Patents by Inventor Enzo Rosati

Enzo Rosati 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 preparing diazonium salts of 3-amino-pyrazole
    Patent number: 4268436
    Abstract: 3-Diazonium salts of pyrazole, useful as intermediates in the preparation of azo dyes are obtained by an oxidative diazotization of 3-amino-pyrazolines with nitrous acid or with nitrosyl-sulphuric acid. The 3-diazonium salts of pyrazole have the following structure: ##STR1## wherein: X is a radical --CO-- or --COO--,n is 0 or 1,R is hydrogen (in such case n is always 0), a normal or ramified alkyl C.sub.1 --C.sub.4, an aromatic or heterocyclic, optionally substituted, radical, in particular a phenyl radical having the structure: ##STR2## in which m may vary from 0 to 3 and substituents R.sub.3, either like or unlike one another for m>1, are alkyls C.sub.1 --C.sub.4 with linear or ramified chain, halogens, a cyano, nitro, sulphonic or carboxylic group, carboxyesters having a linear or ramified chain C.sub.1 --C.sub.4, alkoxyls having a linear or ramified chain C.sub.1 --C.sub.4, trifluoro-methyl groups, acylamino groups having a linear or ramified aliphatic chain C.sub.1 --C.sub.
    Type: Grant
    Filed: May 23, 1979
    Date of Patent: May 19, 1981
    Assignee: Aziende Colori Nazionali Affini Acna S.p.A.
    Inventors: Giampiero Pieri, Enzo Rosati, Ruggero Battisti, Giovanni Burei
  • Monoazo-dyes particularly suited to the levelled dyeing of synthetic polyamide fibers
    Patent number: 4153599
    Abstract: Novel monoazo dyes (sparingly soluble in water) which are free of sulphonic groups and which contain an aliphatic-carboxylic chain directly bound to the aryl nucleus of the coupling compound are particularly useful in uniformly dyeing polyamide fibers and/or fabrics yellow to orange-yellow.
    Type: Grant
    Filed: September 30, 1977
    Date of Patent: May 8, 1979
    Assignee: Aziende Colori Nazionali Affini -ACNA S.p.A.
    Inventor: Enzo Rosati
  • Monoazo-dyes particularly suited to the levelled dyeing of synthetic polyamide fibers
    Patent number: 4077765
    Abstract: Novel monoazo dyes (sparingly soluble in water) which are free of sulphonic groups and which contain an aliphatic-carboxylic chain directly bound to the aryl nucleus of the coupling compound are particularly useful in uniformly dyeing polyamide fibers and/or fabrics yellow to orange-yellow.
    Type: Grant
    Filed: August 2, 1976
    Date of Patent: March 7, 1978
    Assignee: Aziende Colori Nazionali Affini-ACNA S.p.A.
    Inventor: Enzo Rosati