Patents by Inventor Jan Coetzee

Jan Coetzee has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Depressants for froth flotation
    Patent number: 4657669
    Abstract: The invention concerns the use of 5-hydroxy-3-thiazolidine-2-thiones of the structure I ##STR1## where R.sub.1 =(CHOH).sub.m, R.sub.2 =(CHOH).sub.n where (m+n)=0 to 6, and R.sub.3 is alkyl or hydroxy-alkyl as depressants in the flotation of mixtures of base metal minerals, particularly those containing molybdenum, copper, lead, zinc; and to flotation processes using these compounds.
    Type: Grant
    Filed: July 19, 1985
    Date of Patent: April 14, 1987
    Assignee: Sentrachem Limited
    Inventors: Peter Shaw, Jan Coetzee