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. 03, 1993
Filed:
May. 22, 1989
Applicant:
Inventors:
Mahesh C Jha, Arvada, CO (US);
Paul W Woessner, Indianapolis, IN (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ; C09C / ;
U.S. Cl.
CPC ...
423449 ; 423445 ; 201 37 ; 208408 ;
Abstract
Coal is heated between about 95.degree. and 250.degree. C. to evaporate moisture, but not volatile hydrocarbons. The dried coal is heated to a temperature between about 400.degree. and 700.degree. C. to recover volatile hydrocarbons and to form char, the char is treated with hydrogen at a temperature between about 700.degree. and 1000.degree. C. to form methane, and the methane is decomposed to form pure carbon and hydrogen, which is recycled to treat the char.