Patents by Inventor Karl Ronco

Karl Ronco 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).

  • (2,5-diisopropoxycarbonylbenzene-azo-2-hydroxy-3-carbamoyl naphthalene) pigment
    Patent number: 4719293
    Abstract: The invention relates to disazo pigments of the formula ##STR1## wherein R is an ethyl, propyl or isopropyl radical. These pigments colour plastics, especially rigid PVC, in brown shades of excellent fastness properties.
    Type: Grant
    Filed: October 17, 1984
    Date of Patent: January 12, 1988
    Assignee: Ciba-Geigy Corporation
    Inventor: Karl Ronco
  • Disazo pigment from condensation of carboxylic acid chloride with 2,5-dichloro-1,4-phenylene diamine
    Patent number: 4689403
    Abstract: The present invention concerns the disazo pigment of the formula ##STR1## The new pigment is useful for coloring plastic material in pure red shades of high tinctorial strength and outstanding fastness to light and migration.
    Type: Grant
    Filed: April 29, 1982
    Date of Patent: August 25, 1987
    Assignee: Ciba-Geigy AG
    Inventor: Karl Ronco
  • Monoazo pigments containing hydroxynaphthoylamino benzimidazolone radical
    Patent number: 4392999
    Abstract: The instant invention relates to monoazo pigments containing a hydroxynaphthoylaminobenzimidazolone radical which correspond to the formula ##STR1## said new pigments being useful for coloring high molecular materials in orange to brown shades of especially good fastness properties.
    Type: Grant
    Filed: September 14, 1981
    Date of Patent: July 12, 1983
    Assignee: Ciba-Geigy Corporation
    Inventors: Rolf Muller, Armand Roueche, Paul Muller, Karl Ronco
  • Monazo pigments containing hydroxynaphthoylaminobenzimidazalone radical
    Patent number: 4229344
    Abstract: The instant invention relates to monoazo pigments containing a hydroxynaphthoylaminobenzimidazolone radical of the following formula ##STR1## These pigments are useful for coloring high molecular weight materials in orange to brown shades of especially good fastness properties.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: October 21, 1980
    Assignee: Ciba-Geigy Corporation
    Inventors: Rolf Muller, Armand Roueche, Paul Muller, Karl Ronco
  • Aromatic disazo pigments
    Patent number: 4081439
    Abstract: Disazo pigments of the formula ##STR1## WHEREIN X and Y denote hydrogen or halogen atoms, alkyl or alkoxy groups containing 1-6 carbon atoms, or aryloxy, trifluoromethyl, nitro, cyano or carboxylic acid ester groups, or wherein X and Y conjointly denote a fused benzene ring are useful for coloring plastics, lacquers and printing inks in yellow shades.
    Type: Grant
    Filed: August 25, 1976
    Date of Patent: March 28, 1978
    Assignee: Ciba-Geigy Corporation
    Inventors: Stefan Hari, Karl Ronco
  • Dicarboxylic acid ester diazo pigments
    Patent number: 4070353
    Abstract: Diazo pigments of the formula ##STR1## wherein R denotes an alkyl, cycloalkyl, aralkyl, aryl or heterocyclic radical, X denotes a hydrogen or halogen atom, an alkyl or alkoxy group containing 1 to 4 carbon atoms, or a nitro, cyano, trifluoromethyl or carboxylic acid ester group, and Y denotes a hydrogen or halogen atom, an alkyl or alkoxy group containing 1 to 4 carbon atoms or a nitro, cyano, trifluoromethyl or carboxylic acid ester group, are useful for coloring plastics and printing inks in fast yellow to orange shades.
    Type: Grant
    Filed: February 4, 1976
    Date of Patent: January 24, 1978
    Assignee: Ciba-Geigy Corporation
    Inventors: Georg Cseh, Karl Ronco
  • Disazo pigments containing tetracarboxylic acid ester groups
    Patent number: 4051122
    Abstract: Disazo pigments of the formula ##STR1## wherein R represents alkyl containing 1 to 6 carbon atoms, cyclohexyl or phenyl, and X and Y represent hydrogen, halogen, alkyl or alkoxy groups containing 1 to 4 carbon atoms which are useful for pigmenting high molecular organic material.
    Type: Grant
    Filed: September 23, 1975
    Date of Patent: September 27, 1977
    Assignee: Ciba-Geigy Corporation
    Inventor: Karl Ronco