Patents by Inventor Denis Tembou Nzudie

Denis Tembou Nzudie 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).

  • Aqueous stable dispersions based on water-soluble polymers containing a cationic dispersant comprising hydrophobic units
    Patent number: 6225395
    Abstract: Water-in-water dispersions based on water-soluble polymers can be prepared using a polymer dispersant containing hydrophobic units. The dispersions of the invention are stable on storage and are of low viscosity.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: May 1, 2001
    Assignee: Elf Atochem, S.A.
    Inventors: Denis Tembou Nzudie, Christian Collette
  • Aqueous saline dispersions of water-soluble polymers containing an amphiphilic dispersant based on a cationic polymer containing hydrophobic units
    Patent number: 6221957
    Abstract: The invention relates to aqueous saline dispersions containing a water-soluble polymer and a dispersant based on a polymer, preferably a cationic polymer, containing hydrophobic units.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: April 24, 2001
    Assignee: Elf Atochem S.A.
    Inventors: Denis Tembou Nzudie, Christian Collette
  • Concentrated aqueous dispersions of water-soluble polymers
    Patent number: 6174950
    Abstract: Concentrated and low viscosity aqueous dispersions, e.g., opaque emulsions, well suited as flocculants for water treatment, comprise the water-soluble polymerizate of at least one water-soluble hydrophilic monomer A, optionally, at least one amphiphilic comonomer B and/or, also optionally, at least one hydrophobic comonomer C, in the presence of at least one polymeric dispersant incompatible therewith, for example an imidized and salified styrene/maleic anhydride copolymer or poly(diallyldimethylammonium chloride).
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: January 16, 2001
    Assignee: Elf Atochem S.A.
    Inventors: Denis Tembou Nzudie, Didier Vanhoye