Patents by Inventor Luc E. Leemans

Luc E. Leemans 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).

  • Stabilization of dispersions of metal oxides and/or carbon black in water
    Patent number: 5292591
    Abstract: According to the present invention a dispersant is provided for stabilizing dispersions of metal oxides and/or carbon black in water in the presence of a hydrophilic binder. Said dispersant is a block-copolymer comprising at least one block of an ammonium group containing (meth)acrylate.
    Type: Grant
    Filed: March 9, 1993
    Date of Patent: March 8, 1994
    Assignee: AGFA-Gevaert, N.V.
    Inventors: Philippe J. Teyssie, Luc E. Leemans, Walter A. Verdyck, Nikolaas C. de Jaeger
  • Stabilization of dispersions of metal oxides and/or carbon black in water
    Patent number: 5200456
    Abstract: According to the present invention a dispersant is provided for stabilizing dispersions of metal oxides and/or carbon black in water in the presence of a hydrophilic binder. Said dispersant is a block-copolymer comprising at least one block of an ammonium group containing (meth)acrylate.
    Type: Grant
    Filed: July 9, 1991
    Date of Patent: April 6, 1993
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Philippe J. Teyssie, Luc E. Leemans, Walter A. Verdyck, Nikolaas C. de Jaeger
  • Anionic (co)polymerization using an arylmethide initiator
    Patent number: 4980432
    Abstract: Process for the preparation of polymers by anionic (co)polymerization of ethylenically unsaturated organic monomers in the presence of an arylmethide initiator of the following general structure: ##STR1## wherein: X.sup.+ represents a cation;Y and Z (same or different) represent a hydrogen atom or an alkyl group;Ar represents a condensed aromatic group, including a substituted condensed aromatic group.
    Type: Grant
    Filed: April 11, 1988
    Date of Patent: December 25, 1990
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Herman J. Uytterhoeven, Philippe J. Teyssie, Roger M. Fayt, Luc E. Leemans
  • Polymeric surfactant
    Patent number: 4908155
    Abstract: A surface-active block copolymer which comprises chemically linked polymeric blocks (A) and (B), block (A) of said copolymer consisting of at least one homo- or copolymerized non-polar alpha,beta-ethylenically unsaturated monomer and block (B) of said copolymer is derived by polymerizing an alpha-beta ethylenically unsaturated monomer containing an epoxy group and transforming the epoxy group into an hydroxy-substituted ionic group, preferably an anionic group. These block copolymers are used as dispersing agents in aqueous dispersions, including polymeric latex dispersions, and as plasticizing agent in hydrophilic colloid layers, including colloid layers containing a dispersed light-sensitive silver halide emulsion or other auxiliary substances for photographic materials.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: March 13, 1990
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Luc E. Leemans, Herman J. Uytterhoeven, Philippe J. Teyssie, Roger M. Fayt, Nikolaas C. de Jaeger