Mizan
Ahmad Mizan, Ottawa CA
Patent application number | Description | Published |
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20110186858 | Gallium Nitride Power Devices Using Island Topography - A semiconductor device in provided having a substrate and a semiconductor layer formed on a main surface of the substrate. A plurality of first island electrodes and a plurality of second island electrodes are placed over the semiconductor layer. The plurality of first island electrodes and second island electrodes are spaced apart from each other so as to be alternatively arranged to produce two-dimensional active regions in all feasible areas of the semiconductor layer. Each side of the first island electrodes is opposite a side of the second island electrodes. The semiconductor device can also include a plurality of strip electrodes that are formed in the regions between the first island electrodes and the second island electrodes. The strip electrodes serve as the gate electrodes of a multi-island transistor. The first island electrodes serve as the source electrodes of the multi-island transistor. The second island electrodes serve as the drain electrodes of the multi-island transistor. A plurality of connections to the gate electrodes are provided at each interstice defined by corners of the first island electrodes and the second island electrodes. | 08-04-2011 |
20120138950 | ISLAND MATRIXED GALLIUM NITRIDE MICROWAVE AND POWER SWITCHING TRANSISTORS - A gallium nitride (GaN) device that has greatly superior current handling ability per unit area than previously described GaN devices. The improvement is due to improved layout topology. The layout scheme, which uses island electrodes rather than finger electrodes, is shown to increase the active area density over that of conventional interdigitated structures. Ultra low on resistance transistors can be built using the island topology. Specifically, the present invention, which uses conventional GaN lateral technology and electrode spacing, provides a means to enhance cost/effective performance of all lateral GaN structures. | 06-07-2012 |
20130049010 | HIGH DENSITY GALLIUM NITRIDE DEVICES USING ISLAND TOPOLOGY - A Gallium Nitride (GaN) series of devices—transistors and diodes are disclosed—that have greatly superior current handling ability per unit area than previously described GaN devices. The improvement is due to improved layout topology. The devices also include a simpler and superior flip chip connection scheme and a means to reduce the thermal resistance. A simplified fabrication process is disclosed and the layout scheme which uses island electrodes rather than finger electrodes is shown to increase the active area density by two to five times that of conventional inter-digitated structures. Ultra low on resistance transistors and very low loss diodes can be built using the island topology. Specifically, the present disclosure provides a means to enhance cost/effective performance of all lateral GaN structures. | 02-28-2013 |
Ahmad Mizan, Kanata CA
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20150162252 | FAULT TOLERANT DESIGN FOR LARGE AREA NITRIDE SEMICONDUCTOR DEVICES - A fault tolerant design for large area nitride semiconductor devices is provided, which facilitates testing and isolation of defective areas. A transistor comprises an array of a plurality of islands, each island comprising an active region, source and drain electrodes, and a gate electrode. Electrodes of each island are electrically isolated from electrodes of neighboring islands in at least one direction of the array. Source, drain and gate contact pads are provided to enable electrical testing of each island. After electrical testing of islands to identify defective islands, overlying electrical connections are formed to interconnect source electrodes in parallel, drain electrodes in parallel, and to interconnect gate electrodes to form a common gate electrode of large gate width Wg. Interconnections are provided selectively to good islands, while electrically isolating defective islands. This approach makes it economically feasible to fabricate large area GaN devices, including hybrid devices. | 06-11-2015 |
Tahmid Mizan, Bridgewater, NJ US
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20090166256 | Staged co-processing of biofeeds for manufacture of diesel range hydrocarbons - Processes are provided for producing a diesel fuel product having a sulfur content of 10 ppm by weight or less from feed sources that include up to 20% by weight of a biocomponent feedstock. The mineral hydrocarbon portions of the feed sources can be distillate or heavier feed sources. | 07-02-2009 |
Tahmid I. Mizan, Centreville, VA US
Patent application number | Description | Published |
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20100170830 | Mitigation of top of catalyst bed fouling - This invention relates to reactors with mitigation of fouling-related pressure buildup, the reactors having a reactor bed containing at least one catalyst layer through which reactants flow. The mitigation of fouling which occurs at the top of the reactor bed is accomplished by using at least one blowback ring located near the top of the reactor bed. | 07-08-2010 |
Tahmid I. Mizan, Bridgewater, NJ US
Patent application number | Description | Published |
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20100018905 | Deep hydrodesulfurization of hydrocarbon feedstreams - The distillate catalytic hydrodesulfurization of hydrocarbon fuels wherein the optimum hydrogen treat gas rate to maximize desulfurization is determined and introduced into the reaction zone to maintain a controlled amount of hydrogen at the surface of the catalyst during hydrodesulfurization. | 01-28-2010 |
20110219770 | METHODS OF UTILIZING WASTE HEAT FOR CREATING A PRESSURIZED WORKING FLUID - A method of utilizing waste heat to create a pressurized working fluid is disclosed. The method includes providing a vessel containing a sorbent system, introducing a feed of waste heat to a heat exchanger external to the vessel to heat a feed of working fluid, introducing the heated working fluid from the heat exchanger to the vessel to obtain pressurized working fluid, and directing the pressurized working fluid from the vessel to a work component. The method is particularly suited to make use of waste heat an industrial process, (e.g., a chemical processing or petrochemical refining operation) in which low grade heat source(s) are used to drive the sorption system. | 09-15-2011 |
20110219802 | SORPTION SYSTEMS HAVING IMPROVED CYCLE TIMES - The present invention relates to process modifications and apparatus designs that are conducive towards minimizing temperature swings (ΔT) useful to yield operating pressures that provide work and/or refrigeration (e.g., electricity and/or refrigeration) in sorption systems. Such process modifications and designs are particularly suited to make use of waste heat an industrial process, (e.g., a chemical processing or petrochemical refining operation) in which low grade heat source(s) are used to drive the sorption system. | 09-15-2011 |
20110232305 | SYSTEMS AND METHODS FOR GENERATING POWER AND CHILLING USING UNUTILIZED HEAT - The present application provides a sorption system for generating power and chilling that includes at least one absorber to absorb a working fluid in a liquid sorbent, a pump in fluid communication with the absorber to yield a feed of pressurized liquid sorbent and absorbed working fluid, a heat source to heat the feed of pressurized liquid sorbent and absorbed working fluid to yield a feed of working fluid at a supercritical state, a generator in fluid communication with the feed of working fluid at a supercritical state to yield power and a feed of working fluid in an at least partially condensed state, and an evaporator in fluid communication with the feed of working fluid in the at least partially condensed state to yield chilling and uncondensed working fluid. Additional systems and method for the generating power and chilling are provided. | 09-29-2011 |
20110232493 | METHOD OF PROTECTING A SOLID ADSORBENT AND A PROTECTED SOLID ADSORBENT - The present application provides a protected solid adsorbent that includes a solid adsorbent substrate and a surface layer at least partially coating the solid adsorbent substrate, the surface layer being generally permeable to an active agent. Additionally, a process for protecting a solid adsorbent and an adsorption system that includes a vessel containing the protected solid adsorbent is provided. | 09-29-2011 |
Tahmid I. Mizan, Coppell, TX US
Patent application number | Description | Published |
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20120122230 | METHODS FOR IDENTIFYING HIGH FOULING HYDROCARBON AND FOR MITIGATING FOULING OF PROCESS EQUIPMENT - Methods for determining the fouling propensity of a hydrocarbon stream and for reducing fouling are provided. In one method, the fouling propensity of a hydrocarbon stream is determined by obtaining a parameter value indicative of the fouling propensity at no less than two different temperatures, and an activation energy of fouling by the hydrocarbon stream is derived therefrom. In another method, the thus obtained parameter value at no less than two different temperatures and the activation energy are used to select proper heating fluids and operating temperature and to determine whether to add an antifoulant to the hydrocarbon stream to reduce fouling at a given temperature. | 05-17-2012 |
20130288883 | METHOD OF PROTECTING A SOLID ADSORBENT AND A PROTECTED SOLID ADSORBENT - A protected solid adsorbent is disclosed that includes a solid adsorbent substrate and a surface layer at least partially coating the solid adsorbent substrate, the surface layer being generally permeable to an active agent. Additionally, a process for protecting a solid adsorbent and an adsorption system that includes a vessel containing the protected solid adsorbent is provided. | 10-31-2013 |
20140262957 | EVALUATION OF DISTILLATE COMPOSITION OF A CRUDE - Methods are provided for characterizing crude oils, crude fractions, or other potential feedstocks for forming lubricating base oils in order to determine the suitability of a feedstock for lubricating base oil production. One type of characterization is to determine the isoparaffin, naphthene, and/or aromatics contents of the distillate portion of a feedstock. A second characterization is to determine the viscosity index of a distillate portion of a feedstock after dewaxing the distillate portion to a target pour point. | 09-18-2014 |