Patents by Inventor Gordon Alexander Marshall

Gordon Alexander Marshall 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).

  • Inertization system for highwall mining
    Patent number: 5997100
    Abstract: A highwall mining system for mining aggregate material from a seam (8) includes a mining device (9) for cutting aggregate material from the seam (8) thereby to form a drive (10) in the seam (8), a conveying device (11) for conveying mined aggregate material from the drive (10), and a circulation device located on or in the region of the mining device (9) for circulating the atmosphere at least at the forward end of the drive (10). The system further includes an inertization device (60, 61, 63, 71) for maintaining the concentration of oxygen in the atmosphere in the drive (10) lower than the concentration of oxygen required for explosion of methane gas and/or dusts and/or other flammable materials in the drive (10).
    Type: Grant
    Filed: October 9, 1998
    Date of Patent: December 7, 1999
    Assignee: The Broken Hill Proprietary Company Limited
    Inventors: Gordon Alexander Marshall, Geoffrey Raymond Rigby
  • Inertization system for highwall mining
    Patent number: 5820223
    Abstract: A highwall mining system for mining aggregate material from a seam (8) includes a mining device (9) for cutting aggregate material from the seam (8) thereby to form a drive (10) in the seam (8), a conveying device (11) for conveying mined aggregate material from the drive (10), and a circulation device located on or in the region of the mining device (9) for circulating the atmosphere at least at the forward end of the drive (10). The system further includes an inertization device (60, 61, 63, 71) for maintaining the concentration of oxygen in the atmosphere in the drive (10) lower than the concentration of oxygen required for explosion of methane gas and/or dusts and/or other flammable materials in the drive (10).
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: October 13, 1998
    Assignee: The Broken Hill Proprietary Company Limited
    Inventors: Gordon Alexander Marshall, Geoffrey Raymond Rigby