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:
Jan. 01, 1991
Filed:
Jun. 09, 1989
Applicant:
Inventors:
Stephen L Bessinger, Morgantown, WV (US);
Michael G Nelson, Bethel Park, PA (US);
Assignee:
Consolidation Coal Company, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21C / ;
U.S. Cl.
CPC ...
299-1 ; 299 45 ;
Abstract
The method and apparatus for sensing the coal-rock interface while longwall mining by placing the sensor in the cowl adjacent the shearer drum so that sensor on the leading drum can feedforward interface data for the control of the trailing shearer drum by properly positioning the drum while cutting.