Patents by Inventor Alan Selwood

Alan Selwood 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: 5910346
    Abstract: Tubular workpieces of oriented polymers such as polyethylene polyester and PVC are formed by drawing a workpiece over an expanding former in the absence of any force perpendicular to the axis of the workpiece. The processes do not require the use of any liquid lubricant. They enable greater degrees of expansion and hence orientation in the direction perpendicular to the axis to be achieved and result in products of improved appearance and strength.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 8, 1999
    Assignee: BTG International Limited
    Inventors: Ian MacMillan Ward, Gordon Craggs, Alan Selwood, Ajay Kumar Taraiya
  • Patent number: 5665297
    Abstract: Tubular workpieces of oriented polymers such as polyethylene polyester and PVC are formed by drawing a workpiece over an expanding former in the absence of any force perpendicular to the axis of the workpiece. The processes do not require the use of any liquid lubricant. They enable greater degrees of expansion and hence orientation in the direction perpendicular to the axis to be achieved and result in products of improved appearance and strength.
    Type: Grant
    Filed: August 24, 1994
    Date of Patent: September 9, 1997
    Assignee: British Technolog Group Limited
    Inventors: Ian MacMillan Ward, Gordon Craggs, Alan Selwood, Ajay Kumar Taraiya
  • Patent number: 5650114
    Abstract: Tubular workpieces of oriented polymers such as polyethylene polyester and PVC are formed by drawing a workpiece over an expanding former in the absence of any force perpendicular to the axis of the workpiece. The processes do not require the use of any liquid lubricant. They enable greater degrees of expansion and hence orientation in the direction perpendicular to the axis to be achieved and result in products of improved appearance and strength.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: July 22, 1997
    Assignee: British Technology Group Limited
    Inventors: Ian MacMillan Ward, Gordon Craggs, Alan Selwood, Ajay Kumar Taraiya
  • Patent number: 4801419
    Abstract: A process for the deformation of a hollow workpiece comprising orientable, thermoplastic polymer by passage in the solid phase through a die having both an entry side and an exit side, which process comprises providing the hollow workpiece at the entry side of the die; applying to the hollow workpiece from the exit side of the die a tension insufficient to cause tensile failure of the workpiece but sufficient to deform the hollow workpiece by drawing it with reduction in its bulk cross-sectional area in the solid phase simultaneously through the die and over an internally positioned former having a cross-sectional area greater than the initial internal cross-sectional area of the hollow workpiece; and collecting the deformed hollow workpiece from the exit side of the die.
    Type: Grant
    Filed: July 15, 1986
    Date of Patent: January 31, 1989
    Assignee: National Research Development Corporation
    Inventors: Ian M. Ward, Alan Selwood
  • Patent number: 4391766
    Abstract: .beta.-Hydroxybutyric acid polymers are extracted from micro-organism cells by contact with a solvent, such as 1,2-dichloroethane which is a poor solvent for the polymer once it has been precipitated.The solution obtained by extraction is caused to gel and then solvent is expelled by subjecting the gel to a deformation process. Expelled solvent is recovered for extraction of polymer from a further quantity of cells.
    Type: Grant
    Filed: February 12, 1982
    Date of Patent: July 5, 1983
    Assignee: Imperial Chemical Industries PLC
    Inventors: Peter J. Barham, Alan Selwood
  • Patent number: 4360488
    Abstract: A process of forming shaped articles comprising forming a free draining gel from a solution of poly(hydroxybutyrate) in a poor solvent under conditions which cause crystallization of the polymer and subjecting the gel to a non-random deformation process so that the associated solvent is expressed. Some residual solvent may be present and can assist in subsequent fabrication processes but the solvent may also be completely removed for such processes. The resulting products have good physical properties, after uniaxial or biaxial drawing.
    Type: Grant
    Filed: August 4, 1980
    Date of Patent: November 23, 1982
    Assignee: Imperial Chemical Industries Limited
    Inventors: Peter J. Barham, Alan Selwood
  • Patent number: 4342812
    Abstract: A process for producing a non-woven fabric and fabric produced thereby, the process comprising (1) forming a stack of three or more superimposed fibrous shims, in at least one of the shims the fibres being oriented predominantly in a first direction, corresponding to the machine direction of the shim, and in at least one of the other shims the fibres being oriented predominantly in a second direction, corresponding to the machine direction of the shim, which is inclined at an acute angle to an imaginary line which is orthogonal to the first direction, and in at least one of the other shims the fibres being oriented in a third direction, corresponding to the machine direction of the shim, which is inclined at an obtuse angle to an imaginary line which is orthogonal to the first direction, (2) bonding the fibrous shims together, (3) subjecting the bonded fabric so formed to a stentered operation in a direction orthogonal to the first direction which causes the bonded shims to expand orthogonally to the first di
    Type: Grant
    Filed: December 4, 1980
    Date of Patent: August 3, 1982
    Assignee: Imperial Chemical Industries Limited
    Inventor: Alan Selwood
  • Patent number: 4189512
    Abstract: Very highly parallelized staple fibre webs are described and defined in terms of three parameters related to longitudinal and lateral cohesive properties. A process for the preparation of these webs is also described.
    Type: Grant
    Filed: July 3, 1978
    Date of Patent: February 19, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: Peter M. Ellis, Alan Selwood
  • Patent number: 4188436
    Abstract: Abrasion resistant segmentally bonded non woven fabrics prepared from very highly parallelised staple fibre webs are described wherein the bonding pattern is applied to the web in a defined manner related to the direction of fibre orientation in the webs.
    Type: Grant
    Filed: July 3, 1978
    Date of Patent: February 12, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: Peter M. Ellis, Alan Selwood
  • Patent number: 4029535
    Abstract: A process for the seaming of two sheets of thermoplastic polymers, especially fabrics comprising thermoplastic fibres, by passing them around and through a pair of nip rolls and directing a pulsed laser beam at their line of confluence.
    Type: Grant
    Filed: September 1, 1976
    Date of Patent: June 14, 1977
    Assignee: Imperial Chemical Industries Limited
    Inventors: Cyril George Cannon, Alan Selwood
  • Patent number: 3978267
    Abstract: A compact yarn of staple fibers containing at least a proportion of potentially adhesive fibers bonded to contacting fibers. The compact yarn may be made by false twisting a sliver of the staple fibers by means of a fluid vortex followed by activating the potentially adhesive fibers.
    Type: Grant
    Filed: February 24, 1975
    Date of Patent: August 31, 1976
    Assignee: Imperial Chemical Industries Limited
    Inventor: Alan Selwood