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:
Oct. 17, 1978
Filed:
Jan. 21, 1977
Applicant:
Inventors:
James K Kindig, Arvada, CO (US);
Ronald L Turner, Golden, CO (US);
Assignee:
Hazen Research, Inc., Golden, CO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C10L / ; C10B / ;
U.S. Cl.
CPC ...
44 / ; 201 17 ;
Abstract
In a process for improving coal wherein the raw coal is treated with a metal containing compound in order to enhance the magnetic susceptibility of certain impurity components contained in the raw coal permitting their removal by magnetic separation, the improvement comprising pretreating the coal by heating it to at least a temperature for at least a period of time sufficient to essentially meet or exceed a time and temperature relationship expressed as: