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. 09, 1979
Filed:
Dec. 27, 1977
Applicant:
Inventor:
Robert D Stewart, Yorba Linda, CA (US);
Assignee:
Occidental Oil Shale, Inc., Grand Junction, CO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; C01F / ;
U.S. Cl.
CPC ...
166261 ; 166259 ; 166288 ; 166303 ; 208 / ; 423155 ;
Abstract
Leaching of water-soluble constituents from particles containing treated oil shale and including oxides of alkaline earth metals, such as particles in an in situ oil shale retort, is inhibited by contacting the particles with carbon dioxide in the presence of water for a sufficient time to produce a substantially water-insoluble and/or impermeable barrier of carbonates of alkaline earth metals at the surface of the particles.