Patents by Inventor Sisto S. Papa

Sisto S. Papa 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).

  • Concentrated coloring solutions of a blue tinge based on mixture of 1.4-dialkyl-anthraquinones for the coloring of petroliferous products
    Patent number: 4303407
    Abstract: The present invention relates to concentrated solutions in organic solvents of special mixtures of 1-4-dialkyl-amino-anthraquinone dyes particularly useful for the coloring of hydrocarbons. The solutions of this invention are particularly useful for the coloring of hydrocarbons obtained by distillation of crude oil such, for example, as petrol kerosene and gas oil. The invention also includes the preparation of the aforementioned concentrated solutions, including direct preparation of the solutions during the synthesis phase of the anthraquinone dyes.
    Type: Grant
    Filed: May 21, 1980
    Date of Patent: December 1, 1981
    Assignee: Aziende Colori Nazionali Affini ACNA S.p.A.
    Inventors: Ugo Marangelli, Giancarlo Ciocci, Sisto S. Papa
  • Water-soluble disazo dyestuff derived from 4,4-diaminobenzanilide
    Patent number: 4250091
    Abstract: The sulfonated disazo dyestuff of the formula: ##STR1## is useful in dyeing cotton and other cellulosic fibers.
    Type: Grant
    Filed: May 7, 1979
    Date of Patent: February 10, 1981
    Inventors: Sisto S. Papa, Antonino Condo
  • Symmetrical trisazo dye obtained by coupling tetrazotized 4-4'-diaminozobenzene with 2-carboxymethylamin0-8-naphthol-6-sulphonic acid
    Patent number: 4248776
    Abstract: The present invention concerns a new acid trisazo dye suited for the dyeing of natural and synthetic polyamidic fibres and particularly for the dyeing of leather. The dye has the following structural formula: ##STR1## and dyes in a full black shade. The present invention also includes a process for the preparation of dye (I) and comprises tetrazotizing 4-4' diaminoazobenzene and then coupling the tetrazo-compound thus formed with 2 molecules of 2-carboxymethylamino-8-naphtol-6-sulphonic acid (carboxy methyl-gamma acid) in an alkaline medium.
    Type: Grant
    Filed: April 25, 1979
    Date of Patent: February 3, 1981
    Assignee: Aziende Colori Nazionali Affini Acna S.p.A.
    Inventors: Sisto S. Papa, Renzo Ferrario