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:
Apr. 03, 1984
Filed:
Feb. 05, 1982
Applicant:
Inventor:
William A Sweeney, Larkspur, CA (US);
Assignee:
Chevron Research Company, San Francisco, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21C / ;
U.S. Cl.
CPC ...
299 11 ; 405267 ;
Abstract
An improvement in room-and-pillar mining of underground oil shale deposits in which: spaces between the pillars are filled with a fluid cementitious composition comprising spent oil shale and a binder to form floor-to-ceiling bodies of the composition; the bodies are allowed to harden to form support members for supporting the roof of the mine cavity; and the pillars are thereafter mined from the mine cavity.