Patents by Inventor Norberto Gatti

Norberto Gatti 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).

  • Patent number: 5098531
    Abstract: Preparation of 2-aryl-hydroquinones of formula (I) by oxidizing by an electrochemical route a compound of formula (II): ##STR1## wherein A represents an aryl group optionally substituted with groups compatible with the reaction conditions in an acidic aqueous reaction medium, at temperatures within the range of from to C., and with anodes of graphite or PbO.sub.2. The products are used in photography and in the field of liquid-crystal polymers.
    Type: Grant
    Filed: November 28, 1990
    Date of Patent: March 24, 1992
    Assignee: Istituto Guido Donegani S.p.A.
    Inventors: Norberto Gatti, Marco Foa
  • Patent number: 5091066
    Abstract: There is disclosed a process for the preparation of 2-methyl-5-pyrazinoic acid consisting of electrochemically oxidizing a compound having formula: ##STR1## wherein X is --OH, Cl, Br, --O--CO--R, --O--SO.sub.2 --R, in which R is a C.sub.1 -C.sub.5 alkyl radical, optionally substituted with F or Cl, or it is a C.sub.6 -C.sub.12 aryl radical, in an aqueous alkaline medium, at a temperature ranging from C. to C., using anodes coated with nickel oxide-hydroxide.
    Type: Grant
    Filed: May 29, 1991
    Date of Patent: February 25, 1992
    Assignee: Presidenza del Consiglio dei Ministri
    Inventors: Marco Foa, Fabrizio Forlini, Norberto Gatti, Giampiero Borsotti
  • Patent number: 5043440
    Abstract: Process for preparing compounds according to formula (I) ##STR1## wherein R.sub.1 and R.sub.2 represent a hydrogen atom or a protective group and R.sub.3 represents a C.sub.1 -C.sub.10 alkyl or an aryl group, by oxidation of compounds according to formula (II) ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 have the above-mentioned meanings, in a two-phase system comprising:a) an organic phase including a 4-acylazetidinone compound (II) and an "onium" salt dissolved in a medium immiscible with water,b) an aqueous solution including an alkali or alkaline-earth metal salt of an organic or inorganic peracid.4-Acyloxyazetidinones (I) are useful intermediates in the synthesis of anti-bacterial compounds.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: August 27, 1991
    Assignee: Farmitalia Carlo Erba S.p.A.
    Inventors: Marco Ricci, Maria Altamura, Daniele Bianchi, Walter Cabri, Norberto Gatti
  • Patent number: 4689433
    Abstract: A process for the manufacture of o-nitrobenzaldehyde by oxidation of o-nitrotoluene, characterized in that o-nitrotoluene is made to react with an aqueous solution containing Cerium.sup.iv perchlorate and from 5 to 9 moles/liter of perchloric acid; according to a preferred embodiment, the dispersion of o-nitrotoluene in an aqueous solution containing from 5 to 9 moles per liter of perchloric acid is first prepared and then an aqueous solution is gradually added, containing Cerium.sup.iv perchlorate and 5-9 moles/liter of perchloric acid.
    Type: Grant
    Filed: June 10, 1986
    Date of Patent: August 25, 1987
    Assignee: Montedison S.p.A.
    Inventors: Marco Foa', Norberto Gatti