The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 1996
Filed:
Sep. 06, 1994
Applicant:
Inventor:
Dennis Mraz, Saskatoon, CA;
Assignee:
Deep Shaft Technology, Inc., Alberta, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21D / ;
U.S. Cl.
CPC ...
299 18 ; 187405 ;
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.