Patents by Inventor Wim Dorrepaal

Wim Dorrepaal 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).

  • Process for the flotation of ores
    Patent number: 4200522
    Abstract: A process is provided for the flotation of ores, wherein esters of orthophthalic acid or maleic acid with C.sub.8 -C.sub.14 alcohols or oleyl alcohol are used as collectors, together with the usual fatty acid type collectors, thus permitting important savings in the use of this latter component. Particular advantages are so obtained in the flotation of phosphate ore and of magnesium-containing minerals.
    Type: Grant
    Filed: January 18, 1978
    Date of Patent: April 29, 1980
    Assignee: CHEM-Y, Fabriek van chemische produkten B.V.
    Inventors: Wim Dorrepaal, Gerardus M. van den Haak
  • Process for the flotation of ores and collector for use in this process
    Patent number: 4171261
    Abstract: A process is provided for the flotation of ores, wherein compounds of the formula RO-(C.sub.x H.sub.2x O).sub.n CH.sub.2 COOM, wherein R is an aliphatic residue of 8-18 carbon atoms or an alkylaryl residue having 6-12 carbon atoms in the alkyl moiety, n has an average value of 0-10 and x has a value of 2 or 3, and M is a monovalent cation, are used as collectors, together with the usual fatty acid type collectors, these collector mixtures possessing synergistic properties. Also collector mixtures for use in such a process are provided.
    Type: Grant
    Filed: November 8, 1976
    Date of Patent: October 16, 1979
    Assignee: Chem-Y, Fabriek van Chemische Produkten B.V.
    Inventors: Wim Dorrepaal, Gerardus M. VAN DEN Haak, Joseph M. Weehuizen, Johan G. Aalbers
  • Flotation process for fluoride minerals
    Patent number: 4157296
    Abstract: Flotation processes are provided, wherein a vinyl sulfonic acid polymer or an allyl sulfonic acid polymer is added to the pulp in a minor amount as a depressant for constituents which preferably should be floated to a minimum degree. Thus the polymers are effective barite-depressants in the flotation of fluoride minerals and rare earth carbonates. Also the polymers are useful as monazite depressants.
    Type: Grant
    Filed: July 11, 1977
    Date of Patent: June 5, 1979
    Assignee: Chem-Y Fabriek van Chemische Produkten B.V.
    Inventors: Wim Dorrepaal, Gerardus M. Van den Haak