Patents Assigned to Raychem Limited
  • Terminated electric cable
    Patent number: 4791245
    Abstract: The termination of a high voltage electric cable includes a rigid heat shrinkable tube that extends between the cable jacket and a connector mounted on the cable conductor. The tube is made from an engineering plastic material and has a Flexural Modulus and a Young's Modulus high enough so as to ensure that the termination is self supporting. The termination may be used in the transmission of power from one carriage to another of an electric train.
    Type: Grant
    Filed: March 10, 1988
    Date of Patent: December 13, 1988
    Assignee: Raychem Limited
    Inventor: David W. M. Thornley
  • Heat-recoverable article
    Patent number: 4788089
    Abstract: Self-supporting helical heat-recoverable material provides easily installed insulating covering for wires and cables. The helical arrangement may be made by differential recovery of a two-layered tape of the heat-recoverable material around a cooled mandrel such that the inner tape layer recovers more than the outer. The inner layer may also serve as an adhesive layer or may carry an adhesive coating.
    Type: Grant
    Filed: March 5, 1986
    Date of Patent: November 29, 1988
    Assignee: Raychem Limited
    Inventor: Richard S. Skipper
  • Cable joint
    Patent number: 4778948
    Abstract: An arrangement for forming a joint between electrical cables comprises a connector arrangement, e.g. a crimp connector, a fusible block capable of being positioned to enclose the connector and a heat-shrinkable sleeve having a recovery temperature at least 10.degree. C. above the melting point of the fusible block. Preferably the fusible block is formed from a number of interlocking component parts. The arrangement is particularly suitable for forming joints between submarine cables, and may include a tubular shield portion for connecting the shields and shielded cables.
    Type: Grant
    Filed: July 9, 1987
    Date of Patent: October 18, 1988
    Assignee: Raychem Limited
    Inventors: Anthony R. L. Fitch, Evan Jarrett
  • Preparation of monomers
    Patent number: 4777282
    Abstract: Organic compounds having functional groups such as aromatic ester, thioester, or carbonate groups are prepared by reacting an organo- germanium, tin, or lead reactant with a suitable second reactant. For example, the ester ##STR1## is prepared by reacting the bis-tri-n-butyl tin derivative of hydroquinone with p-phenoxybenzoyl chloride.
    Type: Grant
    Filed: June 3, 1986
    Date of Patent: October 11, 1988
    Assignee: Raychem Limited
    Inventor: Ian D. H. Towle
  • Electric wire and cable
    Patent number: 4767668
    Abstract: Electrical wire and cable is provided with a layer of insulation or jacketing material which comprises a mixture of: (1) a polyester based on tetramethylene terephthalate, preferably polytetramethylene terephthalate; and (2) more than 40%, based on polymer (1), of a block copolymer preferably having polytetramethylene terephthalate hard blocks and poly(polytetramethylene oxide terephthalate) soft blocks. Polymer (2) has a flex modulus of at least 69 MPa preferably at least 138 MPa. The insulation or jacketing material exhibits improved resistance to stress crazing in a number of solvents.
    Type: Grant
    Filed: July 10, 1986
    Date of Patent: August 30, 1988
    Assignee: Raychem Limited
    Inventors: Timothy S. Smith, David W. M. Thornley
  • Electrically conductive composite material
    Patent number: 4764422
    Abstract: Electrically conductive composite material comprises:(a) an open-celled cellular structure of polymeric material, preferably an open-celled foam, having electrically conductive material on at least its interior surface defining the cells, e.g. deposited metal; and(b) substantially solid, preferably non-conductive, material overlying and/or filling the cellular structure.The solid material (b) is preferably polymeric and may be formed in situ by polymerization of a monomer oligomer or may be introduced e.g. in molten form.The material is useful for electromagnetic shielding, e.g. for cable feedthrough glands or dimensionally recoverable articles.
    Type: Grant
    Filed: November 21, 1986
    Date of Patent: August 16, 1988
    Assignee: Raychem Limited
    Inventors: Frederick W. L. Hill, Nigel R. Bates, Leo G. Svendsen
  • Recoverable article for encapsulation
    Patent number: 4761193
    Abstract: A recoverable article comprises a recoverable fabric, means for rendering the fabric impervious, and a shaped liner. The assembly can be used to form a pressure resistant splice case for telecommunications cables.
    Type: Grant
    Filed: October 30, 1986
    Date of Patent: August 2, 1988
    Assignee: Raychem Limited
    Inventors: Kenneth B. Pithouse, Thomas A. Kridl, James T. Triplett
  • Method of environmental sealing
    Patent number: 4761194
    Abstract: A method of environmentally sealing a pipe, cable or harness substrate by means of a recoverable fabric and a sheet of polymeric material.
    Type: Grant
    Filed: June 24, 1986
    Date of Patent: August 2, 1988
    Assignee: Raychem Limited
    Inventors: Kenneth B. Pithouse, Thomas A. Kridl, James T. Triplett
  • Polymer membrane
    Patent number: 4755540
    Abstract: Porous membranes of aromatic polymer (preferably ether ketone) are prepared with pore size and surface area allowing use in place of asbestos membranes in hot alkaline electrolysis cells. The membranes are prepared by solvent extraction of a polymer which is "partially incompatible" with the aromatic from a blend of the two. The membranes are preferably dried in the presence of a surfactant to enhance re-wetting in use.
    Type: Grant
    Filed: May 20, 1985
    Date of Patent: July 5, 1988
    Assignee: Raychem Limited
    Inventor: Susan V. Blakey
  • Stabilized-alumina filled thermoplastics
    Patent number: 4743644
    Abstract: A water stabilizer polymeric composition incorporating a hydrated alumina filler, which is characterized by the presence of an effective amount of an antimony V compound. The compositions have a reduced tendency to absorb water and specific compositions find applicaiton as electrical insulation and in the production of dimensionally recoverable article.
    Type: Grant
    Filed: March 23, 1987
    Date of Patent: May 10, 1988
    Assignee: Raychem Limited
    Inventors: Richard S. Skipper, Richard J. Penneck
  • Curable fabric member
    Patent number: 4735833
    Abstract: A latent curing fibre is produced by coating a glass fibre with an (optional) thermoplastic (polyamide) adhesion-promoting layer, a (preferably brittle) curing agent layer (e.g. styrene/maleic anhydride), and a flexible curable layer of epoxy plus curable polyester. Composites of this fibre with non-reactive glass braids consolidate and cure exceptionally well under a heat-shrink sleeve to provide Class F electrical insulation.
    Type: Grant
    Filed: December 3, 1985
    Date of Patent: April 5, 1988
    Assignee: Raychem Limited
    Inventors: Achilles Chiotis, Darren J. Collett
  • Curable fabric
    Patent number: 4729920
    Abstract: Curable fabric comprising first and second curing reactants, at least one of which is in the form of a fabric member, and comprising heat-recoverable fabric members.
    Type: Grant
    Filed: February 14, 1986
    Date of Patent: March 8, 1988
    Assignee: Raychem Limited
    Inventors: Robert H. McLoughlin, Kenneth B. Pithouse, David J. Barker
  • Method of making coaxial cable
    Patent number: 4715098
    Abstract: A piezoelectric coaxial cable comprises a central stretchable electrical conductor (1), preferably formed from a low melting point metal alloy, a piezoelectric intermediate layer (2), preferably formed from a vinylidene fluoride polymer which has been stretched and radially polarized to render it piezoelectric, and an outer electrical conductor (3).The intermediate layer has a ratio R of its internal radius to its external radius which is preferably not more than 0.5 and more preferably not more than 0.4. This construction enables coaxial cables to be formed without voiding or breaking of the internal conductor during stretching.
    Type: Grant
    Filed: August 15, 1986
    Date of Patent: December 29, 1987
    Assignee: Raychem Limited
    Inventors: Michael Booth, Richard J. Penneck
  • Fibre reinforced polymeric article
    Patent number: 4709948
    Abstract: Pipe couplings are formed by consolidation of a polymer into braided fibre reinforcement by recovery of a heat-recoverable driver thereover. A liner, e.g. of non-cross-linked polyvinylidene fluoride, may be used, preferably with three layers of polymer/braid, to achieve a Freon-tight seal for coupling loosely swaged or butt-jointed refrigerator pipes. Braids carrying a consolidatable polymer which allows the braid crossover points to slip freely during recovery of the driver are preferred for optimum performance.
    Type: Grant
    Filed: February 18, 1986
    Date of Patent: December 1, 1987
    Assignee: Raychem Limited
    Inventors: Joel Archer, Denis V. Wassenhove, Kenneth B. Pithouse, Leslie J. Buck, Jeffrey P. Molyneux, Peter S. Bradshaw
  • Heat-recoverable article
    Patent number: 4707388
    Abstract: A dimensionally recoverable article, preferably a heat-recoverable article, has on at least part of a surface thereof an adhesive composition that will cure by reaction of a plurality of mutually reactive components. The components are in the form of particles which are mixed together and which will fuse when heated. Preferred adhesives are based on combinations of an epoxy with a polyamide, carboxylic acid, phenolic resin or blocked isocyanate curing agent.The particulate adhesives show a synergistic increase in rate and/or level of cure when used in conjunction with a recoverable article.
    Type: Grant
    Filed: January 23, 1986
    Date of Patent: November 17, 1987
    Assignee: Raychem Limited
    Inventors: George B. Park, David J. Barker
  • Electrical crimp connection
    Patent number: 4707566
    Abstract: An electrical connection to an insulated wire having a conductor that is softer than the wire insulation, for example a piezoelectric vinylidine fluoride polymer wire having a low melting point conductor, comprises a conductive crimping element that is crimped onto the wire. The crimping element has been deformed to a relatively small extent such that it does not penetrate the wire insulation but causes the low melting point metal conductor to exude out of the wire into contact on the electrically conductive connection element, e.g. the closed end of the crimp.
    Type: Grant
    Filed: July 15, 1986
    Date of Patent: November 17, 1987
    Assignee: Raychem Limited
    Inventors: Ian R. A. Titcombe, Ian A. Strange
  • Protected electrode article
    Patent number: 4675258
    Abstract: A protected electrode article comprising sensitive electrode material having a layer of protective material bonded to at least part of its surface by means of an adhesive which can be made to swell by treatment with liquid, so as to increase the permeability of the adhesive to electrolyte which is encountered by the protected electrode material when incorporated in an electrochemical device.
    Type: Grant
    Filed: October 30, 1986
    Date of Patent: June 23, 1987
    Assignee: Raychem Limited
    Inventors: Robert H. McLoughlin, John A. Cook, George B. Park
  • Cable with flame retarded cladding
    Patent number: 4659871
    Abstract: Polymeric cladding for elongate substrates, preferably electrical conductors, comprises an inner layer and an outer layer, the outer layer being a cross-linked polymer composition filled with halogen-free particulate inorganic flame-retardant filler which has been treated with material which increases the elongation to break of the composition at 200.degree. C. to at least 50%. The enhanced elongation enables the cladding better to resist burning, possibly by reducing the tendency for the outer layer to split when exposed to fire. Bundles of insulated electrical wires may be wrapped in mineral tape, preferably mica tape, to provide circuit integrity cables which are significantly smaller and/or lighter than previously known.
    Type: Grant
    Filed: June 24, 1986
    Date of Patent: April 21, 1987
    Assignee: Raychem Limited
    Inventors: Timothy S. Smith, Richard J. Murphy
  • Recoverable article for screening
    Patent number: 4639545
    Abstract: A recoverable fabric for example a weave having a conductive metal warp and a recoverable polymeric weft may be provided with solder to provide an article for screening electrical components.
    Type: Grant
    Filed: February 5, 1985
    Date of Patent: January 27, 1987
    Assignee: Raychem Limited
    Inventors: Kenneth B. Pithouse, Thomas P. H. Jones, Frank J. Lowe, Richard S. Skipper
  • Heat-recoverable article
    Patent number: 4631098
    Abstract: A heat recoverable article comprises a recoverable fabric and a polymeric layer of at least 0.03 mm thickness, and preferably unstressed. Such an article can be recovered by means of a torch to provide an environmental seal around substrates such as cables and pipes.
    Type: Grant
    Filed: December 30, 1983
    Date of Patent: December 23, 1986
    Assignee: Raychem Limited
    Inventors: Kenneth B. Pithouse, Thomas A. Kridl, James T. Triplett