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:
Dec. 29, 1981
Filed:
Jun. 20, 1980
Applicant:
Inventor:
Wilfred C Meyer, Midland, MI (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B03D / ;
U.S. Cl.
CPC ...
209166 ;
Abstract
Aromatic polycyclic, hydrocarbon compounds bearing at least one nuclear sulfonic acid or sulfonate moiety are useful as froth promoters to improve the recovery of clean coal in the froth flotation of finely-divided coal. Disulfonated diphenyl ether compounds bearing at least one nuclear alkyl group of from 10 to 22 carbon atoms are particularly efficacious.