Patents by Inventor Donald Stedman

Donald 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).

  • Remote emissions sensing system and method incorporating spectral matching by data interpolation
    Publication number: 20070263213
    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: Application
    Filed: May 9, 2006
    Publication date: November 15, 2007
    Inventor: Donald Stedman
  • Exhaust opacity measuring device
    Publication number: 20060074567
    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: November 9, 2005
    Publication date: April 6, 2006
    Applicant: Environmental Systems Products Holdings Inc.
    Inventors: Donald Stedman, Gary Bishop, Gary Full
  • System and method for calibrating remote emissions sensing instruments
    Publication number: 20060047445
    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: Application
    Filed: August 25, 2005
    Publication date: March 2, 2006
    Inventors: Mitchell Williams, Donald Stedman
  • 3-D molded watershield resonance frequency diffuser
    Publication number: 20050210779
    Abstract: A molded water-shield integrated between an exterior panel assembly and a trim panel of a vehicle. The molded water-shield includes a semi-rigid barrier sheet and a series of resonance frequency diffusion (RFD) reliefs formed in the semi-rigid barrier sheet. The RFD reliefs diffuse sound waves directed at the semi-rigid barrier sheet.
    Type: Application
    Filed: February 15, 2005
    Publication date: September 29, 2005
    Inventors: Chi Koa, Donald Stedman
  • 3-D MOLDED WATERSHIELD RESONANCE FREQUENCY DIFFUSER
    Publication number: 20050093334
    Abstract: A molded water-shield integrated between an exterior panel assembly and a trim panel of a vehicle. The molded water-shield includes a semi-rigid barrier sheet and a series of resonance frequency diffusion (RFD) reliefs formed in the semi-rigid barrier sheet. The RFD reliefs diffuse sound waves directed at the semi-rigid barrier sheet.
    Type: Application
    Filed: October 30, 2003
    Publication date: May 5, 2005
    Inventors: Chi Koa, Donald Stedman