Patents by Inventor Anca Dumitrescu

Anca Dumitrescu 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).

  • Catalytic lactide and glycolide (co)polymerization system
    Patent number: 7999061
    Abstract: A catalytic lactide and glycolide copolymerization system comprising a trifluoromethane sulfonate as a catalyst and copolymerization additive and a copolymerization process.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: August 16, 2011
    Assignee: IPSEN Pharma S.A.S.
    Inventors: Blanca Martin-Vaca, Anca Dumitrescu, Lidija Vranicar, Jean-Bernard Cazaux, Didier Bourissou, Roland Cherif-Cheikh, Frédéric Lacombe
  • Catalytic lactide and glycolide (co)polymerization system
    Publication number: 20090171066
    Abstract: A catalytic lactide and glycolide copolymerization system comprising a trifluoromethane sulfonate as a catalyst and copolymerization additive and a copolymerization process.
    Type: Application
    Filed: December 11, 2008
    Publication date: July 2, 2009
    Inventors: Blanca Martin-Vaca, Anca Dumitrescu, Lidija Vranicar, Jean-Bernard Cazaux, Didier Bourissou, Roland Cherif-Cheikh, Frederic Lacombe
  • Use of zinc derivatives as cyclic ester polymerization catalysts
    Patent number: 7169729
    Abstract: The invention concerns the use of zinc derivatives of general formula (I) wherein: L1 represents a group of formula: —E14(R14)(R?14)(R?14), —E15(R15) (R?15) or —E16(R16); E is an atom of group 15; L2 and L3 independently represent a group of formula: —E14(R14)(R?14)(R?14), —E15(R15)(R?15) or —E16(R16), or together form a chain of formula —L?2—A—L?3—; A represents a saturated or unsaturated chain comprising one, two or three elements of group 14; L?2 and L?3 independently represent a group of formula —E14(R14)(R?14) —E15(R15) or —E16—; E14 is an element of group 14; E15 is an element of group 15; E16 is an element of group 16; R14, R?14, R?14, R15, R?15 and R16 represent various groups, as (co) polymerisation catalysts of cyclic esters
    Type: Grant
    Filed: April 9, 2002
    Date of Patent: January 30, 2007
    Assignees: Societe de Conseils de Recherches et d'Applications Scientifiques (S.C.R.A.S.), Centre National de la Recherche Scientifique (C.N.R.S.)
    Inventors: Anca Dumitrescu, Martin-Vaca Blanca, Heinz Gornitzka, Didier Bourissou, Jean-Bernard Cazaux, Guy Bertrand
  • Polymerization catalysts
    Patent number: 7101959
    Abstract: A subject of the present invention is new compounds having a lanthanide and having a tridentate ligand, a process for their preparation and their use in particular as polymerization catalysts.
    Type: Grant
    Filed: January 20, 2004
    Date of Patent: September 5, 2006
    Assignees: Societe de Conseils de Recherches et d'Applications Scientifiques (S.C.R.A.S.), Centre National de la Recherche Scientifique (C.N.R.S.)
    Inventors: Anca Dumitrescu, Heinz Gornitzka, Blanca Martin-Vaca, Didier Bourissou, Guy Bertrand, Jean-Bernard Cazaux
  • Use of stannylenes and germylenes as polymerization catalysts for heterocycles
    Patent number: 7084237
    Abstract: The use of stannylenes and germylenes of general formula (I) wherein: M represents a tin or geranium atom; L1 and L2 independently represent a group of formula: -E14(R14) (R?14) (R?14), -E15(R15) (R?15) or -E16(R16)) or together form a chain of formula -L?1-A- L?2; A represents a saturated or unsaturated chain comprising one, two or three elements of group 14; L?1 and L?2, represent, independently, a group of formula: -E14(R14) (R?14)-, E15(R15)- or -E16-; E14 is an element of group 14; E15 is an element of group 15; E16 is an element of group 16; R14, R?14, R?14, R15, R?15 and R16 represent variable groups as polymerization catalysts of heterocycles.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: August 1, 2006
    Assignees: Societe de Conseils de Recherches et d'Applications Scientifiques (S.C.R.A.S.), Centre National de la Recherche Scientifique
    Inventors: Anca Dumitrescu, Heinz Gornitzka, Blanca Martin-Vaca, Didier Bourissou, Guy Bertrand, Jean-Bernard Cazaux
  • Lactide and glycolide(co)polymerization catalytic system
    Publication number: 20060149030
    Abstract: A catalytic lactide and glycolide copolymerization system comprising a trifluoromethane sulfonate as a catalyst and copolymerization additive and a copolymerization process.
    Type: Application
    Filed: January 19, 2004
    Publication date: July 6, 2006
    Inventors: Blanca Martin-Vaca, Anca Dumitrescu, Lidija Vranicar, Jean-Bernard Cazaux, Didier Bourissou, Roland Cherif-Cheikh, Frederic Lacombe
  • Polymerisation catalysts
    Publication number: 20040209768
    Abstract: A subject of the present invention is new compounds having a lanthanide and having a tridentate ligand, a process for their preparation and their use in particular as polymerization catalysts.
    Type: Application
    Filed: January 20, 2004
    Publication date: October 21, 2004
    Inventors: Anca Dumitrescu, Heinz Gornitzka, Blanca Martin-Vaca, Didier Bourissou, Guy Bertrand, Jean-Bernard Cazaux
  • Use of zinc derivatives as cyclic ester polymerization catalysts
    Publication number: 20040110912
    Abstract: The invention concerns the use of zinc derivatives of general formula (I) wherein: L1 represents a group of formula: —E14(R′14)(R″14), —E15(R15)(R′15) or —E16(R16); E is an atom of group 15; L2 and L3 independently represent a group of formula: —E14(R14)(R′14)(R″14), —E15(R15)(R′15) or —E16(R16), or together form a chain of formula —L′2—A—L′3—; A represents a saturated or unsaturated chain comprising one, two or three elements of group 14; L′2 and L′3 independently represent a group of formula —E14(R14)(R′14) —E15(R15) or —E16—; E14 is an element of group 14; E15 is an element of group 15; E16 is an element of group 16; R14, R′14, R″1, R15, R′15 and R16 represent various groups, as (co) polymerisation catalysts of cyclic esters.
    Type: Application
    Filed: November 3, 2003
    Publication date: June 10, 2004
    Inventors: Anca Dumitrescu, Martin-Vaca Blanca, Heinz Gornitzka, Didier Bourissou, Jean-Bernard Cazaux, Guy Bertrand
  • Polymerisation catalyst
    Patent number: 6716787
    Abstract: A subject of the present invention is new compounds having a lanthanide and having a tridentate ligand, a process for their preparation and their use in particular as polymerization catalysts.
    Type: Grant
    Filed: December 18, 2001
    Date of Patent: April 6, 2004
    Assignees: Societe de Conseils de Recherches et d'Applications Scientifiques (S.C.R.A.S.), Centre National de la Recherche Scientifique (C.N.R.S.)
    Inventors: Anca Dumitrescu, Heinz Gornitzka, Blanca Martin-Vaca, Didier Bourissou, Guy Bertrand, Jean-Bernard Cazaux
  • Use of stannylenes and germylenes as polymerisation catalysts for heterocycles
    Publication number: 20030153717
    Abstract: The invention concerns the use of stannylenes and germylenes of general formula (1) wherein: 1
    Type: Application
    Filed: November 7, 2002
    Publication date: August 14, 2003
    Inventors: Anca Dumitrescu, Heinz Gornitzka, Blanca Martin-Vaca, Didier Bourissou, Guy Bertrand, Jean-Bernard Cazaux