Patents by Inventor Robert B. Todd

Robert B. Todd 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: 4192841
    Abstract: A process for producing a pigment or dyestuff composition in the form of dustless readily-dispersible granules which comprises contacting, with agitation, an aqueous dispersion of a pigment, and an aniline which is liquid at temperature below 100.degree. C., insoluble in water at pH values above 7, and soluble in water at pH values below 7, the pH value being first above 7, maintaining the temperature above the melting point of the aniline and reducing the pH to below 7 to render the aniline compound soluble in water, and recovering the resulting granules in a solvent free condition.
    Type: Grant
    Filed: March 24, 1978
    Date of Patent: March 11, 1980
    Assignee: Ciba-Geigy Corporation
    Inventors: George H. Robertson, Robert L. Rooney, Robert B. Todd
  • Patent number: 4170487
    Abstract: A process for producing a pigment or dyestuff composition in the form of dustless readily-dispersible granules which comprises contacting, with agitation, an aqueous dispersion of a pigment, a protective colloid, an aliphatic or araliphatic amine which is liquid at temperatures below 100.degree. C., insoluble in water at pH values above 7, and soluble in water at pH values below 7, and an organic carrier, the pH value being first above 7, maintaining the temperature above the melting point of the amine compound, and reducing the pH to below 7 to render the amine compound soluble in water, and recovering the resulting granules.
    Type: Grant
    Filed: March 24, 1978
    Date of Patent: October 9, 1979
    Assignee: Ciba-Geigy Corporation
    Inventors: George H. Robertson, Robert L. Rooney, Robert B. Todd
  • Patent number: D272560
    Type: Grant
    Filed: October 19, 1981
    Date of Patent: February 7, 1984
    Inventors: Albert V. Pinto, Robert B. Todd, Jr.
  • Patent number: D272561
    Type: Grant
    Filed: October 22, 1981
    Date of Patent: February 7, 1984
    Inventors: Albert V. Pinto, Robert B. Todd, Jr.