Patent application number | Description | Published |
20130303821 | Systems and Methods of Inhibiting Foam Formation Using Multiphase Turbines - Systems and methods for inhibiting foam formation in an acid gas removal system are provided. Preconditioning a rich amine or triethylene glycol stream exiting an absorber of an acid gas removal system through a rotary separation turbine can provide pre-separation of gas from rich amine or triethylene glycol, as well as effectively reduces or inhibits foam formation. Systems provided enhance plant reliability and also recovers hydraulic power into electricity. | 11-14-2013 |
20140066683 | Process, Method, and System for Removing Heavy Metals from Fluids - A method for concurrently transporting and removing trace amount levels of heavy metals such as mercury from produced fluids such as natural gas, with the injection of a complexing agent and a hydrate inhibitor into the pipeline for use in transporting the produced fluid. Volatile mercury in the natural gas is removed while the produced fluid is being transported in the pipeline, with the hydrate inhibitor suppressing or decreasing the formation of the hydrate that would cause plugging in the pipeline. The complexing agent reacts with the volatile mercury in the natural gas, forming precipitate or soluble mercury complexes in the aqueous phase. The aqueous phase containing the hydrate inhibitor, unreacted complexing agent, and mercury complexes is subsequently recovered and can be re-used in the pipeline. | 03-06-2014 |
20140072488 | Process, Method, and System for Removing Mercury from Fluids - Trace levels of mercury in a natural gas are removed in a gas processing plant in an amine unit and/or a dehydrator. The mercury removal occurs concurrently with the removal of acid gases in an amine unit, e.g., an absorber or scrubber, with an amine solution containing a complexing agent. The mercury removal can also be carried out concurrently with the removal of water in a glycol dehydrator with the addition of a complexing agent to the glycol solution. Volatile mercury in the natural gas is removed by the complexing agent, forming non-volatile mercury species in the rich amine/glycol solution. | 03-13-2014 |
20140072489 | Process, Method, and System for Removing Mercury from Fluids - Trace levels of mercury in a natural gas are removed in a gas processing plant in an amine unit and/or a dehydrator. The mercury removal occurs concurrently with the removal of acid gases in an amine unit, e.g., an absorber or scrubber, with an amine solution containing a complexing agent. The mercury removal can also be carried out concurrently with the removal of water in a glycol dehydrator with the addition of a complexing agent to the glycol solution. Volatile mercury in the natural gas is removed by the complexing agent, forming non-volatile mercury species in the rich amine/glycol solution. | 03-13-2014 |
20140230650 | METHOD TO RETROFIT SYSTEM WITH ENHANCED CAPACITY FOR REMOVING MERCURY FROM A PRODUCED HYDROCARBON FLUID. - A method for retrofitting a system for removing mercury and water from a gas stream is disclosed. A system is provided including a first water removal unit and a second mercury removal unit in fluid communication with the first water removal unit. The first water removal unit has a fixed capacity or reservoir for containing mole sieves for removing water from a gas stream. The second mercury removal unit has a fixed capacity or reservoir for containing mole sieves for removing mercury from the gas stream. The second mercury removal unit is filled with mole sieves adapted for removing mercury from a gas stream containing mercury. The first water removal unit is retrofit by replacing a first portion of mole sieves adapted for removing water from the gas stream with a second portion of mole sieves adapted for removing mercury. The capacity of the system for removing mercury is thereby enhanced relative to a system of the same size wherein the first water removal unit is filled with water removing mole sieves and no mercury removing mole sieves. | 08-21-2014 |
Patent application number | Description | Published |
20080215848 | Method and System For Caching Address Translations From Multiple Address Spaces In Virtual Machines - A method of virtualizing memory through shadow page tables that cache translations from multiple guest address spaces in a virtual machine includes a software version of a hardware tagged translation look-aside buffer. Edits to guest page tables are detected by intercepting the creation of guest-writable mappings to guest page tables with translations cached in shadow page tables. The affected cached translations are marked as stale and purged upon an address space switch or an indiscriminate flush of translations by the guest. Thereby, non-stale translations remain cached but stale translations are discarded. The method includes tracking the guest-writable mappings to guest page tables, deferring discovery of such mappings to a guest page table for the first time until a purge of all cached translations when the number of untracked guest page tables exceeds a threshold, and sharing shadow page tables between shadow address spaces and between virtual processors. | 09-04-2008 |
20080320194 | MONITORED NOTIFICATION FACILITY FOR REDUCING INTER-PROCESS / INTER-PARTITION INTERRUPTS - Example operations related to deferring interrupts are herein disclosed. In one example embodiment, a method includes, but is not limited to, writing a message to a memory location shared between a sender and a receiver; and requesting that an interrupt be transmitted to the receiver after a specified latency has elapsed, wherein an interrupt that is pending is stored in a trigger memory. It can be appreciated by one of skill in the art that one or more various aspects of the disclosure may include but are not limited to circuitry and/or programming for effecting the herein-referenced aspects; the circuitry and/or programming can be virtually any combination of hardware, software, and/or firmware configured to effect the herein-referenced aspects depending upon the design choices of the system designer. In addition to the foregoing, other aspects are described in the claims, drawings, and text forming a part of the present application. | 12-25-2008 |
20100031254 | Efficient detection and response to spin waits in multi-processor virtual machines - Various aspects are disclosed herein for attenuating spin waiting in a virtual machine environment comprising a plurality of virtual machines and virtual processors. Selected virtual processors can be given time slice extensions in order to prevent such virtual processors from becoming de-scheduled (and hence causing other virtual processors to have to spin wait). Selected virtual processors can also be expressly scheduled so that they can be given higher priority to resources, resulting in reduced spin waits for other virtual processors waiting on such selected virtual processors. Finally, various spin wait detection techniques can be incorporated into the time slice extension and express scheduling mechanisms, in order to identify potential and existing spin waiting scenarios. | 02-04-2010 |
20140122830 | Operational Efficiency of Virtual TLBs - Various mechanisms are disclosed for improving the operational efficiency of a virtual translation look-aside buffer (TLB) in a virtual machine environment. For example, one mechanism fills in entries in a shadow page table (SPT) and additionally, speculatively fills in other entries in the SPT based on various heuristics. Another mechanism allows virtual TLBs (translation look-aside buffers) to cache partial walks in a guest page table tree. Still another mechanism allows for dynamic resizing of the virtual TLB to optimize for run-time characteristics of active workloads. Still another mechanism allows virtual machine monitors (VMMs) to support legacy and enlightened modes of virtual TLB operation. Finally, another mechanism allows the VMM to remove only the stale entries in SPTs when linking or switching address spaces. All these mechanisms, together or in part, increase the operational efficiency of the virtual TLB. | 05-01-2014 |
Patent application number | Description | Published |
20080233167 | UROLOGICAL MEDICAL DEVICES FOR RELEASE OF PROSTATICALLY BENEFICIAL THERAPEUTIC AGENTS - According to an aspect of the invention, urological medical devices are provided, which comprise a prostatically beneficial agent selected from alpha-adrenergic blockers, antispasmodic agents, anticholinergic/antimuscarinic agents, calcium channel blockers, anti-inflammatory agents, hormone-affecting agents, anti-cancer agents, and combinations thereof, among others. The urological medical devices are adapted for implantation or insertion into a subject's urinary tract, whereupon at least a portion of the prostatically beneficial agent is released into the subject's prostatic urethra. The release profile of the prostatically beneficial agent is effective to treat a prostatic disorder, for example, benign prostate hypertrophy, prostate cancer or prostatitis, among others. Other aspects of the invention are directed to treating prostatic disorders. | 09-25-2008 |
20080234659 | UROLOGICAL MEDICAL DEVICES FOR RELEASE OF THERAPEUTIC AGENTS - According to an aspect of the present invention, urological medical devices are provided, which contain one or more urologically beneficial agents selected from alpha-adrenergic blockers, calcium channel blockers, and combinations thereof, among others. The urological devices are adapted for implantation or insertion into a subject's urinary tract, whereupon at least a portion of the urologically beneficial agent is released. Such agents are urologically beneficial, for example, in that they may relieve pain and/or discomfort associated with the medical device and/or act as stone expulsion agents (i.e., they facilitate stone passage), among other benefits. According to an aspect of the present invention, a method of treating kidney stones is provided which comprises: (a) diagnosing the presence of kidney stones within a subject and (b) implanting or inserting a urological medical device into the subject which contains at least one urologically beneficial agent. The medical device is adapted to release the at least one urologically beneficial agent in vivo in an amount effective to promote kidney stone expulsion. | 09-25-2008 |
20090012603 | IMPLANTABLE MEDICAL DEVICES HAVING ADJUSTABLE PORE VOLUME AND METHODS FOR MAKING THE SAME - The present invention is directed to implantable medical devices which may be used for controllably releasing a therapeutic agent within a patient and methods for making the same. These medical devices may include porous coatings, which may be polymer-free, located on an outer surface or abluminal surface of the medical device. The medical device may be a stent. The pores of the porous coating may be expandable to facilitate loading of the therapeutic agent. The medical device may be triggerable upon implantation of the medical device such that the volume of the voids shrinks to eject the therapeutic agent. The voids may be slots in the stent. Expandable materials or structures may be positioned in the voids to expand upon implantation and eject the therapeutic agent. | 01-08-2009 |
20090281635 | ANTIMICROBIAL MEDICAL DEVICES - According to an aspect of the present invention, medical devices are provided whose surfaces are partially covered with a coating that further comprises silver nanoparticles. Other aspects of the invention pertain to methods of making and using such medical devices. | 11-12-2009 |
20110171272 | UROLOGICAL MEDICAL DEVICES FOR RELEASE OF PROSTATICALLY BENEFICIAL THERAPEUTIC AGENTS - According to an aspect of the invention, urological medical devices are provided, which comprise a prostatically beneficial agent selected from alpha-adrenergic blockers, antispasmodic agents, anticholinergic/antimuscarinic agents, calcium channel blockers, anti-inflammatory agents, hormone affecting agents, anti-cancer agents, and combinations thereof, among others. The urological medical devices are adapted for implantation or insertion into a subject's urinary tract, whereupon at least a portion of the prostatically beneficial agent is released into the subject's prostatic urethra. The release profile of the prostatically beneficial agent is effective to treat a prostatic disorder, for example, benign prostate hypertrophy, prostate cancer or prostatitis, among others. Other aspects of the invention are directed to treating prostatic disorders. | 07-14-2011 |
20130085451 | PLASMA-TREATED DIALYSIS CATHETER CUFF - A catheter is disclosed. The catheter includes an elongated tubular body defining a longitudinal axis and extending to a distal end thereof, the tubular body having at least one lumen and a cuff disposed around the tubular body configured to contact tissue, the cuff formed from a plasma-treated material having enhanced tissue ingrowth properties. | 04-04-2013 |
20140249362 | IMPLANTABLE MESH COMBINING BIODEGRADABLE AND NON-BIODEGRADABLE FIBERS - Disclosed are mesh materials adapted for use in an implantable sling. The mesh materials include biodegradable and non-degradable components that may be adapted to facilitate scar-tissue ingrowth as the biodegradable components degrade. | 09-04-2014 |
20140277400 | COATED MEDICAL DEVICES AND METHODS OF MAKING AND USING SAME - Coating methods and related devices are provided. Such devices can include stents. For example, the device can comprise a sidewall and a plurality of pores in the sidewall that are sized to inhibit flow of blood through the sidewall into an aneurysm to a degree sufficient to lead to thrombosis and healing of the aneurysm when the tubular member is positioned in a blood vessel and adjacent to the aneurysm. The device can also comprise an anti-thrombogenic coating distributed over at least a portion of the device such that the pores are substantially free of webs formed by the coating. | 09-18-2014 |
20150081003 | COATED MEDICAL DEVICES AND METHODS OF MAKING AND USING SAME - Coating methods and related devices are provided. Such devices can include stents. For example, the device can comprise a sidewall and a plurality of pores in the sidewall that are sized to inhibit flow of blood through the sidewall into an aneurysm to a degree sufficient to lead to thrombosis and healing of the aneurysm when the tubular member is positioned in a blood vessel and adjacent to the aneurysm. The device can also comprise an anti-thrombogenic coating distributed over at least a portion of the device such that the pores are substantially free of webs formed by the coating. | 03-19-2015 |
20150140344 | COATED MEDICAL DEVICES - Processes for coating medical devices are provided herein. The processes include contacting a substrate with a sulfur-functional silane and an additional silane. The resulting coating includes a silane layer having improved adherence to the medical device, covering a greater area. | 05-21-2015 |
20150148882 | ANTI-THROMBOGENIC MEDICAL DEVICES AND METHODS - Methods for applying layers to medical devices and related devices are provided. Such devices can include stents. For example, the device can include a sidewall and a plurality of pores in the sidewall that are sized to inhibit flow of blood through the sidewall into an aneurysm to a degree sufficient to lead to thrombosis and healing of the aneurysm when the tubular member is positioned in a blood vessel and adjacent to the aneurysm. The device can have an anti-thrombogenic outer layer distributed over at least a portion of the device. | 05-28-2015 |
Patent application number | Description | Published |
20080320295 | METHOD AND APPARATUS FOR VIRTUALIZATION OF APPLIANCES - A method and apparatus for the virtualization of appliances provides an embedded operating system (OS) which is included in the system boot ROM of a personal computer. When the system boots, the OS is launched and looks for all available virtual appliances from, for example, the following places: local USB, flash card, e.g. SD, xD, CF, CDROM/DVD, or other storage media; local hard disk storage; and the Internet, e.g. an appliance server. The user selects an appliance to use from the OS, whereupon the appliance is loaded and launched. If the selected appliance is not on a local storage, then it is downloaded, e.g. over the Internet from an appliance server. The downloaded appliance can be cached in local storage media such that, the next time it is needed, it need not be downloaded from the appliance server. The user can also elect to boot an operating system from the hard disk, if an operating system and hard disk are installed, or to power-off the system. | 12-25-2008 |
Patent application number | Description | Published |
20130122327 | APPARATUS AND METHOD FOR IMPARTING SELECTED TOPOGRAPHIES TO ALUMINUM SHEET METAL - A method for surface treating work rolls to produce isotropic textured aluminum sheet features shot-peening the surface of the working rolls that produce the sheet. The media may be steel balls, such as ball bearings or other media, such as glass or ceramic balls, depending upon the optical properties desired for the aluminum sheet, e.g., in terms of diffuseness or brightness of reflection. The various parameters of shot-peening can be varied to accommodate given properties of the roll, such as hardness and existing surface texture to achieve a given desired surface texture. A sheet surface with target properties and the work roll processing needed to produce it may be generated by computer modeling. | 05-16-2013 |
20130273394 | Apparatus and Method for Imparting Selected Topographies to Aluminum Sheet Metal - A method for surface treating work rolls to produce isotropic textured aluminum sheet features indenting the surface of the working rolls that produce the sheet with spherical media such as steel ball bearings having the requisite properties to avoid fracture and resulting in a smooth surface lacking facets. The spherical media can be introduced into a nip between two rolls and indent by compression, but ultrasonic peening or knurling. The aluminum sheet produced by the roll has properties that facilitate mechanical forming, such as when the sheet is processed by forming tools. | 10-17-2013 |
20140060700 | APPARATUS AND METHOD FOR IMPARTING SELECTED TOPOGRAPHIES TO ALUMINUM SHEET METAL AND APPLICATION THERE FOR - A material handler formed from isotropic textured aluminum sheet rolled by rolls indented with spherical media, such as steel ball bearings, producing a sheet with a low coefficient of friction relative to particulate matter like flour. The slippery sheeting may be used to make tanks, silos, conduits and guides to facilitate storage and flow of the particulate matter. | 03-06-2014 |
Patent application number | Description | Published |
20080299599 | FLUORESCENT PROTEINS FOR MONITORING INTRACELLULAR SUPEROXIDE PRODUCTION - Protein probes and methods for measuring real-time changes in intracellular superoxide formation are provided. The probes include superoxide sensitive variants of yellow fluorescent and green fluorescent proteins. The probes, or nucleic acids encoding the probes, may be delivered to cells or organisms. Changes in the fluorescence of the probes may then be detected using standard real-time fluoroscopy techniques. | 12-04-2008 |
20090149540 | Compositions and Methods for Attenuating Mitochondria-Mediated Cell Injury - The present invention relates to a S-nitrosated mitochondria-targeted thiol-based antioxidant prodrug and uses therefore for the prevention or treatment of diseases or conditions associated with mitochondrial dysfunction resulting from changes in the mitochondrial redox environment. When activated, prodrug of the present invention can specifically provide a NO* donor and a thiol-based antioxidant to mitochondria thereby decreasing the degree of mitochondrial dysfunction. | 06-11-2009 |
20090298782 | Compounds for Delivering Amino Acids or Peptides with Antioxidant Activity into Mitochondria and Use Thereof - Disclosed are compounds containing single amino acids, peptides, or derivatives thereof which are selectively delivered to the mitochondria of a cell. Compounds of the invention exhibit antioxidant activity thereby reducing reactive oxygen species in cells. These compounds are useful for inhibiting oxidative stress-induced cell injury or death both in vivo and ex vivo. In addition, methods for the synthesis of these compounds are disclosed. | 12-03-2009 |
20090306125 | Mitochondria-Targeted Antioxidant Prodrugs and Methods of Use - The present invention is a mitochondria-targeted antioxidant prodrug useful for the prevention or treatment of diseases or conditions associated with mitochondrial dysfunction resulting from changes in the mitochondrial redox environment. Antioxidant prodrugs of the invention are produced by modifying an antioxidant to a fatty acid so that the resulting prodrug is targeted to and activated by an enzyme of mitochondrial fatty acid beta-oxidation. | 12-10-2009 |
20100168198 | Mitochondria-targeted antioxidant prodrugs and methods of use - The present invention is a mitochondria-targeted antioxidant prodrug useful for the prevention or treatment of diseases or conditions associated with mitochondrial dysfunction resulting from changes in the mitochondrial redox environment. Antioxidant prodrugs of the invention are produced by modifying an antioxidant to a fatty acid so that the resulting prodrug is targeted to and activated by an enzyme of mitochondrial fatty acid beta-oxidation. | 07-01-2010 |
20110257107 | Compounds for Delivering Amino Acids or Peptides with Antioxidant Activity into Mitochondria - Disclosed are compounds containing single amino acids, peptides, or derivatives thereof which are selectively delivered to the mitochondria of a cell. Compounds of the invention exhibit antioxidant activity thereby reducing reactive oxygen species in cells. These compounds are useful for inhibiting oxidative stress-induced cell injury or death both in vivo and ex vivo. In addition, methods for the synthesis of these compounds are disclosed. | 10-20-2011 |
Patent application number | Description | Published |
20100127125 | METAL SHEETS AND PLATES HAVING FRICTION-REDUCING TEXTURED SURFACES AND METHODS OF MANUFACTURING SAME - Metal sheets and plates having friction-reducing textured surfaces and methods of manufacturing these metal sheets and plates are disclosed herein. In an embodiment, there is provided a transportation vessel that includes at least one metal product having at least one surface that is substantially grooved, wherein the substantially grooved surface forms a riblet topography, the riblet topography including a multiplicity of adjacent permanently rolled longitudinal riblets running along at least a part of the surface, and wherein the riblet topography is coated with at least one coating sufficiently designed and applied to preserve the riblet topography. In an embodiment, the multiplicity of adjacent permanently rolled longitudinal riblets results in a friction-reducing textured surface. In an embodiment, metal product is used in fabricating at least a portion of an aircraft. In an embodiment, metal product is used in fabricating at least a portion of a rotor blade. | 05-27-2010 |
20120227453 | METAL SHEETS AND PLATES HAVING FRICTION-REDUCING TEXTURED SURFACES AND METHODS OF MANUFACTURING SAME - Metal sheets and plates having friction-reducing textured surfaces and methods of manufacturing these metal sheets and plates are disclosed herein. In an embodiment, there is provided a transportation vessel that includes at least one metal product having at least one surface that is substantially grooved, wherein the substantially grooved surface forms a riblet topography, the riblet topography including a multiplicity of adjacent permanently rolled longitudinal riblets running along at least a part of the surface, and wherein the riblet topography is coated with at least one coating sufficiently designed and applied to preserve the riblet topography. In an embodiment, the multiplicity of adjacent permanently rolled longitudinal riblets results in a friction-reducing textured surface. In an embodiment, metal product is used in fabricating at least a portion of an aircraft. In an embodiment, metal product is used in fabricating at least a portion of a rotor blade. | 09-13-2012 |
20140248453 | METAL SHEETS AND PLATES HAVING FRICTION-REDUCING TEXTURED SURFACES AND METHODS OF MANUFACTURING SAME - Metal sheets and plates having friction-reducing textured surfaces and methods of manufacturing these metal sheets and plates are disclosed herein. In an embodiment, there is provided a transportation vessel that includes at least one metal product having at least one surface that is substantially grooved, wherein the substantially grooved surface forms a riblet topography, the riblet topography including a multiplicity of adjacent permanently rolled longitudinal riblets running along at least a part of the surface, and wherein the riblet topography is coated with at least one coating sufficiently designed and applied to preserve the riblet topography. In an embodiment, the multiplicity of adjacent permanently rolled longitudinal riblets results in a friction-reducing textured surface. In an embodiment, metal product is used in fabricating at least a portion of an aircraft. In an embodiment, metal product is used in fabricating at least a portion of a rotor blade. | 09-04-2014 |
Patent application number | Description | Published |
20090278409 | MONOLITHICALLY INTEGRATED LIGHT-ACTIVATED THYRISTOR AND METHOD - A monolithically integrated light-activated thyristor in an n-p-n-p-n-p sequence consists of a four-layered thyristor structure and an embedded back-biased PN junction structure as a turn-off switching diode. The turn-off switching diode is formed through structured doping processes and/or depositions on a single semiconductor wafer so that it is integrated monolithically without any external device or semiconductor materials. The thyristor can be switching on and off optically by two discrete light beams illuminated on separated openings of electrodes on the top surface of a semiconductor body. The carrier injection of the turning on process is achieved by illuminating the bulk of the thyristor with a high level light through the first aperture over the cathode to create high density charge carriers serving as the gate current injection and to electrically short the emitter and drift layer. The switching off of the thyristor is achieved by shorting the base layer and the cathode layer by illuminating the embedded back-biased PN junction of the TURN-OFF switching diode. The patterned doping profile and the interconnect between the emitter and the base region of the light activated thyristor makes possible a monolithic and/or planar integrated fabrication of the semiconductor switching device on a single semiconductor wafer via the standard semiconductor fabrication process. | 11-12-2009 |
20110025135 | MONOLITHICALLY INTEGRATED LIGHT-ACTIVED THYRISTOR AND METHOD - A monolithically integrated light-activated thyristor, in an n-p-n-p-n-p sequence consists of a four-layered thyristor structure and an embedded back-biased PN junction structure as a turn-off switching diode. The turn-off switching diode is formed through structured doping processes and/or depositions on a single semiconductor wafer so that it is integrated monolithically without any external device or semiconductor materials. The thyristor can be switching on and off optically by two discrete light beams illuminated on separated openings of electrodes on the top surface of a semiconductor body. The carrier injection of the turning on process is achieved by illuminating the bulk of the thyristor with a high level light through the first aperture over the cathode to create high density charge carriers serving as the gate current injection and to electrically short the emitter and drift layer. The switching off of the thyristor is achieved by shorting the base layer and the cathode layer by illuminating the embedded back-biased PN junction of the TURN-OFF switching diode. The patterned doping profile and the interconnect between the emitter and the base region of the light activated thyristor makes possible a monolithic and/or planar integrated fabrication of the semiconductor switching device on a single semiconductor wafer via the standard semiconductor fabrication process. | 02-03-2011 |
20110233380 | MONOLITHICALLY INTEGRATED LIGHT-ACTIVED THYRISTOR AND METHOD - A monolithically integrated light-activated thyristor in an n-p-n-p-n-p sequence consists of a four-layered thyristor structure and an embedded back-biased PN junction structure as a turn-off switching diode. The turn-off switching diode is formed through structured doping processes and/or depositions on a single semiconductor wafer so that it is integrated monolithically without any external device or semiconducter materials. The thyristor can be switching on and off optically by two discrete light beams illuminated on separated openings of electrodes on the top surface of a semiconductor body. The carrier injection of the turning on process is achieved by illuminating the bulk of the thyristor with a high level light through the first aperture over the cathode to create high density charge carriers serving as the gate current injection and to electrically short the emitter and drift layer. The switching off of the thyristor is achieved by shorting the base layer and the cathode layer by illuminating the embedded back-biased PN junction of the TURN-OFF switching diode. The patterned doping profile and the interconnect between the emitter and the base region of the light activated thyristor makes possible a monolithic and/or plantar integrated fabrication of the semiconductor switching device on a single semiconductor wafer via the standard semiconductor fabrication process. | 09-29-2011 |
20120288232 | METHODS FOR LIGHT COUPLING INTO POWER SEMICONDUCTORS - Disclosed is a method of coupling light into a power semiconductor device having a semiconductor structure with two or more layers. The power semiconductor device has multiple cells of functionally identical units linked by multiple interconnects. In each device unit, a patterned electrode layer is disposed on the surface of the semiconductor structure. The method includes illuminating the power semiconductor device by directing a light from a light source through the patterned electrode layer to form an enhanced light coupling with the semiconductor structure. The patterned electrode layer is configured to have a micron scaled grid pattern having multiple metal grids and aperture openings that is based on a distributed resistance model having two characteristic current decay lengths. | 11-15-2012 |
20140021508 | Thyristor-Based, Dual-Polarity Blocking Photo-Conductive Semiconductor Switch (PCSS) For Short Pulse Switching And Methods - A system and method utilizing thyristor-based Photo-Conductive Semiconductor Switches (PCSS) for short pulse switching in high power microwave and/or broadband electromagnetic pulse generation is disclosed. The PCSS consists of thyristor-type NPNP structure having multiple emitter regions enclosed by the base region and multiple emitter shorts to divert leakage currents for voltage holding. The PCSS also includes an optical aperture comprised of patterned metallic grids for light illumination and current collection. The device structure is so constructed that there is only one single bevel around the peripheral. The thyristor-based PCSS have dual polarities of voltage blocking and have better efficiency for light requirement to operate at longer pulse duration compared to diode-based and bulk-semiconductor-based PCSS. | 01-23-2014 |