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:
Nov. 06, 1990
Filed:
Jan. 10, 1990
Applicant:
Inventors:
Hans-Joachim Morawietz, Kelkheim, DE;
Werner Ritschel, Konigstein/Taunas, DE;
Kurt Bauer, Kelsterbach, DE;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B03D / ; B03D / ;
U.S. Cl.
CPC ...
209166 ; 252 61 ; 209902 ;
Abstract
A process for selective flotation of phosphate minerals, wherein a compound of the formula 1a or 1b ##STR1## in which R.sup.1 is branched or unbranched C.sub.8 -C.sub.24 -alkenyl, R.sup.2 is branched or unbranched C.sub.1 -C.sub.4 -alkyl and M is hydrogen, ammonium, triethanolammonium, an alkali metal atom or an alkaline earth metal atom, is added as a collecting agent to the flotation suspension.