Patents Assigned to Deep Shaft Technology, Inc.
  • Method and apparatus for developing shafts using small diameter shafts
    Patent number: 5513903
    Abstract: A mining method and apparatus includes drilling two relatively small diameter shafts in proximity to each other, and operating a single hoisting system between the two shafts. The hoisting system includes a hoist that simultaneously moves first and second conveyances in opposite directions respectively in the first and second shafts.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: May 7, 1996
    Assignee: Deep Shaft Technology, Inc.
    Inventor: Dennis Mraz