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:
Jul. 05, 1983
Filed:
Mar. 09, 1981
Applicant:
Inventors:
Assignee:
Gewerkschaft Eisenhutte Westfalia, Lunen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21C / ; E21C / ;
U.S. Cl.
CPC ...
299 11 ; 299 33 ; 299 43 ;
Abstract
The specification discloses a method of, and apparatus for, winning mineral material from the pillars left by the bord-and-pillar mining process. An arcuate longwall face, which may be convex or concave, is formed along a row of pillars. The mineral material in the pillars is won by mechanical winning means such as a plough, the pillars in each row being won in a non-uniform manner. Some of the mineral material won from the longwall face may be used to fill the stalls left between the pillars behind the longwall face.