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. 12, 1983
Filed:
Jan. 19, 1981
Bernard E Weichman, Houston, TX (US);
Multi Mineral Corporation, Houston, TX (US);
Abstract
A method for the in situ processing of oil shale ore includes the establishment of underground stopes by removing from each a portion of the oil shale ore therein, rubblizing the remaining ore in each stope, extracting the rubblized ore and crushing it to obtain a desired particle size for subsequent processing, and restoring the sized oil shale particles to the stope by backfilling the stope as the rubble is extracted. The stope is maintained substantially filled with ore to provide lateral support to the side walls and reduce the likelihood of caving in the stope. The oil shale is retorted by injection of hot gas into the stope, and residual carbon is recovered from the retorted ore as producer fuel gas. The sensible heat in the ore may thereafter be recovered for use in retorting oil shale ore in an adjacent stope.