Patents by Inventor William L. Barnes
William L. Barnes 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: 8129738Abstract: This invention relates to optoelectronic devices of improved efficiency. In particular it relates to light emitting diodes, photodiodes and photovoltaics. By careful design of periodic microstructures, e.g. gratings, associated with such devices more efficient light generation or detection is achieved.Type: GrantFiled: March 8, 2010Date of Patent: March 6, 2012Assignee: QinetiQ LimitedInventors: William L Barnes, John R Sambles, Ian R Hooper, Stephen Wedge
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Publication number: 20110024778Abstract: This invention relates to optoelectronic devices of improved efficiency. In particular it relates to light emitting diodes, photodiodes and photovoltaics. By careful design of periodic microstructures, e.g. gratings, associated with such devices more efficient light generation or detection is achieved.Type: ApplicationFiled: March 8, 2010Publication date: February 3, 2011Applicant: QINETIQ LIMITEDInventors: William L. Barnes, John R. Sambles, Ian R. Hooper, Stephen Wedge
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Patent number: 6906265Abstract: A cabled conductor comprises a plurality of transposed strands each comprising one or more preferably twisted filaments preferably surrounded or supported by a matrix material and comprising textured anisotropic superconducting compounds which have crystallographic grain alignment that is substantially unidirectional and independent of the rotational orientation of the strands and filaments in the cabled conductors. The cabled conductor is made by forming a plurality of suitable composite strands, forming a cabled intermediate from the strands by transposing them about the longitudinal axis of the conductor at a preselected strand lay pitch, and, texturing the strands in one or more steps including at least one step involving application of a texturing process with a primary component directed orthogonal to the widest longitudinal cross-section of the cabled intermediate, at least one such orthogonal texturing step occurring subsequent to said strand transposition step.Type: GrantFiled: January 25, 2001Date of Patent: June 14, 2005Assignee: American Superconductor CorporationInventors: Gregory L. Snitchler, Jeffrey M. Seuntjens, William L. Barnes, Gilbert N. Riley, Jr.
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Patent number: 6397454Abstract: An oxide superconducting cable is provided having a plurality of strands comprised of at least one oxide superconductor filament sheathed in a ductile and conductive metal matrix and least one of said strand further comprising a substantially continuous high resistivity coating substantially surrounding said at least one strand. The strands are positioned and arranged to form a cable. The cable is prepared by (a) applying a ductile predecessor coating to a plurality of strands, each said strand comprised of at least one oxide superconductor filament or a precursor thereto sheathed in a ductile metal matrix, and the ductile predecessor capable of conversion into a high resistivity material; (b) assembling the plurality of strands into a cable; and (c ) converting the ductile predecessor into a high resistivity material, where steps (a) and (b) can be performed in any order.Type: GrantFiled: September 25, 1996Date of Patent: June 4, 2002Assignee: American Superconductor Corp.Inventors: Jeffrey M. Seuntjens, Craig J. Christopherson, Gregory L. Snitchler, William L. Barnes, Kenneth DeMoranville
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Publication number: 20010027166Abstract: A cabled conductor comprises a plurality of transposed strands each comprising one or more preferably twisted filaments preferably surrounded or supported by a matrix material and comprising textured anisotropic superconducting compounds which have crystallographic grain alignment that is substantially unidirectional and independent of the rotational orientation of the strands and filaments in the cabled conductor. The cabled conductor is made by forming a plurality of suitable composite strands, forming a cabled intermediate from the strands by transposing them about the longitudinal axis of the conductor at a preselected strand lay pitch, and, texturing the strands in one or more steps including at least one step involving application of a texturing process with a primary component directed orthogonal to the widest longitudinal cross-section of the cabled intermediate, at least one such orthogonal texturing step occurring subsequent to said strand transposition step.Type: ApplicationFiled: January 25, 2001Publication date: October 4, 2001Applicant: American Superconductor Corporation Delaware CorporationInventors: Gregory L. Snitchler, Jeffrey M. Seuntjens, William L. Barnes, Gilbert N. Riley
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Patent number: 6284979Abstract: A cabled conductor is provided for use in a cryogenically cooled circuit including refrigeration having a predetermined operating temperature and efficiency. The conductor includes multiple conductor strands cabled about the longitudinal axis of the conductor at a preselected cabling period, each strand including a composite of superconducting ceramic in intimate contact with conductive matrix material. Each filament has high performance regions in which the filament material is well-textured with its preferred direction aligned perpendicular to the widest longitudinal cross-section of the conductor alternating with poorly superconducting regions which are at least about half the diameter of a filament in length and in which the superconducting ceramic filament is strained by transposition in excess of its critical strain limit. In the poorly superconducting regions, the conductive matrix material provides an alternate current path.Type: GrantFiled: May 5, 1997Date of Patent: September 4, 2001Assignee: American Superconductor CorporationInventors: Alexis P. Malozemoff, Gregory L. Snitchler, William L. Barnes, Alexander Otto, Gilbert N. Riley, Jr., Jeffrey M. Seuntjens
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Patent number: 6247225Abstract: A cabled conductor comprises a plurality of transposed strands each comprising one or more preferably twisted filaments preferably surrounded or supported by a matrix material and comprising textured anisotropic superconducting compounds which have crystallographic grain alignment that is substantially unidirectional and independent of the rotational orientation of the strands and filaments in the cabled conductor. The cabled conductor is made by forming a plurality of suitable composite strands, forming a cabled intermediate from the strands by transposing them about the longitudinal axis of the conductor at a preselected strand lay pitch, and, texturing the strands in one or more steps including at least one step involving application of a texturing process with a primary component directed orthogonal to the widest longitudinal cross-section of the cabled intermediate, at least one such orthogonal texturing step occurring subsequent to said strand transposition step.Type: GrantFiled: November 7, 1995Date of Patent: June 19, 2001Assignee: American Superconductor CorporationInventors: Gregory L. Snitchler, Jeffrey M. Seuntjens, William L. Barnes, Gilbert N. Riley, Jr.
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Patent number: 6194352Abstract: A method for preparing an oxide superconductor cable includes transposing a plurality of oxide superconductor strands along a longitudinal axis so as to form a cable and exposing the cable to a two step heat treatment after cabling of the oxide strands, the heat treatment comprising, (a) heating the cable to and maintaining the cable at a first temperature sufficient to partially melt the article, such that a liquid phase co-exists with the desired oxide superconductor phase; and (b) cooling the cable to and maintaining the cable at a second temperature sufficient to substantially transform the liquid phase into the desired oxide superconductor.Type: GrantFiled: November 7, 1995Date of Patent: February 27, 2001Assignee: American Superconductor CorporationInventors: Gilbert N. Riley, Jr., Jeffrey M. Seuntjens, William L. Barnes, Gregory L. Snitchler, Alexander Otto
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Patent number: 5225925Abstract: An optical fiber for amplifying or sourcing a light signal in a single transverse mode. The fiber comprises a host glass doped with erbium (Er) and a sensitizer such as ytterbium (Yb) or iron (Fe). Preferably the host glass is doped silicic glass (e.g., phosphate or borate doped). Electrical energy is provided to diode lasers that pump the Nd laser rod, which in turn pumps the fiber. Such a configuration for pumping the fiber provides a high energy transfer from the diodes to the Nd laser rod, which in turn enables high pumping powers to be coupled into the single-mode co-doped fiber. Based on the amplification characteristics of the co-doped fiber and the efficient coupling of power from the laser diodes, the amplifier provides power and small signal gains comparable to the best observed, while requiring only conventional and readily available diode-based pump sources.Type: GrantFiled: July 24, 1991Date of Patent: July 6, 1993Assignee: Amoco CorporationInventors: Stephen G. Grubb, Douglas W. Anthon, William L. Barnes, Janet E. Townsend