Patents by Inventor Jenny S. Carswell

Jenny S. Carswell 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).

  • Aggregated composite mineral pigments
    Patent number: 5236989
    Abstract: A process for forming chemically aggregated composite porous bulking pigments for use in paper filling and coating formulations. An aqueous slurry is formed of feed mineral particles selected from one or more members of the group consisting of kaolin, calcium carbonate, titanium dioxide, gypsum, and mica. A high molecular weight carboxyl-containing polymer or copolymer is added to the slurry to flocculate the mineral particles. An excess of calcium ion is added to the flocced slurry to precipitate the calcium salt of the carboxyl-containing polymer in situ on the feed mineral flocs, and thereby form aggregates of feed mineral particles interconnected by the calcium salt and having a bulk, porous, floc structure. Gaseous carbon dioxide is added to the slurry, and reacts with remaining calcium ion to precipitate calcium carbonate onto the polymeric carboxyl calcium salt. This forms additional light scattering voids or pores and strengthens the connections among the flocced feed particles.
    Type: Grant
    Filed: August 29, 1991
    Date of Patent: August 17, 1993
    Assignee: ECC International Inc.
    Inventors: Alan J. Brown, Dickey S. Shurling, Jr., Jenny S. Carswell
  • Aggregated composite mineral pigments
    Patent number: 5082887
    Abstract: A process for forming chemically aggregated composite porous bulking pigments for use in paper filling and coating formulations. An aqueous slurry is formed of feed mineral particles selected from one or more members of the group consisting of kaolin, calcium carbonate, titanium dioxide, gypsum, and mica. A high molecular weight carboxyl-containing polymer or copolymer is added to the slurry to flocculate the mineral particles. An excess of calcium ion is added to the flocced slurry to precipitate the calcium salt of the carboxyl-containing polymer in situ on the feed mineral flocs, and thereby form aggregates of feed mineral particles interconnected by the calcium salt and having a bulk, porous, floc structure. Gaseous carbon dioxide is added to the slurry, and reacts with remaining calcium ion to precipitate calcium carbonate onto the polymeric carboxyl calcium salt. This forms additional light scattering voids or pores and strengthens the connections among the flocced feed particles.
    Type: Grant
    Filed: November 7, 1990
    Date of Patent: January 21, 1992
    Assignee: ECC American Inc.
    Inventors: Alan J. Brown, Dickey S. Shurling, Jr., Jenny S. Carswell