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. 25, 1981
Filed:
Dec. 10, 1979
Applicant:
Inventors:
Leopold van Raam, Amsterdam, NL;
Herman P Ruyter, Amsterdam, NL;
Josefus W van Breugel, Amsterdam, NL;
Assignee:
Shell Oil Company, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F26B / ;
U.S. Cl.
CPC ...
34 15 ; 34 12 ; 34 60 ;
Abstract
Low rank coal is dewatered and upgraded by heating a coal/water mixture at 150.degree. to 300.degree. C. at a pressure preventing water vaporization, mechanically separating the water, then heating the coal at 300.degree. to 400.degree. C. at a pressure allowing water vaporization.