Patents by Inventor Larry I. Flowers

Larry I. Flowers 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).

  • Method for making polycarbonates
    Patent number: 5804525
    Abstract: A composition and method is provided for making polycarbonate utilizing an effective amount of a binary catalyst system, comprising a phase transfer catalyst and a tertiary organic amine, as a condensation catalyst during the interfacial phosgenation of a bisphenol, such as bisphenol A. for improved phosgene utiliziation.
    Type: Grant
    Filed: February 8, 1996
    Date of Patent: September 8, 1998
    Assignee: General Electric Company
    Inventors: Eugene P. Boden, Larry I. Flowers, Roy R. Odle, Peter D. Phelps, David L. Ramsey, Paul D. Sybert
  • Catalyst system for polycarbonate manufacture
    Patent number: 5744416
    Abstract: A method is provided for making polycarbonates utilizing an effective amount of a binary phase transfer catalyst, such as tetrabutylammonium bromide and a methyl tertiary amine as a condensation catalyst during the interfacial phosgenation of a bisphenol, such as bisphenol A. Improved phosgene utilization is achieved.
    Type: Grant
    Filed: February 8, 1996
    Date of Patent: April 28, 1998
    Assignee: General Electric Company
    Inventors: Larry I. Flowers, Paul D. Sybert, David L. Ramsey
  • Binary phase transfer/amine catalyst for making aromatic polycarbonates
    Patent number: 5739257
    Abstract: A composition and method is provided for making polycarbonate utilizing an effective amount of a binary catalyst system, comprising a phase transfer catalyst selected from the group consisting of methyltributylammonium halide and hexabutylbutylenediammonium halide and a tertiary organic amine, as a condensation catalyst during the interfacial phosgenation of a bisphenol, such as bisphenol A. Improved phosgene utilization and the substantial elimination of emulsion formation in the interfacial polymerization reactor and the processing units downstream thereof results.
    Type: Grant
    Filed: October 21, 1996
    Date of Patent: April 14, 1998
    Assignee: General Electric Company
    Inventors: Eugene P. Boden, Larry I. Flowers, Peter D. Phelps, David L. Ramsey, Paul D. Sybert
  • Complex stabilizer composition to improve the melt stability and color stability of polycarbonates
    Patent number: 5608027
    Abstract: A composition comprising a phosphorus containing acid and an ester of a phosphorus containing acid useful for imparting improved physical and chemical properties to polymers containing polyesters, copolyester carbonates, polycarbonates, and mixtures thereof, a method of treating said polymers with said composition, and articles of manufacture comprising said polymers and said composition.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: March 4, 1997
    Assignee: General Electric Company
    Inventors: Richard Crosby, James L. DeRudder, Larry I. Flowers, Ye-Gang Lin, Roy R. Odle
  • Method for making polycarbonates
    Patent number: 5519105
    Abstract: A composition and method is provided for making polycarbonate utilizing an effective amount of a binary catalyst system, comprising a phase transfer catalyst and a tertiary organic amine, as a condensation catalyst during the interfacial phosgenation of a bisphenol, such as bisphenol A. for improved phosgene utilization.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: May 21, 1996
    Assignee: General Electric Company
    Inventors: Eugene P. Boden, Larry I. Flowers, Roy R. Odle, Peter D. Phelps, David L. Ramsey, Paul D. Sybert
  • Catalyst system for polycarbonate manufacture
    Patent number: 5510449
    Abstract: A method is provided for making polycarbonates utilizing an effective amount of a binary phase transfer catalyst, such as tetrabutylammonium bromide and a methyl tertiary amine as a condensation catalyst during the interfacial phosgenation of a bisphenol, such as bisphenol A. Improved phosgene utilization is achieved.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: April 23, 1996
    Assignee: General Electric Company
    Inventors: Larry I. Flowers, Paul D. Sybert, David L. Ramsey
  • Method for making aromatic polycarbonates
    Patent number: 5391692
    Abstract: A method is provided for making polycarbonate utilizing an effective amount of a phase transfer catalyst, such as tetrabutylammonium bromide as a condensation catalyst during the interfacial phosgenation of a bisphenol, such as bisphenol A. Improved phosgene utilization is achieved.
    Type: Grant
    Filed: February 2, 1994
    Date of Patent: February 21, 1995
    Assignee: General Electric Company
    Inventors: Eugene P. Boden, Peter D. Phelps, David L. Ramsey, Paul D. Sybert, Larry I. Flowers, Roy R. Odle
  • Co-production of an aromatic monoamine and an aromatic diamine directly from benzene or a benzene derivative through controlled nitration
    Patent number: 4740621
    Abstract: A two-stage process for the co-production of aniline and m-phenylenediamine where, in the first stage, benzene, nitric acid, and sulfuric acid are reacted in a liquid phase to produce in greater amounts nitrobenzene (approximately 70%) and m-dinitrobenzene (approximately 30%), and in lesser or trace amounts o-dinitrobenzene and p-dinitrobenzene, and water; and in the second stage the products of the first stage are reacted with hydrogen in the gas phase to produce aniline (approximately 70%) and m-phenylenediamine (approximately 30%) in greater amounts, and o-phenylenediamine and p-phenylenediamine in lesser amounts, and water. The reaction products are separated by distillation.
    Type: Grant
    Filed: November 1, 1985
    Date of Patent: April 26, 1988
    Assignee: First Chemical Corporation
    Inventors: Earl G. Adams, Robert B. Barker, Mark J. Lossett, Larry I. Flowers