Patents by Inventor Terence J Shepherd
Terence J Shepherd 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).
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Patent number: 7734137Abstract: A multicore optical fibre includes a microstructured cladding material formed from a plurality of cladding elements arranged in an array and each cladding element comprising at least two different materials each having different refractive indices, and a plurality of core elements formed within interstitial regions between adjacent cladding elements. A fibre so formed may have a large number of cores per unit cross-sectional area as compared with prior art fibres, and thus allows the fibre to have relatively short distances between adjacent cores for a given required inter-core isolation. A fibre so formed has utility in many areas requiring high core density, such as inter-chip optical communication, or optical communication between circuit boards.Type: GrantFiled: March 23, 2006Date of Patent: June 8, 2010Assignee: QinetiQ LimitedInventors: Charlotte R H Bennett, Terence J Shepherd, Laurent Michaille, David M Taylor
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Publication number: 20100124397Abstract: A multicore optical fibre includes a microstructured cladding material formed from a plurality of cladding elements arranged in an array and each cladding element comprising at least two different materials each having different refractive indices, and a plurality of core elements formed within interstitial regions between adjacent cladding elements. A fibre so formed may have a large number of cores per unit cross-sectional area as compared with prior art fibres, and thus allows the fibre to have relatively short distances between adjacent cores for a given required inter-core isolation. A fibre so formed has utility in many areas requiring high core density, such as inter-chip optical communication, or optical communication between circuit boards.Type: ApplicationFiled: January 20, 2010Publication date: May 20, 2010Applicant: QinetiQ LimitedInventors: Charlotte R. H. Bennett, Terence J. Shepherd, Laurent Michaille, David M. Taylor
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Publication number: 20090067793Abstract: A multicore optical fibre includes a microstructured cladding material formed from a plurality of cladding elements arranged in an array and each cladding element comprising at least two different materials each having different refractive indices, and a plurality of core elements formed within interstitial regions between adjacent cladding elements. A fibre so formed may have a large number of cores per unit cross-sectional area as compared with prior art fibres, and thus allows the fibre to have relatively short distances between adjacent cores for a given required inter-core isolation. A fibre so formed has utility in many areas requiring high core density, such as inter-chip optical communication, or optical communication between circuit boards.Type: ApplicationFiled: March 23, 2006Publication date: March 12, 2009Inventors: Charlotte R.H. Bennett, Terence J. Shepherd, Laurent Michaille, David M. Taylor
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Patent number: 7338615Abstract: A novel method of fabrication of periodic dielectric composites involving a flexible computer design stage, rapid growth of a second dielectric component. Laser stereolithography is used to form the polymer material layer by layer by photopolymerisation of a liquid. Certain materials constructed in this fashion exhibit a complete loss-free barrier to microwave propagation through the material for a desired band of frequencies and are commonly known as photonic band gap crystals. Such materials could provide a novel medium for all-angle wide- and narrow-band blocking filters, narrow-band transmission filters, reflective and loss-free substrates for planar antennas, and novel loss-free media for oscillator cavities and waveguides. In addition a novel crystal structure, particularly suited to the fabrication method mentioned above and consisting of concatenated polyhedrons, is revealed.Type: GrantFiled: February 27, 2003Date of Patent: March 4, 2008Assignee: Qinetiq LimitedInventors: Terence J Shepherd, Paul R Tapster
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Patent number: 6797057Abstract: A method of growing robust large area colloidal photonic crystals and devices produced thereby. A suspension of monosized colloidal spheres (1) is subjected to a composite shear (6) by applying a sequential set of shearing forces. The crystalline layers within the colloid experience shearing forces with components in both x and y directions, forcing the colloid into a singe face-centered-cubic structure in preference to a twinned face-centered-cubic structure. The method may also comprise the use of a dispersion medium which is capable of undergoing a controllable phase change from a liquid phase to a solid phase. The crystal may be fixed into a single face-centered cubic structure.Type: GrantFiled: August 20, 2003Date of Patent: September 28, 2004Assignee: Qinetiq LimitedInventors: Richard M Amos, Paul R Tapster, John G Rarity, Terence J Shepherd, Stephen C Kitson
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Publication number: 20030151033Abstract: A novel method of fabrication of periodic dielectric composites involving a flexible computer design stage, rapid growth of a second dielectric component. Laser stereolithography is used to form the polymer material layer by layer by photopolymerisation of a liquid. Certain materials constructed in this fashion exhibit a complete loss-free barrier to microwave propagation through the material for a desired band of frequencies and are commonly known as photonic band gap crystals. Such materials could provide a novel medium for all-angle wide- and narrow-band blocking filters, narrow-band transmission filters, reflective and loss-free substrates for planar antennas, and novel loss-free media for oscillator cavities and waveguides. In addition a novel crystal structure, particularly suited to the fabrication method mentioned above and consisting of concatenated polyhedrons, is revealed.Type: ApplicationFiled: February 27, 2003Publication date: August 14, 2003Applicant: QinetiQ LimitedInventors: Terence J. Shepherd, Paul R. Tapster
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Patent number: 6547982Abstract: A method of fabricating a dielectric medium comprising two materials with discrete interfaces between the two materials and media formed from the dielectric medium.Type: GrantFiled: March 16, 1999Date of Patent: April 15, 2003Assignee: Qinetiq LimitedInventors: Terence J Shepherd, Paul R Tapster
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Patent number: 5475793Abstract: A heuristic processor incorporates a digital arithmetic unit arranged to compute the squared norm of each member of a training data set with respect to each member of a set of centers, and to transform the squared norms in accordance with a non-linear function to produce training .phi. vectors. A systolic array arranged for QR decomposition and least means squares processing forms combinations of the elements of each .phi. vector to provide a fit to corresponding training answers. The form of combination is then employed with like-transformed test data to provide estimates of unknown results. The processor is applicable to provide estimated results for problems which are non-linear and for which explicit mathematical formalisms are unknown.Type: GrantFiled: May 2, 1994Date of Patent: December 12, 1995Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: David S. Broomhead, Robin Jones, Terence J. Shepherd, John G. McWhirter
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Patent number: 5377306Abstract: A heuristic processor incorporates a digital arithmetic unit arranged to compute the squared norm of each member of a training data set with respect to each member of a set of centers, and to transform the squared norms in accordance with a nonlinear function to produce training .phi. vectors. A systolic array arranged for QR decomposition and least mean squares processing forms combinations of the elements of each .phi. vector to provide a fit to corresponding training answers. The form of combination is then employed with like-transformed test data to provide estimates of unknown results. The processor is applicable to provide estimated results for problems which are nonlinear and for which explicit mathematical formalisms are unknown.Type: GrantFiled: September 12, 1991Date of Patent: December 27, 1994Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: David S. Broomhead, Robin Jones, Terence J. Shepherd, John G. McWhirter
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Patent number: 5018065Abstract: A processor is provided which is suitable for constrained least squares computations. It incorporates a systolic array of boundary, internal, constraint and multiplier cells arranged as triangular and rectangular sub-arrays. The triangular sub-array contains boundary cells along its major diagonal and connected via delays, together with above-diagonal internal cells. It computes and updates a QR decomposition of a data matrix X incorporating successive data vectors having individual signals as elements. The rectangular sub-array incorporates constraint cell columns each implementing a respective constraint vector and terminating at a respective multiplier cell. The constraint cells store respective conjugate constraint factors obtained by constraint vector transformation in the triangular sub-array. Rotation parameters produced by QR decomposition in the triangular sub-array are employed by the rectangular sub-array to rotate a zero input and update stored constraint factors.Type: GrantFiled: October 13, 1988Date of Patent: May 21, 1991Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: John G. McWhirter, Terence J. Shepherd