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. 17, 1979
Filed:
May. 31, 1977
Applicant:
Inventors:
Robert S Burton, Grand Junction, CO (US);
Carl C Chambers, Grand Junction, CO (US);
Assignee:
Occidental Oil Shale, Inc., Grand Junction, CO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ;
U.S. Cl.
CPC ...
166 64 ; 166164 ; 166251 ; 299-2 ;
Abstract
An apparatus is provided for determining the locus of a processing zone which advances through a fragmented permeable mass of particles in an in situ oil shale retort in a subterranean formation containing oil shale. The apparatus, which functions by releasing means for providing an indicator at a preselected temperature, comprises container means, means for providing an indicator in the container, and means for releasing the indicator providing means at a selected temperature greater than ambient.