Patents by Inventor David J. Hezzell

David J. Hezzell 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: 5213889
    Abstract: Fibre-reinforced structures comprising a thermoplastics polymer and containing at least 30% by volume of reinforcing filaments extending longitudinally of the structure which have been produced in a continuous process and which have exceptionally high stiffness. The exceptionally high stiffness results from thorough wetting of the reinforcing filaments by molten polymer in the continuous process. The thorough wetting gives rise to a product which can be further processed even in vigorous mixing processes such as injection moulding with surprisingly high retention of the fibre length in the fabricated article. The continuous processes for producing the reinforced structures employ thermoplastics polymers having lower melt viscosities than conventionally considered suitable for achieving satisfactory physical properties.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: May 25, 1993
    Assignee: Imperial Chemical Industries PLC
    Inventors: Frederic N. Cogswell, David J. Hezzell, Peter J. Williams
  • Patent number: 5019450
    Abstract: Fiber-reinforced structures comprising a thermoplastics polymer and containing at least 30% by volume of reinforcing filaments extending longitudinally of the structure which have been produced in a continuous process and which have exceptionally high stiffness. The exceptionally high stiffness results from thorough wetting of the reinforcing filaments by molten polymer in the continuous process. The thorough wetting gives rise to a product which can be further processed even in vigorous mixing processes such as injection moulding with surprisingly high retention of the fiber length in the fabricated article. The continuous processes for producing the reinforced structures employ thermoplastics polymers having lower melt viscosities than conventionally considered suitable for achieving satisfactory physical properties.
    Type: Grant
    Filed: August 30, 1989
    Date of Patent: May 28, 1991
    Assignee: Imperial Chemical Industries PLC
    Inventors: Frederic N. Cogswell, David J. Hezzell, Peter J. Williams
  • Patent number: 4559262
    Abstract: Fibre-reinforced structures comprising a thermoplastics polymer and containing at least 30% by volume of reinforcing filaments extending longitudinally of the structure which have been produced in a continuous process and which have exceptionally high stiffness. The exceptionally high stiffness resluts from thorough wetting of the reinforcing filaments by molten polymer in the continuous process. The thorough wetting gives rise to a product which can be further processed even in vigorous mixing processes such as injection moulding with surprisingly high retention of the fibre length in the fabricated article. The continuous processes for producing the reinforced structures employ thermoplastics polymers having lower melt viscosities than conventionally considered suitable for achieving satisfactory physical properties.
    Type: Grant
    Filed: September 30, 1983
    Date of Patent: December 17, 1985
    Assignee: Imperial Chemical Industries, PLC
    Inventors: Frederic N. Cogswell, David J. Hezzell, Peter J. Williams
  • Patent number: 4549920
    Abstract: Fibre-reinforced structures comprising a thermoplastics polymer and containing at least 30% by volume of reinforcing filaments extending longitudinally of the structure which have been produced in a continuous process and which have exceptionally high stiffness. The exceptionally high stiffness results from thorough wetting of the reinforcing filaments by molten polymer in the continuous process. The thorough wetting gives rise to a product which can be further processed even in vigorous mixing processes such as injection moulding with surprisingly high retention of the fibre length in the fabricated article. The continuous processes for producing the reinforced structures employ thermoplastics polymers having lower melt viscosities than conventionally considered suitable for achieving satisfactory physical properties.
    Type: Grant
    Filed: January 20, 1982
    Date of Patent: October 29, 1985
    Assignee: Imperial Chemical Industries, PLC
    Inventors: Frederic N. Cogswell, David J. Hezzell