Patents by Inventor Luigi Pelosini

Luigi Pelosini 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).

  • Polycondensation catalyzers for the synthesis of polyethylene terephtalate
    Patent number: 5905136
    Abstract: The subject is a class of catalyzers to be used in the stage of polycondensation of the synthesis of poly(ethylene terephtalate), consisting of metal and non-metal derivatives in composition with sulfonic acids mixed with titanium compounds so that the final polymer contains a sulfur quantity of 5-60 ppm and a quantity of metals between 2 and 100 ppm.
    Type: Grant
    Filed: June 19, 1997
    Date of Patent: May 18, 1999
    Assignees: Montefibre S.p.A., Inca International S.p.A.
    Inventors: Riccardo Po, Luigi Pelosini
  • High activity catalytic system for the synthesis of poly(ethylene terephthalate)
    Patent number: 5644019
    Abstract: In the present invention, a class of catalysts is described, to be used in the polycondensation stage in the synthesis of poly(ethylene terephthalate), constituted by a composition of metal derivatives in quantity so that the content of these in the final polymer is below 130 ppm.
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: July 1, 1997
    Assignee: Enichem S.p.A.
    Inventors: Riccardo Po', Luigi Pelosini, Ernesto Occhiello, Luisa Fiocca
  • Polyesters showing a high crystallization rate and procedure for their preparation
    Patent number: 5278281
    Abstract: Polyesters with a high crystallization rate synthesized by the polycondensation of terephthalic acid with at least one C.sub.2 -C.sub.4 alkylenic glycol in the presence of 0.1-1.5 mol % of a copolymerizable reagent having the general formula:ROOC--Ar--OOC--Ar'--COO--Ar--COORwhere Ar and Ar'represent aromatic radicals and R represent a halogen, a hydrogen atom or a C.sub.1- C.sub.4 alkyl radical.
    Type: Grant
    Filed: March 12, 1992
    Date of Patent: January 11, 1994
    Assignee: Enichem S.P.A.
    Inventors: Riccardo Po, Ernesto Occhiello, Fabio Garbassi, Luigi Pelosini
  • Low-crystallization-speed polyesters, and process for their preparation
    Patent number: 5266676
    Abstract: Low-crystallization-speed polyesters obtained by means of the polycondensation of 2,6-naphthalene-dicarboxy acid with at least one (C.sub.2 -C.sub.10)-(cyclo)alkylene glycol in the presence of 0.5-50 mol % of a copolymerizable reactant of general formula:ROOC--Ar--OOC--Ar'--COO--Ar--COOR (I)wherein Ar and Ar' stand for aromatic radicals, and R stands for a hydrogen atom or a (C.sub.1 -C.sub.4)-alkyl radical, or the OR group is replaced by a halogen.
    Type: Grant
    Filed: July 15, 1992
    Date of Patent: November 30, 1993
    Assignee: Istituto Guido Donegani S.p.A.
    Inventors: Riccardo Po', Ernesto Occhiello, Fabio Garbassi, Luigi Pelosini
  • Process for purifying silicon
    Patent number: 4241037
    Abstract: A process is disclosed for purifying silicon wherein silicon in the molten state is reacted with barium carbonate and/or oxide and/or hydroxide and then, after cooling and crushing, leached with one or more dilute inorganic acids. Preferably an oxidizing gas such as oxygen or water vapor is blown into the molten mass during the reaction, which is conducted at a temperature in the range of from 1550.degree. to 2000.degree. C. The inorganic acid may be for example hydrochloric acid, hydrofluoric acid, nitric acid, sulphuric acid, or mixtures thereof.
    Type: Grant
    Filed: November 6, 1979
    Date of Patent: December 23, 1980
    Assignee: Montedison S.p.A.
    Inventors: Luigi Pelosini, Alessandro Parisi, Sergio Pizzini