Patents by Inventor Nicholas A. Ambrosiano

Nicholas A. Ambrosiano 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 purification of quinoline yellow
    Patent number: 4398916
    Abstract: A multi-step process for the purification of Quinoline Yellow WS involves generating water-insoluble organic amine salts of sulfonated 2-(2-quinolinyl)-1,3-indandione from technical Quinoline Yellow WS followed by treatment of the amine salt with sodium hydroxide to regenerate Quinoline Yellow WS certifiable as a D&C color.
    Type: Grant
    Filed: October 28, 1981
    Date of Patent: August 16, 1983
    Assignee: Sterling Drug Inc.
    Inventors: Nicholas A. Ambrosiano, James E. Kassner
  • Polyaminomethylated monoazo and disazo colorants
    Patent number: 4143034
    Abstract: Novel mixtures, which consist essentially of a monoazo compound selected from the group of 1-phenylazo-2-hydroxynaphthalenes or of a disazo compound selected from the group of various bis-phenyl and bridged bis-phenyl diamines diazotized and coupled to .beta.-naphthols, acetoacetanilides or 1-phenyl-3-methyl-5-pyrazolones and N,N'-bis(4-phenylazo-3-hydroxy-2-naphthocarbonyl)diaminoethanes multiply and randomly substituted with an average of one to eight aminomethyl groups per molecule or the acid-addition salts thereof, obtained by polyaminomethylating monoazo or disazo compounds, are useful for coloring natural fibers, synthetic fiber-forming material and cellulosic materials as well as in the manufacture of paper, varnishes, inks, coatings and plastics.
    Type: Grant
    Filed: March 9, 1977
    Date of Patent: March 6, 1979
    Assignee: Sterling Drug Inc.
    Inventors: Patrick J. Jefferies, Nicholas A. Ambrosiano
  • Polycyclic iminoisoindoline chelates
    Patent number: 4122261
    Abstract: This invention relates to novel compounds of the isoindolenine series. More particularly, the present invention relates to certain novel 1-imino-3-(4-imino-5-thiazolidinylidene)isoindolines, 1-imino-3-(4-imino-2-thiazolin-5-ylidene)isoindolines, water-insoluble pigments prepared therefrom, and to methods for their preparation.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: October 24, 1978
    Assignee: Sterling Drug Inc.
    Inventors: Nathan N. Crounse, Nicholas A. Ambrosiano
  • 1-Imino-3-(4-imino-5-thiazolidinylidene)isoindolines
    Patent number: 4066653
    Abstract: This invention relates to novel compounds of the isoindolenine series. More particularly, the present invention relates to certain novel 1-imono-3-(4-imino-5-thiazolidinylidene)isoindolines, 1-imino-3-(4-imino-2-thiazolin-5-ylidene)isoindolines, water-insoluble pigments prepared therefrom, and to methods for their preparation.
    Type: Grant
    Filed: June 1, 1976
    Date of Patent: January 3, 1978
    Assignee: Sterling Drug Inc.
    Inventors: Nathan N. Crounse, Nicholas A. Ambrosiano
  • Metal chelates of 1-imino-3-(4-thioxo-5-thiazolidinylidene)isoindolines
    Patent number: 4028372
    Abstract: This invention relates to novel compounds of the isoindoline series. More particularly, the present invention relates to certain novel 1-imino-3-(2-oxo-4-thioxo-5-thiazolidinylidene)isoindolines, 1-imino-3-(2,4-dithioxo-5-thiazolidinylidene)isoindolines, water-insoluble pigments prepared therefrom, and to methods for their preparation.
    Type: Grant
    Filed: November 19, 1975
    Date of Patent: June 7, 1977
    Assignee: Sterling Drug Inc.
    Inventors: Nathan N. Crounse, Nicholas A. Ambrosiano
  • Thiazolidinylidene-isoindolines
    Patent number: 3993658
    Abstract: This invention relates to novel compounds of the isoindolenine series. More particularly, the present invention relates to certain novel 1-imino-3-(4-imino-5-thiazolidinylidene)isoindolines, 1-imino-3-(4-imino-2-thiazolin-5-ylidene)isoindolines, water-insoluble pigments prepared therefrom, and to methods for their preparation.
    Type: Grant
    Filed: April 3, 1975
    Date of Patent: November 23, 1976
    Assignee: Sterling Drug Inc.
    Inventors: Nathan N. Crounse, Nicholas A. Ambrosiano
  • Thiazolidinylidene isoindoline pigments
    Patent number: 3966753
    Abstract: This invention relates to novel compounds of the isoindoline series. More particularly, the present invention relates to certain novel 1-imino-3-(2-oxo-4-thioxo-5-thiazolidinylidene)isoindolines, 1-imino-3-(2,4-dithioxo-5-thiazolidinylidene)isoindolines, water-insoluble pigments prepared therefrom, and to methods for their preparation.
    Type: Grant
    Filed: August 9, 1974
    Date of Patent: June 29, 1976
    Assignee: Sterling Drug Inc.
    Inventors: Nathan N. Crounse, Nicholas A. Ambrosiano