Patents by Inventor Elun S. Madsen

Elun S. Madsen 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 an organic pigment dispersion
    Patent number: 4765841
    Abstract: An organic pigment dispersion in a non-aqueous medium is prepared directly from an aqueous slurry containing 0.1-20% by weight of the pigment by mixing the aqueous slurry with the non-aqueous medium under vigorous agitation and subsequently isolating the organic pigment dispersion from the residual aqueous phase.A substantial part of water in the resulting pigment dispersion can be removed by passing the organic pigment dispersion in the non-aqueous medium over a series of surfaces, the surface material thereof having different affinity for water and the non-aqueous medium, respectively, and then removing water and pigment dispersion in the non-aqueous medium, respectively, from respective surfaces.
    Type: Grant
    Filed: October 9, 1986
    Date of Patent: August 23, 1988
    Assignee: Kemisk Vaerk Koge A/S
    Inventors: Arne Vinther, Steffen C. Olsen, Bjorn E. H. Larsen, Elun S. Madsen, Bjorn Madsen