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:
Aug. 18, 1987
Filed:
Jun. 13, 1986
Walter L Richards, Huntington Beach, CA;
Roger L Henderson, Bluefield, WV (US);
George N Aul, Richlands, VA (US);
Barry W Pauley, West Blocton, AL (US);
Methane Drainage Ventures, Placentia, CA (US);
Abstract
A process is provided for sealing a degas hole in a coal seam prior to mining of the coal therein which includes the steps of inserting a perforated liner into the degas hole substantially the entire length thereof and pumping grout down the center of the perforated liner to the end of the degas hole. As the end of the degas hole is filled with grout, pressure is increased to force grout through the perforations in the liner to fill the degas hole along the entire length thereof. The perforated liner is also useful in the election of methane gas prior to sealing of the degas hole and further ensures a clear path through the degas hole so that sloughing, or caving, of the degas hole prior to grouting does not interfere with the complete sealing of the degas hole.