Patents by Inventor Xavier M. Bourrat

Xavier M. Bourrat 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).

  • Solvated mesophase pitches
    Patent number: 5538621
    Abstract: This invention relates to low melting solvated mesophase pitches which are suitable for spinning into carbon fibers. The solvated mesophase pitches have a lower melting point than conventional mesophase pitch but remain substantially anisotropic. The solvated mesophase can be produced as an intermediate during solvent fractionation or supercritical solvent fractionation of mesogen-containing isotropic pitches. The process is enhanced through the ability to recover pseudomesogens with an increased average molecular weight which, in combination with the solvent content, provides a fusible mesophase capable of being spun directly into infusible oriented anisotropic carbon fibers.
    Type: Grant
    Filed: July 28, 1994
    Date of Patent: July 23, 1996
    Assignee: Conoco Inc.
    Inventors: Walter M. Kalback, H. Ernest Romine, Xavier M. Bourrat
  • Solvated mesophase pitches
    Patent number: 5259947
    Abstract: This invention relates to low melting solvated mesophase pitches which are suitable for spinning into carbon fibers. The solvated mesophase pitches have a lower melting point than conventional mesophase pitch but remain substantially anisotropic. The solvated mesophase can be produced as an intermediate during solvent fractionation or supercritical solvent fractionation of mesogen-containing isotropic pitches. The process is enhanced through the ability to recover pseudomesogens with an increased average molecular weight which, in combination with the solvent content, provides a fusible mesophase capable of being spun directly into infusible oriented anisotropic carbon fibers.
    Type: Grant
    Filed: September 19, 1991
    Date of Patent: November 9, 1993
    Assignee: Conoco Inc.
    Inventors: Walter M. Kalback, H. Ernest Romine, Xavier M. Bourrat