Patents by Inventor Jean-Pierre De Rath

Jean-Pierre De Rath 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 preparation of aqueous suspensions containing at least 65% by weight of calcium carbonate
    Patent number: 4242318
    Abstract: Process for the preparation of an aqueous suspension containing at least 65% by weight of calcium carbonate, in which process calcium carbonate is crystallized in a dilute aqueous medium, a wet concentrate of calcium carbonate is separated from the resulting dilute aqueous suspension of calcium carbonate and the said calcium carbonate concentrate is fluidized and homogenized in the presence of a dispersing agent. The calcium carbonate is crystallized in the presence of a water-soluble polyelectrolyte and the calcium carbonate concentrate is separated from the dilute suspension of calcium carbonate by essentially mechanical separating means.
    Type: Grant
    Filed: July 10, 1978
    Date of Patent: December 30, 1980
    Assignee: Solvay & Cie.
    Inventors: Jacques Brahm, Jean-Pierre De Rath