Patents by Inventor Barbara E. McGrath

Barbara E. McGrath 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).

  • Flame retardant organopolysiloxane-polycarbonate graft copolymers
    Patent number: 5039772
    Abstract: Flame retardant graft organopolysiloxane-polycarbonate copolymers are provided which can be made by effecting addition between a silicon-hydride siloxane and an aliphatically unsaturated substituted bisphenol followed by phosgenation of the resulting adduct. Alternatively, direct addition of the silicon-hydride siloxane onto an aliphatically unsaturated substituted polycarbonate backbone also can be effected.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: August 13, 1991
    Assignee: General Electric Company
    Inventors: Gary C. Davis, Barbara E. McGrath, Kevin M. Snow
  • Flame retardant organopolysiloxane-polycarbonate triblock copolymers
    Patent number: 5025074
    Abstract: Phenol-organopolysiloxane chainstoppers are phosgenated in combination with a bisphenol to make flame retardant organopolysiloxane-polycarbonate triblock copolymers. The phenol-organopolysiloxane chainstoppers can be made by effecting addition between an aliphatically unsaturated phenol and a silicon-hydride organopolysiloxane.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: June 18, 1991
    Assignee: General Electric Company
    Inventors: Gary C. Davis, Barbara E. McGrath, Kevin M. Snow