Patents by Inventor Douglas George Hamilton

Douglas George Hamilton 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: 7999041
    Abstract: Disclosed herein is a method of preparing a polycarbonate composition comprising melt blending a first polycarbonate prepared by interfacial polymerization and having hydroxy end groups that are capped with endcapping groups, with a second polycarbonate prepared by melt polymerization and having hydroxy end groups that are capped with endcapping groups, wherein the second polycarbonate has a lower mole percent of endcapping groups than that of the first polycarbonate; wherein an article having a thickness of 3.2 mm and molded from the polycarbonate composition has a haze of less than 3 according to ASTM D1003-00; and wherein a flat article molded from the polycarbonate composition has a surface charge of ?2 to +2 kV. A polycarbonate composition and complex article prepared according to the method are also disclosed.
    Type: Grant
    Filed: May 7, 2007
    Date of Patent: August 16, 2011
    Assignee: Sabic Innovative Plastics IP B.V.
    Inventors: Johannes Martinus Dina Goossens, Douglas George Hamilton, Theodorus Lambertus Hoeks
  • Publication number: 20100137500
    Abstract: Disclosed herein is a method of preparing a polycarbonate composition comprising melt blending a first polycarbonate prepared by interfacial polymerization and having hydroxy end groups that are capped with endcapping groups, with a second polycarbonate prepared by melt polymerization and having hydroxy end groups that are capped with endcapping groups, wherein the second polycarbonate has a lower mole percent of endcapping groups than that of the first polycarbonate; wherein an article having a thickness of 3.2 mm and molded from the polycarbonate composition has a haze of less than 3 according to ASTM D1003-00; and wherein a flat article molded from the polycarbonate composition has a surface charge of ?2 to +2 kV. A polycarbonate composition and complex article prepared according to the method are also disclosed.
    Type: Application
    Filed: May 7, 2007
    Publication date: June 3, 2010
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Johannes Martinus Dina Goossens, Douglas George Hamilton, Theodorus Lambertus Hoeks
  • Patent number: 5922816
    Abstract: A polyester-polycarbonate composition comprising (A) at least one polyester prepared by the reaction of at least one alkenediol with at least one dicarboxylic acid or dialkyl ester thereof in the presence of a metallic catalyst, (B) at least one polycarbonate, (C) at least one silyl phosphate, the silyl phosphate being present in an amount effective to inhibit ester-carbonate interchange in the composition, optionally, (D) an organic or inorganic colorant, particularly, acid sensitive organic or inorganic colorants, (E) an impact modifier, and (F) a stabilizer. A method for stabilizing polyester-polycarbonate compositions against ester-carbonate interchange is also provided.
    Type: Grant
    Filed: April 17, 1995
    Date of Patent: July 13, 1999
    Assignee: General Electric Company
    Inventor: Douglas George Hamilton