williams, Donald H. Stedman
  • Exhaust opacity measuring device
    Patent number: 7274994
    Abstract: A remote emissions sensing system and method for sensing exhaust emissions from motor vehicles is provided where the system determines the opacity of an exhaust plume. The system comprises a radiation source that emits radiation which is passed through the exhaust plume of a motor vehicle to one or more detectors arranged to receive the radiation. Multiple wavelength opacity measuring embodiments and monochromatic wavelength opacity measuring embodiments are disclosed.
    Type: Grant
    Filed: November 9, 2005
    Date of Patent: September 25, 2007
    Assignee: Environmental Systems Products Holdings Inc.
    Inventors: Donald H. Stedman, Gary A. Bishop, Gary Full
  • Multilane remote sensing device
    Patent number: 7164132
    Abstract: A remote sensing device is provided to detect the emissions of passing vehicles. Preferably, the device detects the emissions of individual vehicles traveling on a roadway of more than one traffic lane. The remote sensing device may preferably detect the emissions due to an individual vehicle in situations where more than one vehicle is present. The device is capable of determining which sensed emission data corresponds to which vehicle exhaust plume.
    Type: Grant
    Filed: July 18, 2001
    Date of Patent: January 16, 2007
    Assignee: Envirotest Systems Corp.
    Inventors: John Didomenico, James Johnson, Donald H. Stedman, Gary A. Bishop, W. John Williams
  • Exhaust opacity measuring device
    Patent number: 7016789
    Abstract: A remote emissions sensing system and method for sensing exhaust emissions from motor vehicles is provided where the system determines the opacity of an exhaust plume. The system comprises a radiation source that emits radiation which is passed through the exhaust plume of a motor vehicle to one or more detectors arranged to receive the radiation. Multiple wavelength opacity measuring embodiments and monochromatic wavelength opacity measuring embodiments are disclosed.
    Type: Grant
    Filed: February 3, 2004
    Date of Patent: March 21, 2006
    Assignee: Environmental Systems Products Holdings Inc.
    Inventors: Donald H. Stedman, Gary A. Bishop, Gary Full
  • Exhaust opacity measuring device
    Publication number: 20040155191
    Abstract: A remote emissions sensing system and method for sensing exhaust emissions from motor vehicles is provided where the system determines the opacity of an exhaust plume. The system comprises a radiation source that emits radiation which is passed through the exhaust plume of a motor vehicle to one or more detectors arranged to receive the radiation. Multiple wavelength opacity measuring embodiments and monochromatic wavelength opacity measuring embodiments are disclosed.
    Type: Application
    Filed: February 3, 2004
    Publication date: August 12, 2004
    Inventors: Donald H. Stedman, Gary A. Bishop, Gary Full
  • Exhaust opacity measuring device
    Patent number: 6701256
    Abstract: A remote emissions sensing system and method for sensing exhaust emissions from motor vehicles is provided where the system determines the opacity of an exhaust plume. The system comprises a radiation source that emits radiation which is passed through the exhaust plume of a motor vehicle to one or more detectors arranged to receive the radiation. Multiple wavelength opacity measuring embodiments and monochromatic wavelength opacity measuring embodiments are disclosed.
    Type: Grant
    Filed: March 11, 2002
    Date of Patent: March 2, 2004
    Assignee: Environmental Systems Products Holdings Inc.
    Inventors: Donald H. Stedman, Gary A. Bishop, Gary Full
  • Exhaust opacity measuring device
    Publication number: 20030225532
    Abstract: A remote emissions sensing system and method for sensing exhaust emissions from motor vehicles is provided where the system determines the opacity of an exhaust plume. The system comprises a radiation source that emits radiation which is passed through the exhaust plume of a motor vehicle to one or more detectors arranged to receive the radiation. Multiple wavelength opacity measuring embodiments and monochromatic wavelength opacity measuring embodiments are disclosed.
    Type: Application
    Filed: March 11, 2002
    Publication date: December 4, 2003
    Inventors: Donald H. Stedman, Gary A. Bishop, Gary Full