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. 31, 1988
Filed:
Dec. 10, 1986
Applicant:
Inventors:
Bruce W Gash, Tulsa, OK (US);
Thomas S Buxton, Tulsa, OK (US);
Assignee:
Amoco Corporation, Chicago, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21C / ;
U.S. Cl.
CPC ...
299 11 ; 166256 ; 166302 ;
Abstract
Disclosed is a process for controlling subsidence during underground gasification of coal. Prior to the complete coal gasification step, holes are provided extending from the bottom to the top of the coal seam and these holes filled with heat resistant support material. Thereafter, the complete gasification process is carried out.