Patents by Inventor Giampiero Pieri

Giampiero Pieri 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
  • Acid dyes useful for dyeing streaked nylon
    Patent number: 4062645
    Abstract: The known compounds of the formula: ##STR1## wherein X is hydrogen or bromine, Y is hydrogen, chlorine, bromine or methyl and the -COOH group is meta or para to the azo group have been found to be useful in uniformly dyeing polyamide fibers to a yellow shade.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: December 13, 1977
    Assignee: Montedison S.p.A.
    Inventors: Roberto Cipolli, Giampiero Pieri, Camillo Paffoni
  • Fluorescent benzanthronic dyes
    Patent number: 4036733
    Abstract: A plastosoluble fluorescent organic dye is disclosed that is derived from benzanthrone, and having the general formula: ##STR1## wherein X = --H or --Br; and Y = --H, --OCH.sub.3 or --OC.sub.2 H.sub.5. A process for the preparation of a dye of the general formula (I) is also disclosed. These dyes are useful in the bulk dyeing of polystyrene, polymethylmethacrylate, rigid PVC, polyethylene, acrylonitrile/butadiene/styrene copolymers, polycarbonates or mineral oils.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: July 19, 1977
    Assignee: Montedison Fibre S.p.A.
    Inventors: Filippo Maria Carlini, Giampiero Pieri, Camillo Paffoni, Gioacchino Boffa
  • Fluorescent azabenzanthronic dyes
    Patent number: 4031096
    Abstract: A fluorescent azabenzanthronic dye is disclosed having the general formula (I): ##STR1## wherein X = --NH-- or --S--; and Y = --OCH.sub.3 or --OC.sub.2 H.sub.5. A process for the preparation of a dye of the general formula (I) is also disclosed. These dyes are useful in the bulk dyeing of polystyrene, polymethylmethacrylate, rigid PVC, polyethylene, acrylonitrile/butadiene/styrene copolymers, polycarbonates or mineral oils.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: June 21, 1977
    Assignee: Montedison S.p.A.
    Inventors: Giampiero Pieri, Filippo Maria Carlini, Camillo Paffoni, Gioacchino Boffa