Patents Assigned to Hydro Extraction Inc.
  • Underground hydraulic mining method and apparatus
    Patent number: 5435628
    Abstract: An underground method and apparatus for recovery of mineral deposits from sloping seams including high pressure water jet mineral dislodgement from underground deposits and water borne transport of dislodged mineral to an underground recovery site, and compressed air injection for transport of water borne mineral deposits from the underground recovery site to the surface.
    Type: Grant
    Filed: April 12, 1994
    Date of Patent: July 25, 1995
    Assignee: Hydro Extraction Inc.
    Inventors: Warren G. Montgomery, Price M. Campbell