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:
Jun. 27, 1989
Filed:
Oct. 09, 1987
Applicant:
Inventor:
Philip B Cowan, Littleton, CO (US);
Assignee:
Tusco, Incorporated, Commerce City, CO (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21F / ; E21F / ; E21F / ;
U.S. Cl.
CPC ...
405132 ; 405303 ; 299 10 ; 299 12 ;
Abstract
A method for preventing the formation of acidic mine water wherein inert gas in introduced into a mine cavity under positive pressure to displace oxygen contained therein. Upon detection of the displacement of substantially all of the oxygen from within the mine cavity, the mine cavity is permitted to flood and seal with water.