Patents by Inventor Ian A. Macpherson

Ian A. Macpherson 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).

  • Patent number: 4255375
    Abstract: A process for producing a pigment or dyestuff composition in the form of dustless readily dispersible granules, which process comprises contacting, with agitation, an aqueous dispersion of a pigment and a composition comprising one or more organic acids which are liquid at temperatures below 100.degree. C. or their salts, at a pH value at which the acid is insoluble in water, the temperature being maintained during contacting above the melting point of the acid until the pigment has completely transferred into the organic phase; increasing the pH to a value suitable to render the acid soluble in water and recovering the resulting granules.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: March 10, 1981
    Assignee: Ciba-Geigy Corporation
    Inventors: Ian A. Macpherson, John A. Stirling, Ian R. Wheeler, James M. McCrae
  • Patent number: 4143058
    Abstract: A process for the production of a compound of the formula: ##STR1## in pigmentary form having a mean particle size not exceeding 0.3 microns, comprising:(a) reacting .beta.-naphthol with chloroform in an alkaline medium, using a sufficiently slow rate of addition of chloroform that the reaction mixture, after initially assuming a deep blue color and then turning green, maintains this green coloration until the addition of chloroform has been completed;(b) reacting the alkali metal salt of 2-hydroxy-1-naphthaldehyde from step (a) with 2-aminophenol to produce a ligand of formula: ##STR2## (c) metallizing the ligand of formula II with an aqueous solution of a coppering agent, and isolating the complex metal pigment of formula I.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: March 6, 1979
    Assignee: Ciba-Geigy Corporation
    Inventors: James M. McCrae, Alexander M. Irvine, Ian A. Macpherson, Vincent J. Cavalieri