Patents Assigned to McMaster University
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Patent number: 9829744Abstract: A display illumination module for the illumination of a rear-projection screen is provided in which a first array of light sources is positioned adjacent to a first face of an optical modulating array layer for modulating the transmission of light emitted by the first array light sources. The first array light sources emit light within a defined angular range, and the optical modulating array layer is positioned relative to the first array of light sources so that light from adjacent light sources does not overlap at the optical modulating array layer. A second array of light sources is positioned adjacent to a second side of the optical modulation array layer and is arranged such that light from the second array of light sources does not pass through said optical modulation array layer and said second array of light sources does not substantially block light from the first array of light sources passing through the optical modulating array layer.Type: GrantFiled: April 7, 2015Date of Patent: November 28, 2017Assignee: McMaster UniversityInventor: Adrian Kitai
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Patent number: 9831360Abstract: Embodiments of the present disclosure provide devices and methods involving the thermal stabilization of microring resonators, such as microring modulators. Power is measured via an on-chip photodetector integrated with a drop port of the microring resonator, providing a local measurement of average power. This average power is employed as a feedback measure to actively control a heater that is integrated with the microring resonator, in order to stabilize the resonant wavelength of the microring resonator in the presence of thermal fluctuations. Employing such a system, a microring modulator can maintain error-free performance under thermal fluctuations that would normally render it inoperable.Type: GrantFiled: October 9, 2013Date of Patent: November 28, 2017Assignees: McMaster University, The Trustees of Columbia University in the City of New YorkInventors: Andrew Knights, Dylan Logan, Kishore Padmaraju, Keren Bergman
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Patent number: 9825470Abstract: A multi-source power converter is proposed to permit bidirectional DC to AC conversion from n (n?2 and n?) DC voltage sources to an AC load with a reduced number of switches, and DC to DC conversion. Both single and three phases AC load are considered. The proposed topology consists in a single stage of conversion, and therefore a high efficiency can be expected for the system. Any type of DC sources can be used in the system (fuel-cell, battery, ultra-capacitor, photo-voltaic cells, DC bus, DC to DC or AC to DC converter, etc.). The AC load can be either single or three phases (single-phase AC grid/microgrid, three-phase electric machines, induction machine, synchronous machine, etc.). There is no requirement for the n DC voltage source values; they can be equal or different and they can be used individually or together by the converter to generate the AC output. If different DC voltage values are used, the converter can be controlled to generate a multi-level AC voltage.Type: GrantFiled: October 25, 2013Date of Patent: November 21, 2017Assignee: McMaster UniversityInventors: Ali Emadi, Pierre Magne
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Patent number: 9824892Abstract: A method for growing semiconductor wafers by lateral diffusion liquid phase epitaxy is described. Also provided are a refractory device for practicing the disclosed method and semiconductor wafers prepared by the disclosed method and device. The disclosed method and device allow for significant cost and material waste savings over current semiconductor production technologies.Type: GrantFiled: May 17, 2012Date of Patent: November 21, 2017Assignee: McMaster UniversityInventors: Adrian Kitai, Haoling Yu, Bo Li
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Patent number: 9815910Abstract: Hydrophobic CNCs were successfully prepared by grafting amine- and thiol terminated hydrocarbons to CNCs that have been previously coated with plant polyphenols. Hydrocarbons of various chain lengths can be used to tune the hydrophobicity of the modified CNCs. After the surface modification process, CNCs can be easily redispersed in nonpolar solvents highlighting the potential of the hydrophobic CNCs in, for example, CNC reinforced nanocomposites and non-aqueous formulations.Type: GrantFiled: June 22, 2015Date of Patent: November 14, 2017Assignee: MCMASTER UNIVERSITYInventors: Zhen Hu, Emily Cranston
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Patent number: 9800827Abstract: Technologies and implementations for de-interlacing an interlaced digital video and up-converting a frame rate of a digital video are generally disclosed.Type: GrantFiled: February 26, 2016Date of Patent: October 24, 2017Assignee: MCMASTER UNIVERSITYInventors: Shahram Shirani, Roozbeh Dehghannasiri
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Patent number: 9758047Abstract: Various embodiments are described herein for a dual-voltage charging system for electrified vehicles. In one example embodiment, the dual-voltage charging system comprises an integrated active filter auxiliary power module (AFAPM), the integrated AFAPM is applied as an active power filter (APF) to compensate low frequency harmonics in a high voltage (HV) battery charger when the HV battery is charging, and applied as a low voltage (LV) battery charger auxiliary power module (APM) when the HV battery stops the charging and starts to charge the LV battery.Type: GrantFiled: November 12, 2015Date of Patent: September 12, 2017Assignee: McMaster UniversityInventors: Ruoyu Hou, Ali Emadi
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Publication number: 20170254068Abstract: A self-reinforced masonry block comprises a main body having opposed substantially parallel stacking surfaces and at least one tubular cell defined therethrough from one stacking surface to the other. At least one confining reinforcement is embedded in the main body to surrounding a corresponding cell. Each confining reinforcement extends substantially entirely along the longitudinal length of its corresponding cell and terminates inwardly of the stacking surfaces. The self-reinforced masonry blocks may be used in construction of a grout-filled, vertically reinforced masonry block wall, with the self-reinforced masonry blocks being used for those portions of the wall where the grouted cells are prone to crushing due to high levels of compressive stress, and conventional unreinforced masonry blocks being used for other portions of the wall. A method for making the self-reinforced masonry blocks is also described.Type: ApplicationFiled: May 20, 2017Publication date: September 7, 2017Applicant: MCMASTER UNIVERSITYInventors: Hamid TOOPCHINEZHAD, Robert DRYSDALE, Michael TAIT
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Patent number: 9742320Abstract: A method for controlling a switched reluctance motor, the method comprising: receiving a reference torque Te ref; receiving an indication of a present rotor position ? for the switched reluctance motor; determining at least one of: a reference current ie_ref(k?1) for a (k?1)th phase, a reference current ie_ref(k) for a (k)th phase, and a reference current ie_ref(k+1) for a (k+1)th phase; and outputting the determined at least one reference current to a current controller operatively coupled to the switched reluctance motor, wherein the determined at least one reference current is based on an objective function comprising the squares of phase current and derivatives of current reference.Type: GrantFiled: January 19, 2015Date of Patent: August 22, 2017Assignee: McMaster UniversityInventors: Jin Ye, Ali Emadi
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Patent number: 9742243Abstract: A switched reluctance machine designed for high-speed high-power operation. The switched reluctance machine has a rotor having a plurality of radially extending rotor poles, an interpolar filler positioned between the rotor poles, a stator having a plurality of stator poles extending radially inwardly from the inner surface of a machine frame, a stator winding positioned about each stator pole, wherein the stator wire has a rectangular cross-sectional profile, an axial cooling system, an end turn cooling system, and a cooling jacket positioned radially about the machine frame, and a power source configured to selectively supply electrical power to the one or more stator windings to induce rotation of the rotor.Type: GrantFiled: June 10, 2015Date of Patent: August 22, 2017Assignee: McMaster UniversityInventors: Earl Fairall, Berker Bilgin, Ali Emadi
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Patent number: 9722517Abstract: Various embodiments are described herein for a system and method to eliminate mutual flux effect on rotor position estimation of switched reluctance motor (SRM) drives at rotating shaft conditions without a prior knowledge of mutual flux. Neglecting the magnetic saturation, the operation of conventional self-inductance estimation using phase current slope difference method can be classified into three modes: Mode I, II and III. At positive-current-slope and negative-current-slope sampling point of one phase, the sign of current slope of the other phase changes in Mode I and II, but does not change in Mode III. In one example embodiment, in order to operate the self-inductance estimation in Mode III, a variable-hysteresis-band current control method is proposed for the incoming phase and variable-sampling method is proposed for the outgoing phase.Type: GrantFiled: April 1, 2015Date of Patent: August 1, 2017Assignee: McMaster UniversityInventors: Jin Ye, Ali Emadi
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Publication number: 20170150036Abstract: Technologies are generally described for automatically optimizing an efficiency of camera placement, numbers, and resolution in multi-camera monitoring and surveillance applications. In some examples, a fraction of a total area may be monitored at a higher resolution than the rest. Employing techniques such as combinatorial state Viterbi technique or combinatorial state trellis technique, a minimum number of cameras that provide the coverage at the needed resolution may be selected. Similarly, a number of points may be covered with at least a predefined number of cameras. For example, a subject of interest may be tracked in a public area, where specific camera(s) may be used to image the subject's face at a higher resolution than the background.Type: ApplicationFiled: February 1, 2017Publication date: May 25, 2017Applicant: McMaster UniversityInventors: Shahram Shirani, Shadrokh Samavi, Sayedmohammadreza Soroushmehr, Hamed Sadeghi
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Publication number: 20170146486Abstract: The present application is directed to the use of electrophoresis with UV detection in the determination of iodine nutritional status in human biological specimens, specifically for monitoring iodine deficiency/inadequacy in large-scale epidemiological studies. In particular, the present application is directed to a method for determining iodide and iodide uptake inhibitors in a human biological sample when using sample self-stacking with capillary electrophoresis and UV detection.Type: ApplicationFiled: September 30, 2016Publication date: May 25, 2017Applicant: McMaster UniversityInventor: Philip Britz-McKibbin
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Patent number: 9641119Abstract: Various embodiments are described herein for an extended-speed low-ripple torque control of a switched reluctance motor (SRM) using online torque sharing function (TSF). Two operational modes of an online TSF are defined during the commutation: In Mode I, absolute value of rate of change of flux linkage (ARCFL) of incoming phase is higher than outgoing phase; in Mode II, ARCFL of outgoing phase is higher than incoming phase. To compensate the torque error produced by imperfect tracking of phase current, a proportional and integral compensator with torque error is added to the torque reference of outgoing phase in Mode I and incoming phase in Mode II. Therefore, the total torque is determined by the phase with lower ARCFL rather than the phase with higher ARCFL as in conventional TSFs.Type: GrantFiled: December 10, 2014Date of Patent: May 2, 2017Assignee: McMaster UniversityInventors: Ali Emadi, Jin Ye
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Patent number: 9624551Abstract: The disclosure relates to a method of generating catalytic nucleic acid probes useful for detecting microorganisms such as bacterial pathogens. In one embodiment, the catalytic nucleic acid probes are fluorogenic DNAzymes. The disclosure also relates to catalytic nucleic acid probes and methods of using the probes for detecting microorganisms.Type: GrantFiled: March 8, 2012Date of Patent: April 18, 2017Assignee: McMaster UniversityInventors: Yingfu Li, M. Monsur Ali, Sergio D. Aguirre
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Patent number: 9621014Abstract: A double-rotor switched reluctance machine includes a stator, a first rotor, and a second rotor. The stator and the first rotor operate as a first electric machine and the stator and the second rotor operate as a second electric machine. Each electric machine has an output torque profile that fluctuates periodically between a maximum and a minimum instantaneous torque. The double-rotor switched reluctance machine is configured so that when the first and second electric machines are operated at a common electrical frequency, the first and second maximum instantaneous torques are temporally offset, thereby reducing the overall torque ripple of the switched reluctance machine. Additionally, or alternatively, a double-rotor switched reluctance machine is configured so that the first and second rotors are radially offset from each other to reduce a net radial force imposed on the stator by the operation of the first and second electric machines.Type: GrantFiled: July 30, 2015Date of Patent: April 11, 2017Assignee: McMaster UniversityInventors: Yinye Yang, Nigel Schofield, Ali Emadi
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Patent number: 9591272Abstract: Technologies are generally described for automatically optimizing an efficiency of camera placement, numbers, and resolution in multi-camera monitoring and surveillance applications. In some examples, a fraction of a total area may be monitored at a higher resolution than the rest. Employing techniques such as combinatorial state Viterbi technique or combinatorial state trellis technique, a minimum number of cameras that provide the coverage at the needed resolution may be selected. Similarly, a number of points may be covered with at least a predefined number of cameras. For example, a subject of interest may be tracked in a public area, where specific camera(s) may be used to image the subject's face at a higher resolution than the background.Type: GrantFiled: March 28, 2013Date of Patent: March 7, 2017Assignee: McMASTER UNIVERSITYInventors: Shahram Shirani, Shadrokh Samavi, Sayedmohammadreza Soroushmehr, Hamed Sadeghi
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Patent number: 9566282Abstract: Described are methods of treating a cancer comprising administering to a subject in need thereof an effective amount of a dopamine receptor (DR) antagonist. The DR antagonist may be a phenothiazine derivative, such as thioridazine or chlorpromazine. Optionally, the cancer is acute myeloid leukemia. Also described are methods for identifying subjects with cancer, methods for providing a prognosis for a subjects with cancer and methods for identifying subjects likely to be responsive to therapy with DR receptor antagonists. Methods for identifying cancer stem cells and chemotherapeutic compounds that are DR receptor antagonists as also provided. Also described are methods for the identification and validation of agents that target cancer stem cells.Type: GrantFiled: September 6, 2012Date of Patent: February 14, 2017Assignee: MCMASTER UNIVERSITYInventors: Mickie Bhatia, Tony Collins, Eleftherios Sachlos, Ruth Munoz Risueno
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Patent number: 9545738Abstract: A method for painting a complex or compound curved three-dimensional surface of a portion of an article. The method comprises providing a paint film (24); providing sheet metal (26) having opposite major surfaces; laminating the paint film onto a major surface of the sheet metal to form a painted sheet metal laminate (22) comprising a first portion and a second portion; permanently deforming the first portion of the painted sheet metal laminate into a formed portion of the article having a complex or compound curved three-dimensional shape; applying an initial force for securing the second portion of the painted sheet metal laminate during an initial stage of said permanently deforming step; and applying a later force for securing the second portion of the painted sheet metal laminate during a later stage of said permanently deforming step. The later applied force is greater than the initially applied force.Type: GrantFiled: August 15, 2012Date of Patent: January 17, 2017Assignees: 3M INNOVATIVE PROPERTIES COMPANY, MCMASTER UNIVERSITYInventors: Kent E. Nielsen, Mukesh K. Jain, Mohamed Elnagmi, Moisei Bruhis
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Patent number: 9492603Abstract: An artificial placenta oxygenating device for use with an infant is provided. The device comprises a first layer comprising a gas permeable membrane; and a second layer comprising a vascular network that permits circulation of fluid therethrough, wherein a portion of the gas permeable membrane is attached to and covers the vascular network, wherein the vascular network comprises an inlet that permits fluid flow into the vascular network and an outlet that permits fluid to flow out of the vascular network and wherein the inlet and outlet are positioned so that fluid flows through the vascular network and in contact with the gas permeable membrane to permit gas exchange to occur. Assemblies comprising a plurality of single artificial placenta devices is also provided.Type: GrantFiled: August 23, 2012Date of Patent: November 15, 2016Assignee: McMaster UniversityInventors: Christoph Fusch, Leslie Berry, Anthony Chan, Niels Rochow, Ponnambalam (Ravi) Selvaganapathy, John Brash, Gerhard Fusch