Patents by Inventor Joseph N Christopher

Joseph N Christopher 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).

  • Cationic group 3 catalyst system
    Patent number: 6984722
    Abstract: A cationic Group 3 or Lanthanide metal complex for coordination polymerization of olefins is disclosed. The precursor metal complex is stabilized by a monoanionic bidentate ancillary ligand and two monoanionic ligands. The ancillary ligand and the transition metal form a metallocycle having at least five primary atoms, counting any ?-bound cyclopentadienyl group in the metallocycle as two primary atoms. Olefin polymerization is exemplified.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: January 10, 2006
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Joseph N Christopher, Kevin R. Squire, Jo Ann M. Canich, Timothy D. Shaffer
  • Cationic group 3 catalyst system
    Patent number: 6677441
    Abstract: A cationic Group 3 or Lanthanide metal complex for coordination polymerization of olefins is disclosed. The precursor metal complex is stabilized by a monoanionic bidentate ancillary ligand and two monoanionic ligands. The ancillary ligand and the transition metal form a metallocycle having at least five primary atoms, counting any &pgr;-bound cyclopentadienyl group in the metallocycle as two primary atoms. Olefin polymerization is exemplified.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: January 13, 2004
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Joseph N Christopher, Kevin R. Squire, Jo Ann M. Canich, Timothy D. Shaffer
  • Purification of an organometallic compound
    Patent number: 6482968
    Abstract: Organometallic compounds, as exemplified by trimethylaluminum, can be purified by recrystallization from a solvent by cooling. The organometallic compound is first dissolved in a solvent forming a solution and the purified organometallic compound is then recrystallized, under cooling conditions, from the solvent.
    Type: Grant
    Filed: February 7, 2002
    Date of Patent: November 19, 2002
    Assignee: Akzo Nobel NV
    Inventors: Nam H. Tran, Joseph N. Christopher, Timothy J. Michalec
  • Cationic group 3 catalyst system
    Patent number: 6403773
    Abstract: A cationic Group 3 or Lanthanide metal complex for coordination polymerization of olefins is disclosed. The precursor metal complex is stabilized by a monoanionic bidentate ancillary ligand and two monoanionic ligands. The ancillary ligand and the transition metal form a metallocycle having at least five primary atoms, counting any &pgr;-bound cyclopentadienyl group in the metallocycle as two primary atoms. Olefin polymerization is exemplified.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: June 11, 2002
    Assignee: Exxon Mobil Chemical Patents Inc.
    Inventors: Joseph N Christopher, Kevin R. Squire, Jo Ann M. Canich, Timothy D. Shaffer
  • Cationic group 3 catalyst system
    Publication number: 20020065191
    Abstract: A cationic Group 3 or Lanthanide metal complex for coordination polymerization of olefins is disclosed. The precursor metal complex is stabilized by a monoanionic bidentate ancillary ligand and two monoanionic ligands. The ancillary ligand and the transition metal form a metallocycle having at least five primary atoms, counting any &pgr;-bound cyclopentadienyl group in the metallocycle as two primary atoms. Olefin polymerization is exemplified.
    Type: Application
    Filed: November 29, 2001
    Publication date: May 30, 2002
    Inventors: Joseph N. Christopher, Kevin R. Squire, Jo Ann M. Canich, Timothy D. Shaffer
  • Cationic Group 3 catalyst system
    Publication number: 20020058585
    Abstract: A cationic Group 3 or Lanthanide metal complex for coordination polymerization of olefins is disclosed. The precursor metal complex is stabilized by a monoanionic bidentate ancillary ligand and two monoanionic ligands. The ancillary ligand and the transition metal form a metallocycle having at least five primary atoms, counting any &pgr;-bound cyclopentadienyl group in the metallocycle as two primary atoms. Olefin polymerization is exemplified.
    Type: Application
    Filed: November 29, 2001
    Publication date: May 16, 2002
    Inventors: Joseph N. Christopher, Kevin R. Squire, Jo Ann M. Canich, Timothy D. Shaffer