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:
Aug. 20, 1991
Filed:
Jun. 30, 1989
Applicant:
Inventors:
LaVaun S Merrill, Jr, Englewood, CO (US);
Larry D Wheaton, Littleton, CO (US);
Assignee:
Marathon Oil Company, Findlay, OH (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C10G / ;
U.S. Cl.
CPC ...
208407 ; 208409 ; 208424 ;
Abstract
A process for retorting oil shale in a vertical retort. Recycle gas containing steam and produced gas is separated from the retort off-gas and used to heat the oil shale. The steam is present in amount by volume of the recycle gas of at least 40% and preferably 70%. The minimum particle size of the oil shale is such that the particles are retained on a screen having 1/4 inch openings. The maximum particle size is such that the particles are capable of passing through a screen having 3 inch openings.