Patents by Inventor Stewart J. Smith

Stewart J. Smith 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).

  • Method and system for estimating gas production by a landfill or other subsurface source
    Patent number: 6611760
    Abstract: A new and useful method and system for estimating LFG generation and gas permeability in a landfill or other subsurface-gas producing body of material is provided. The gas generation rate in a portion of a landfill or other subsurface-gas producing body of material is estimated by obtaining a time history record of atmospheric pressure that is representative of atmospheric pressure at a surface boundary of the portion of the landfill or the subsurface gas producing body of material, measuring the gas pressure at least at one selected location at the landfill (or subsurface body of material) site over a time period that is included in the time history record, and using the atmospheric pressure and the measured gas pressure over the time period to estimate LFG generation rate and gas permeability of the portion of the landfill or the subsurface gas producing body of material.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: August 26, 2003
    Assignee: Hydro Geo Chem, Inc.
    Inventors: Harold W. Bentley, Gary R. Walter, Stewart J. Smith, Jinshan Tang, Christian T. Williamson
  • METHOD AND SYSTEM FOR ESTIMATING GAS PRODUCTION BY A LANDFILL OR OTHER SUBSURFACE SOURCE
    Publication number: 20030114988
    Abstract: A new and useful method and system for estimating LFG generation and gas permeability in a landfill or other subsurface-gas producing body of material is provided. The gas generation rate in a portion of a landfill or other subsurface-gas producing body of material is estimated by obtaining a time history record of atmospheric pressure that is representative of atmospheric pressure at a surface boundary of the portion of the landfill or the subsurface gas producing body of material, measuring the gas pressure at least at one selected location at the landfill (or subsurface body of material) site over a time period that is included in the time history record, and using the atmospheric pressure and the measured gas pressure over the time period to estimate LFG generation rate and gas permeability of the portion of the landfill or the subsurface gas producing body of material.
    Type: Application
    Filed: December 14, 2001
    Publication date: June 19, 2003
    Inventors: Harold W. Bentley, Gary R. Walter, Stewart J. Smith, Jinshan Tang, Christian T. Williamson