Source: http://www.google.com/patents/US8193848?dq=6,240,376
Timestamp: 2015-03-04 23:37:10
Document Index: 299447023

Matched Legal Cases: ['Application No. 200780029460', 'Application No. 07', 'application No. 09163424', 'application No. 09177558', 'Application No. 07112298', 'art 2']

Patent US8193848 - Power switching devices having controllable surge current capabilities - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsSemiconductor switching devices include a wide band-gap power transistor, a wide band-gap surge current transistor that coupled in parallel to the power transistor, and a wide band-gap driver transistor that is configured to drive the surge current transistor. Substantially all of the on-state output...http://www.google.com/patents/US8193848?utm_source=gb-gplus-sharePatent US8193848 - Power switching devices having controllable surge current capabilitiesAdvanced Patent SearchPublication numberUS8193848 B2Publication typeGrantApplication numberUS 12/610,582Publication dateJun 5, 2012Filing dateNov 2, 2009Priority dateJun 2, 2009Also published asEP2438618A1, US20100301929, WO2010141238A1Publication number12610582, 610582, US 8193848 B2, US 8193848B2, US-B2-8193848, US8193848 B2, US8193848B2InventorsQingchun Zhang, James Theodore Richmond, Anant K. Agarwal, Sei-Hyung RyuOriginal AssigneeCree, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (100), Non-Patent Citations (150), Referenced by (2), Classifications (28), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetPower switching devices having controllable surge current capabilities
Power Metal Oxide Semiconductor Field Effect Transistors (�MOSFET�) are a well known type of semiconductor transistor that may be used as a switching device in high power applications. A power MOSFET may be turned on or off by applying a gate bias voltage to a gate electrode of the device. When a power MOSFET is turned on (i.e., it is in its �on-state�), current is conducted through a channel of the MOSFET. When the bias voltage is removed from the gate electrode (or reduced below a threshold level), the current ceases to conduct through the channel. By way of example, an n-type MOSFET turns on when a gate bias voltage is applied that is sufficient to create a conductive n-type inversion layer in a p-type channel region of the device. This n-type inversion layer electrically connects the n-type source and drain regions of the MOSFET, thereby allowing for majority carrier conduction therebetween.
Pursuant to embodiments of the present invention, semiconductor switching devices are provided that include a power transistor, a surge current transistor that is coupled in parallel to the power transistor and a driver transistor that is configured to drive the surge current transistor, These devices are configured so that, in their on-state, substantially all of the output current of the device flows through the channel of the power transistor when the voltage across the channel is within a first voltage range, whereas the output current flows through both the surge current transistor and the channel of the power transistor when the voltage across the channel is within a second, higher, voltage range. The surge current transistor may comprise a bipolar junction transistor (�BJT�), the power transistor may comprise a power MOSFET, and the driver transistor may comprise a driver MOSFET. The BJT, the power MOSFET and the driver MOSFET may each comprise a silicon carbide based device.
FIG. 1 is a circuit diagram of a controllable surge MOSFET (�CST�) according to embodiments of the present invention.
The invention is described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. It will be understood that when an element or layer is referred to as being �on�, �connected to� or �coupled to� another element or layer, it can be directly on, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being �directly on,� �directly connected to� or �directly coupled to� another element or layer, there are no intervening elements or layers present. As used herein, the term �and/or� includes any and all combinations of one or more of the associated listed items. Like numbers refer to like elements throughout.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3439189Dec 28, 1965Apr 15, 1969Teletype CorpGated switching circuit comprising parallel combination of latching and shunt switches series-connected with input-output control meansUS3629011Sep 6, 1968Dec 21, 1971Matsushita Electric Ind Co LtdMethod for diffusing an impurity substance into silicon carbideUS3924024Apr 2, 1973Dec 2, 1975Ncr CoProcess for fabricating MNOS non-volatile memoriesUS4160920Jul 15, 1977Jul 10, 1979Bicosa Societe De RecherchesBistable element and a switch circuit comprising such a bistable elementUS4242690Jun 6, 1978Dec 30, 1980General Electric CompanyHigh breakdown voltage semiconductor deviceUS4466172Jul 27, 1981Aug 21, 1984American Microsystems, Inc.Method for fabricating MOS device with self-aligned contactsUS4581542Nov 14, 1983Apr 8, 1986General Electric CompanyDriver circuits for emitter switch gate turn-off SCR devicesUS4644637Dec 30, 1983Feb 24, 1987General Electric CompanyMethod of making an insulated-gate semiconductor device with improved shorting regionUS4811065Jun 11, 1987Mar 7, 1989Siliconix IncorporatedPower DMOS transistor with high speed body diodeUS4875083Oct 26, 1987Oct 17, 1989North Carolina State UniversityReduced electrical resistance and leakage; high temperature, radiation operationUS4927772May 30, 1989May 22, 1990General Electric CompanyMethod of making high breakdown voltage semiconductor deviceUS4945394Oct 26, 1987Jul 31, 1990North Carolina State UniversityBipolar junction transistor on silicon carbideUS4946547Oct 13, 1989Aug 7, 1990Cree Research, Inc.Method of preparing silicon carbide surfaces for crystal growthUS5011549Oct 16, 1989Apr 30, 1991North Carolina State UniversityVapor deposition, smoothnessUS5028977 *Jun 16, 1989Jul 2, 1991Massachusetts Institute Of TechnologyMerged bipolar and insulated gate transistorsUS5032888Jul 23, 1990Jul 16, 1991Fuji Electric Co., Ltd.Conductivity modulation buried gate trench type MOSFETUS5111253Aug 28, 1990May 5, 1992General Electric CompanyMulticellular FET having a Schottky diode merged therewithUS5155289Jul 1, 1991Oct 13, 1992General AtomicsFor controlling a source of direct currentUS5170231May 24, 1991Dec 8, 1992Sharp Kabushiki KaishaFirst contact between channel formation layer and drain region exhibits different electric characteristics from second contact between channel and source region; Schottky junctionUS5170455Oct 30, 1991Dec 8, 1992At&T Bell LaboratoriesOptical connective deviceUS5184199Jun 5, 1990Feb 2, 1993Sharp Kabushiki KaishaSilicon carbide semiconductor deviceUS5192987May 17, 1991Mar 9, 1993Apa Optics, Inc.Gallium nitride and aluminum gallium nitride junction layersUS5200022Oct 3, 1990Apr 6, 1993Cree Research, Inc.Method of improving mechanically prepared substrate surfaces of alpha silicon carbide for deposition of beta silicon carbide thereon and resulting productUS5210051Jun 5, 1991May 11, 1993Cree Research, Inc.P-n junctionsUS5270554Jun 14, 1991Dec 14, 1993Cree Research, Inc.High power high frequency metal-semiconductor field-effect transistor formed in silicon carbideUS5292501Apr 26, 1993Mar 8, 1994Degenhardt Charles RUse of a carboxy-substituted polymer to inhibit plaque formation without tooth stainingUS5296395Mar 3, 1993Mar 22, 1994Apa Optics, Inc.Forming a multilayer element with gallium nitride and aluminum gallium nitride layersUS5348895Jun 2, 1993Sep 20, 1994Texas Instruments IncorporatedLDMOS transistor with self-aligned source/backgate and photo-aligned gateUS5371383May 14, 1993Dec 6, 1994Kobe Steel Usa Inc.Highly oriented diamond film field-effect transistorUS5384270Nov 10, 1993Jan 24, 1995Fuji Electric Co., Ltd.Method of producing silicon carbide MOSFETUS5385855Feb 24, 1994Jan 31, 1995General Electric CompanyFabrication of silicon carbide integrated circuitsUS5393993Dec 13, 1993Feb 28, 1995Cree Research, Inc.Buffer structure between silicon carbide and gallium nitride and resulting semiconductor devicesUS5393999Jun 9, 1994Feb 28, 1995Texas Instruments IncorporatedSiC power MOSFET device structureUS5396085Dec 28, 1993Mar 7, 1995North Carolina State UniversitySilicon carbide switching device with rectifying-gateUS5399887May 3, 1994Mar 21, 1995Motorola, Inc.Semiconductor deviceUS5459107Jun 5, 1992Oct 17, 1995Cree Research, Inc.Method of obtaining high quality silicon dioxide passivation on silicon carbide and resulting passivated structuresUS5468654Jul 22, 1991Nov 21, 1995Mitsubishi Denki Kabushiki KaishaMethod of manufacturing an insulated gate bipolar transistorUS5473176Aug 31, 1994Dec 5, 1995Kabushiki Kaisha ToshibaVertical insulated gate transistor and method of manufactureUS5479316Aug 24, 1993Dec 26, 1995Analog Devices, Inc.Integrated circuit metal-oxide-metal capacitor and method of making sameUS5488236May 26, 1994Jan 30, 1996North Carolina State UniversityLatch-up resistant bipolar transistor with trench IGFET and buried collectorUS5506421Nov 24, 1992Apr 9, 1996Cree Research, Inc.Power MOSFET in silicon carbideUS5510281Mar 20, 1995Apr 23, 1996General Electric CompanyMethod of fabricating a self-aligned DMOS transistor device using SiC and spacersUS5510630Oct 18, 1993Apr 23, 1996Westinghouse Electric CorporationNon-volatile random access memory cell constructed of silicon carbideUS5523589Sep 20, 1994Jun 4, 1996Cree Research, Inc.Conductive silicon carbide substrate; ohmic contact; conductive buffer layerUS5539217Aug 9, 1993Jul 23, 1996Cree Research, Inc.Silicon carbide thyristorUS5545905Apr 18, 1994Aug 13, 1996Toyo Denki Seizo Kabushiki KaishaStatic induction semiconductor device with a static induction schottky shorted structureUS5587870Jun 22, 1994Dec 24, 1996Research Foundation Of State University Of New YorkNanocrystalline layer thin film capacitorsUS5629531Dec 9, 1994May 13, 1997Cree Research, Inc.MicroelectronicsUS5710059Apr 24, 1996Jan 20, 1998Abb Research Ltd.Implanting dopants, annealing at high temperatureUS5726463Aug 7, 1992Mar 10, 1998General Electric CompanySilicon carbide MOSFET having self-aligned gate structureUS5726469Jul 19, 1995Mar 10, 1998University Of Elec. Sci. & Tech. Of ChinaSurface voltage sustaining structure for semiconductor devicesUS5734180Jun 5, 1996Mar 31, 1998Texas Instruments IncorporatedHigh-performance high-voltage device structuresUS5739564Jun 1, 1995Apr 14, 1998Motorola, Inc.Semiconductor device having a static-random-access memory cellUS5763905Jul 9, 1996Jun 9, 1998Abb Research Ltd.Semiconductor device having a passivation layerUS5776837Nov 19, 1996Jul 7, 1998Cree Research, Inc.Method of obtaining high quality silicon dioxide passivation on silicon carbide and resulting passivated structuresUS5804483Aug 6, 1996Sep 8, 1998Abb Research Ltd.Heating to diffuse p-type dopants into silicon carbide layer which is doped with n-type dopantsUS5814859Nov 15, 1995Sep 29, 1998General Electric CompanySemiconductor deviceUS5831288Sep 29, 1997Nov 3, 1998Cree Research, Inc.Silicon carbide metal-insulator semiconductor field effect transistorUS5837572Jan 10, 1997Nov 17, 1998Advanced Micro Devices, Inc.CMOS integrated circuit formed by using removable spacers to produce asymmetrical NMOS junctions before asymmetrical PMOS junctions for optimizing thermal diffusivity of dopants implanted thereinUS5851908May 8, 1995Dec 22, 1998Abb Research Ltd.Method for introduction of an impurity dopant in SiC, a semiconductor device formed by the method and a use of highly doped amorphous layer as a source for dopant diffusion into SiCUS5877041Jun 30, 1997Mar 2, 1999Harris CorporationSelf-aligned power field effect transistor in silicon carbideUS5877045Apr 10, 1996Mar 2, 1999Lsi Logic CorporationMethod of forming a planar surface during multi-layer interconnect formation by a laser-assisted dielectric depositionUS5885870Jul 2, 1997Mar 23, 1999Motorola, Inc.Method for forming a semiconductor device having a nitrided oxide dielectric layerUS5914500Mar 20, 1997Jun 22, 1999Abb Research Ltd.Junction termination for SiC Schottky diodeUS5917203Mar 31, 1997Jun 29, 1999Motorola, Inc.Lateral gate vertical drift region transistorUS5939763Sep 5, 1996Aug 17, 1999Advanced Micro Devices, Inc.Ultrathin oxynitride structure and process for VLSI applicationsUS5960289Jun 22, 1998Sep 28, 1999Motorola, Inc.Method for making a dual-thickness gate oxide layer using a nitride/oxide composite regionUS5969378Jul 10, 1997Oct 19, 1999Cree Research, Inc.Latch-up free power UMOS-bipolar transistorUS5972801Nov 8, 1995Oct 26, 1999Cree Research, Inc.Forming oxide layer on prepared silicon carbide layer; exposing to oxidizing gas to densify oxide layer and improve interface between oxide layer and underlying silicon carbide layerUS5976936Jul 15, 1997Nov 2, 1999Denso CorporationMultilyer laminate; forming trench; forming barrier electrodeUS5977605Oct 20, 1997Nov 2, 1999Asea Brown Boveri AbSiC Semiconductor device comprising a pn Junction with a voltage absorbing edgeUS6020600Sep 26, 1997Feb 1, 2000Nippondenso Co., Ltd.Silicon carbide semiconductor device with trenchUS6025233May 20, 1999Feb 15, 2000Ngk Insulators, Ltd.Method of manufacturing a semiconductor deviceUS6025608Nov 18, 1997Feb 15, 2000Abb Research Ltd.Silicon nitride subbing layerUS6028012Dec 4, 1996Feb 22, 2000Yale UniversityProcess for forming a gate-quality insulating layer on a silicon carbide substrateUS6040237Oct 23, 1997Mar 21, 2000Abb Research Ltd.Fabrication of a SiC semiconductor device comprising a pn junction with a voltage absorbing edgeUS6048766Oct 14, 1998Apr 11, 2000Advanced Micro DevicesFlash memory device having high permittivity stacked dielectric and fabrication thereofUS6054352Feb 20, 1998Apr 25, 2000Fuji Electric Co., Ltd.Method of manufacturing a silicon carbide vertical MOSFETUS6054728Apr 3, 1998Apr 25, 2000Fuji Electric Co., Ltd.Insulated gate thyristorUS6063698Jun 30, 1997May 16, 2000Motorola, Inc.Method for manufacturing a high dielectric constant gate oxide for use in semiconductor integrated circuitsUS6083814Sep 3, 1998Jul 4, 2000Abb Research Ltd.Method for producing a pn-junction for a semiconductor device of SiCUS6096607Aug 17, 1998Aug 1, 2000Fuji Electric Co., Ltd.Method for manufacturing silicon carbide semiconductor deviceUS6100169Jun 8, 1998Aug 8, 2000Cree, Inc.Methods of fabricating silicon carbide power devices by controlled annealingUS6104043Feb 20, 1997Aug 15, 2000Abb Research Ltd.Schottky diode of SiC and a method for production thereofUS6107142Jun 8, 1998Aug 22, 2000Cree Research, Inc.Self-aligned methods of fabricating silicon carbide power devices by implantation and lateral diffusionUS6117735Jan 5, 1999Sep 12, 2000Fuji Electric Co., Ltd.Silicon carbide vertical FET and method for manufacturing the sameUS6121633May 21, 1998Sep 19, 2000Cree Research, Inc.Latch-up free power MOS-bipolar transistorUS6133587Feb 13, 1998Oct 17, 2000Denso CorporationSilicon carbide semiconductor device and process for manufacturing sameUS6136727Dec 18, 1998Oct 24, 2000Fuji Eletric Co., Ltd.Preheating a silicon carbide substrate in an atmosphere comprising hydrogen, then oxidation to form silicon dioxide dielectric layerUS6136728Jan 5, 1996Oct 24, 2000Yale UniversityAnnealing the dielectric layer in a water vapor atmosphere to improve the electrical propertiesUS6165822Jan 4, 1999Dec 26, 2000Denso CorporationSilicon carbide semiconductor device and method of manufacturing the sameUS6180958Feb 7, 1997Jan 30, 2001James Albert Cooper, Jr.Structure for increasing the maximum voltage of silicon carbide power transistorsUS6190973Dec 18, 1998Feb 20, 2001Zilog Inc.Method of fabricating a high quality thin oxideUS6204135Jan 31, 2000Mar 20, 2001Siced Electronics Development Gmbh & Co KgMethod for patterning semiconductors with high precision, good homogeneity and reproducibilityUS6204203Oct 14, 1998Mar 20, 2001Applied Materials, Inc.Post deposition treatment of dielectric films for interface controlUS6211035Sep 9, 1999Apr 3, 2001Texas Instruments IncorporatedIntegrated circuit and methodUS6218254Sep 22, 1999Apr 17, 2001Cree Research, Inc.Method of fabricating a self-aligned bipolar junction transistor in silicon carbide and resulting devicesUS6218680May 18, 1999Apr 17, 2001Cree, Inc.Semi-insulating silicon carbide without vanadium dominationUS6221688Aug 30, 1999Apr 24, 2001Fuji Electric Co. Ltd.Diode and method for manufacturing the sameUSRE34861Oct 9, 1990Feb 14, 1995North Carolina State UniversitySublimation of silicon carbide to produce large, device quality single crystals of silicon carbide* Cited by examinerNon-Patent CitationsReference1"Insulated-gate bipolar transistor." Wikipedia, the Free Encyclopedia. Web. Jun. 21, 2010. http://en.wikipedia.org.2A.K. Agarwal, J.B. Casady, L.B. Rowland, W.F. Valek, and C.D. Brandt, "1400 V 4H-SiC Power MOSFET's," Materials Science Forum vols. 264-268, pp. 989-992, 1998.3A.K. Agarwal, J.B. Casady, L.B. Rowland, W.F. Valek, M.H. White, and C.D. Brandt, "1.1 kV 4H-SiC Power UMOSFET's," IEEE Electron Device Letters, vol. 18, No. 12, pp. 586-588, Dec. 1997.4A.K. Agarwal, N.S. Saks, S.S. Mani, V.S. Hegde and P.A. Sanger, "Investigation of Lateral RESURF, 6H-SiC MOSFETs," Materials Science Forum, vols. 338-342, pp. 1307-1310, 2000.5A.K. Agarwal, S. Seshadri, and L.B. Rowland, "Temperature Dependence of Fowler-Nordheim Current in 6H- and 4H-SiC MOS Capacitors," IEEE Electron Device Letters, vol. 18, No. 12, Dec. 1997, pp. 592-594.6A.V. Suvorov, L.A. Lipkin, G.M. Johnson, R. Singh and J.W. Palmour, "4H-SiC Self-Aligned Implant-Diffused Structure for Power DMOSFETs," Materials Science Forum vols. 338-342, pp. 1275-1278, 2000.7Agarwal et al. "A Critical Look at the Performance Advantages and Limitations of 4H-SiC Power UMOSFET Structures," 1996 IEEE ISPSD and IC's Proc. , May 20-23, 1996, pp. 119-122.8Asano et al., "Dynamic Characteristics of 6.2kV High Voltage 4H-SiC pn Diode with Low Loss", Transactions of the Institute of Electrical Engineers of Japan, Part D Inst. Electr. Eng. Japan, vol. 123D, No. 5, May 2003, pp. 623-627, XP8124184.9Ayalew, T, "Dissertation of Tesfaye Ayalew", Section 4.4.3.1 MPS Diode Structure, SiC Semiconductor Devices Technology, Modeling, and Simulation, 2006.10Baliga "Insulated Gate Biopolar Transistor" Power Semiconductor Devices. PWS Publishing Company, Boston, MA. 426-502 (1996).11Baliga "Power MOSFET" Power Semiconductor Devices. PWS Publishing Company, Boston, MA 335-425 (1996).12Baliga, Power Semiconductor Devices, Chapter 7, PWS Publishing, 1996.13Bhatnagar et al. "Comparison of 6H-SiC, 3C-SiC, and Si for Power Devices," IEEE Transactions on Electron Devices, vol. 40, No. 3, Mar. 1993, pp. 645-655.14Buchner et al., "Laser Recrystallization of Polysilicon for Improved Device Quality", Springer Proceedings in Physics, vol. 35, Polycrystalline Semiconductors, pp. 289-294.15Capano, M.A., et al., Ionization Energies and Electron Mobilities in Phosphorus-and Nitrogen-Implanted 4H-Silicon Carbide, IEEE ICSCRM Conference 1999, Research Triangle Park, North Carolina (Oct. 10-13, 1999).16Capano, M.A., et al., Ionization Energies and Electron Mobilities in Phosphorus�and Nitrogen-Implanted 4H-Silicon Carbide, IEEE ICSCRM Conference 1999, Research Triangle Park, North Carolina (Oct. 10-13, 1999).17Chakraborty et al. "Interface Properties of N2O-annealed SiO2SiC system," Proceedings IEEE Hong Kong Electron Devices Meeting. Jun. 24, 2000, pp. 108-111.18Chang et al. "Observation of a Non-stoichiometric Layer at the Silicon Dioxide-Silicon Carbide Interface: Effect of Oxidation Temperature and Post-Oxidation Processing Conditions," Mat. Res. Soc. Symp. Proc. vol. 640, 2001.19Chang et al. "Observation of a Non-stoichiometric Layer at the Silicon Dioxide�Silicon Carbide Interface: Effect of Oxidation Temperature and Post-Oxidation Processing Conditions," Mat. Res. Soc. Symp. Proc. vol. 640, 2001.20Chen et al. "Theoretical Analysis of Current Crowding Effect in Metal/AIGaN/GaN Schottky Diodes and Its Reduction by Using Polysilicon in Anode,"Chin. Phys. Lett., vol. 24, No. 7 (2007) pp. 2112-2114.21Chinese Office Action dated Jan. 22, 2010, corresponding to Chinese Patent Application No. 200780029460.5, 7 pages.22Cho et al. "Improvement of charge trapping by hydrogen post-oxidation annealing in gate oxide of 4H-SiC methel-oxide-semiconductor capacitors," Applied Physics Letters. vol. 77, No. 8, pp. 1215-1217 (Aug. 21, 2000).23Chung et al. "Effects of anneals in ammonia on the interface trap density near athe band edges in 4H-silicon carbide metal-oxide-semiconductor capacitors," Applied Physics Letters. vol. 77, Nov. 27, 2000, pp. 3601-3603.24Chung et al., "The Effect of Si:C Source Ratio on SiO2/SiC Interface State Density for Nitrogen Doped 4H and 6H-SiC," Materials Science Forum. (2000) vols. 338-342, pp. 1097-1100.25D. Alok, E. Arnold, and R. Egloff, "Process Dependence of Inversion Layer Mobility in 4H-SiC Devices," Materials Science Forum, vols. 338-342, pp. 1077-1080, 2000.26Dahlquist et al. "A 2.8kV, Forward Drop JBS Diode with Low Leakage," Materials Science Forum, vols. 338-342, (2000) pp. 1179-1182.27Das, Mrinal K. Graduate thesis entitled, Fundamental Studies of the Silicon Carbide MOS Structure. Purdue University, 1999.28Dastidar, Sujoyita, A Study of P-Type Activation in Silicon Carbide, Thesis (Purdue University, May 1998).29De Meo et al., "Thermal Oxidation of SiC in N2O", J. Electrochem. Soc., vol. 141, 1994, pp. L150-L152.30del Prado et al. "Full Composition Range Silicon Oxynitride Films Deposited by ECR-PECVD at Room Temperatures," Thin Solid Films. vol. 343-344 (1999) p. 437-440.31Dimitrijev et al., "Nitridation of Silicon-Dioxide Films Grown on 6H Silicon Carbide", IEEE Electronic Device Letters, vol. 18, No. 5, May 5, 1997, pp. 175-177.32European Communication Corresponding to Application No. 07 112 298.0; Dated: Jan. 16, 2012; 7 pages.33European Search Report for corresponding EP patent application No. 09163424.6 dated Apr. 9, 2010.34European Search Report for corresponding EP patent application No. 09177558.5 dated Feb. 22, 2010.35European Search Report; Application No. EP07120038; Jun. 16, 2008.36Extended European Search Report (12 pages) corresponding to European Application No. 07112298; Dated Feb. 18, 2009.37Fisher, C.A. et al., "The performance of high-voltage field relieved Schottky barrier diodes", IEE Proceedings, vol. 132:6, Pt. I, pp. 257-260 (Dec. 1985).38Fukuda et al. "Improvement of SiO2/4H-SiC Interface by Using High Temperature Hydrogen Annealing at 1000� C," Extended Abstracts of the International Conference on Solid State Devices and Materials. Japan Society of Applied Physics, Tokyo, Japan, Sep. 1998.39Fukuda et al. "Improvement of SiO2/4H-SiC Interface Using High-Temperature Hydrogen Annealing at Low Pressure and Vacuum Annealing," Jpn J. Appl. Phys. vol. 38, Apr. 1999, pp. 2306-2309.40G.Y. Chung, C.C. Tin, J.R. Williams, K. McDonald, M. Di Ventra, S.T. Pantelides, L.C. Feldman, and R.A. Weller, "Effect of nitric oxide annealing on the interface trap densities near the band edges in the 4H polytype of silicon carbide," Applied Physics Letters, vol. 76, No. 13, pp. 1713-1715, Mar. 2000.41G.Y. Chung, C.C. Tin, J.R. Williams, K. McDonald, R.K. Chanana, R.A. Weller, S.T. Pantelides, L.C. Feldman, O.W. Holland, M.K. Das, and J.W. Palmour, "Improved Inversion Channel Mobility for 4H-SiC MOSETs Following High Temperature Anneals in Nitric Oxide," IEEE Electron Device Letters, vol. 22, No. 4, Apr. 2001.42H.F. Li, S. Dimitrijev, H.B. Harrison, D. Sweatman, P.T. Tanner. "Improving SiO2 Grown on P-Type 4H-SiC by NO Annealing," Materials Science Forum. vols. 264-268 (1998) pp. 869-872.43http://www.elec.gla.ac.uk; The Insulated Gate Bipolar Transistor (IGBT); Feb. 14, 2007.44Hubel, K, "Hybrid design improves diode robustness and boosts efficiency," Compoundsemiconductor.net, 2006.45Hull et al., "Drift-Free 10-kV, 20-A 4H-SiC PiN Diodes," Journal of Electronic Materials, vol. 34, No. 4, 2005, pp. 341-344.46International Preliminary Report on Patentability (9 pages) corresponding to International Application No. PCT/US2007/010192; Mailing Date: Sep. 23, 2008.47International Preliminary Report on Patentability Corresponding to International Application No. PCT/US2010/034502; Date of Mailing: Jan. 26, 2012; 12 pages.48International Search Report and the Written Opinion of the International Searching Authority Corresponding to International Application No. PCT/US2011/027383; Date of Mailing: May 20, 2011; 8 Pages.49International Search Report and the Written Opinion of the International Searching Authority Corresponding to International Application No. PCT/US2011/031150; Date of Mailing: Jun. 20, 2011; 10 Pages.50International Search Report and Written Opinion (13 pages) corresponding to International Application No. PCT/US2008/010538; Mailing Date: Dec. 22, 2008.51International Search Report and Written Opinion (14 pages) corresponding to International Application No. PCT/US2009/065251; Mailing Date: Jun. 1, 2010.52International Search Report and Written Opinion (14 pages) corresponding to International Application No. PCT/US2010/020071; Mailing Date: Mar. 26, 2010.53International Search Report and Written Opinion (16 pages) corresponding to International Application No. PCT/US2009/003089; Mailing Date: Aug. 20, 2009.54International Search Report and Written Opinion for corresponding International Application No. PCT/US2004/004982, dated Jul. 22, 2004.55International Search Report and Written Opinion for PCT/US2007/014139; Feb. 4, 2008.56International Search Report and Written Opinion for PCT/US2010/025053 mailed on Jul. 2, 2010.57International Search Report and Written Opinion, International Application No. PCT/US2009/000734, Apr. 23, 2009.58International Search Report for PCT/US01/30715.59International Search Report for PCT/US01/42414, dated Apr. 23, 2002.60International Search Report for PCT/US02/11691 dated Dec. 4, 2002.61International Search Report, PCT/US2008/008574, Sep. 26, 2008.62Invitation to Pay Additional Fees for PCT/US2007/010192; Oct. 29, 2007.63Invitation to Pay Additional Fees for PCT/US2010/025053 mailed on May 3, 2010.64J. T. Richmond, S. Ryu, A.K. Agarwal and J.W. Palmour, "Hybrid 4H-SiC MOS Gated Transistor (MGT)" (admitted prior art).65J. Tan, J.A. Cooper, Jr., and Mr. R. Melloch, "High-Voltage Accumulation-Layer UMOSFETs in 4H-SiC," IEEE Electron Device Letters, vol. 19, No. 12, pp. 487-489, Dec. 1998.66J.B. Casady, A.K. Agarwal, L.B. Rowland, W.F. Valek, and C.D. Brandt, "900 V DMOS and 1100 V UMOS 4H-SiC Power FETs," IEEE Device Research Conference, Ft. Collins, CO Jun. 23-25, 1997.67J.N. Shenoy, J.A. Cooper and M.R. Meelock, "High-Voltage Double-Implanted Power MOSFETs in 6H-SiC," IEEE Electron Device Letters, vol. 18, No. 3, pp. 93-95, Mar. 1997.68J.T. Richmond, S. Ryu, A.K. Agarwal and J.W. Palmour, "Hybrid 4H-SiC MOS Gated Transistor (MGT)" (admitted prior art).69Jamet, et al. "Physical properties of N2O and NO-nitrided gate oxides grown on 4H SiC," Applied Physics Letters. vol. 79, No. 3, Jul. 16, 2001, pp. 323-325.70K. Ueno and Tadaaki Oikawa, "Counter-Doped MOSFET's of 4H-SiC," IEEE Electron Device Letters, vol. 20, No. 12, pp. 624-626, Dec. 1999.71K. Ueno, R. Asai, and T. Tsuji. "4H-SiC MOSFET's Utilizing the H2 Surface Cleaning Technique." IEEE Electron Device Letters, vol. 19, No. 7, Jul. 1998, pp. 244-246.72Katsunori Ueno, Tatsue Urushidani, Kouicki Hahimoto, and Yasukazu Seki. "The Guard-Ring Termination for the High-Voltage SiC Schottky Barrier Diodes". IEEE Electron Device Letters. vol. 16. No. 7, Jul. 1995, pp. 331-332.73Kinoshita et al., "Guard Ring Assisted RESURF: A New Termination Structure Providing Stable and High Breakdown Voltage for SiC Power Devices,"Tech. Digest of ISPSD '02, pp. 253-256.74Kobayashi et al. "Dielectric Breakdown and Current Conduction of Oxide/Nitride/Oxide Multi-Layer Structures," 1990 IEEE Symposium on VLSI Technology. pp. 119-120.75Krishnaswami et al., "High Temperature characterization of 4H-SiC bipolar junction transistors", Materials Science Forum, Aedermannsfdorf, CH, vol. 527-529, Jan. 1, 2006, pp. 1437-1440, XP009138720, ISSN: 0255-5476.76L.A. Lipkin and J.W. Palmour, "Low interface state density oxides on p-type SiC," Materials Science Forum vols. 264-268, pp. 853-856, 1998.77Lai et al., "Interface Properties of N2O-Annealed NH3-Treated 6H-SiC MOS Capacitor," Proc. 1999 IEEE Hong Kong Electron Devices Meeting, Jun. 26, 1999, pp. 46-49.78Leonhard et al. "Long term stability of gate-oxides on n- and p-type silicon carbide studied by charge injection techniques," Materials Science Engineering, vol. 46, No. 1-3, Apr. 1997, pp. 263-266.79Levinshtein et al., "On the homogeneity of the turn-on process in high voltage 4H-SiC thyristors", Solid-State Electronics, vol. 49, No. 2, Feb. 1, 2005, pp. 233-237, XP004645018 Elsevier Science Publishers, Barking (GB) ISSN: 0038-1101.80Lipkin et al. "Challenges and State-of-the-Art Oxides in SiC," Mat. Res. Soc. Symp. Proc. vol. 640, 2001, pp. 27-29.81Lipkin et al. "Insulator Investigation on SiC for Improved Reliability," IEEE Transactions on Electron Devices. vol. 46, No. 3, Mar. 1999, pp. 525-532.82Losee et al., "Degraded Blocking Performance of 4H-SiC Rectifiers Under High dV/dt Conditions", Proceedings of 17th International Symposium on Power Semiconductor Devices & IC's, 4 pages (May 23-26, 2005). XP010820730.83Losee et al., "High-Voltage 4H-SiC PiN Rectifiers with Single-Implant, Multi-Zone JTE Termination", Power Semiconductor Devices and ICs, 2004 Proceedings. ISPSB '04. The 16th International Symposium on Kitakyushu Int. Conf. Center, Japan May 24-27, 2004, Piscataway, NJ, USA, IEEE, May 24, 2004, pp. 301-304, XP010723398.84M. Das et al., "A 13 kV 4H-SiC N-Channel IGBT with Low Rdiff, on and Fast Switching" presented at: International Conference on Silicon Carbide and Related Materials )ICSCRM), Otsu, Japan, Oct. 14-19, 2007.85M. K. Das, L.A. Lipkin, J.W. Palmour, G.Y. Chung, J.R. Williams, K. McDonald, and L.C. Feldman, "High Mobility 4H-SiC Inversion Mode MOSFETs Using Thermally Grown, NO Annealed SiO2," IEEE Device Research Conference, Denver, CO Jun. 19-21, 2000.86M.A. Capano, S. Ryu, J.A. Cooper, Jr., M.R. Melloch, K. Rottner, S. Karlsson, N. Nordell, A. Powell, and D.E. Walker, Jr., "Surface Roughening in Ion Implanted 4H-Silicon Carbide," Journal of Electronic Materials, vol. 28, No. 3, pp. 214-218, Mar. 1999.87M.K. Das, J.A. Cooper, Jr., M.R. Melloch, and M.A. Capano, "Inversion Channel Mobility in 4H- and 6H-SiC MOSFETs," IEEE Semiconductor Interface Specialists Conference, San Diego, CA, Dec. 3-5, 1998.88Ma et al. "Fixed and trapped charges at oxide-nitride-oxide heterostructure interfaces formed by remote plasma enhanced chemical vapor deposition," J. Vac. Sci. Technol. B. vol. 11, No. 4, Jul./Aug. 1993, pp. 1533-1540.89Mondal et al. "An Integrated 500-V Power DSMOSFET/Antiparallel Rectifier Device with Improved Diode Reverse Recovery Characteristics," IEEE Electron Device Letters, vol. 23, No. 9, Sep. 2002, pp. 562-564.90Motorola Power MOSFET Transistor Databook, 4th edition. Motorola, INc., 1989, pp. 2-5-4-2-5-7.91Mutin, P. Herbert, "Control of the Composition and Structure of Silicon Oxycarbide and Oxynitride Glasses Derived from Polysiloxane Precursors," Journal of Sol-Gel Science and Technology. vol. 14 (1999) pp. 27-38.92Myer-Ward et al. "Turning of Basal Plane Dislocations During Epitaxial Growth on 4 off-axis 4h-SiC" 7th European Conference on Silicon Carbide and Related Materials, Barcelona-Spain, Sep. 7-11, 2008 retrieved from http://ecscrm08.com/invited-presentations.html , retrieved Jul. 1, 2009.93Myer-Ward et al. "Turning of Basal Plane Dislocations During Epitaxial Growth on 4 off-axis 4h-SiC" 7th European Conference on Silicon Carbide and Related Materials, Barcelona-Spain, Sep. 7-11, 2008 retrieved from http://ecscrm08.com/invited�presentations.html , retrieved Jul. 1, 2009.94Notification Concerning Transmittal of International Preliminary Report on Patentability Corresponding to International Application No. PCT/US2010/035709; Date of Mailing: Dec. 15, 2011; 8 Pages.95Notification Concerning Transmittal of International Preliminary Report on Patentability Corresponding to International Application No. PCT/US2010/035713; Date of Mailing: Dec. 15, 2011; 8 Pages.96Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration, International Search Report, Written Opinion of the International Searching Authority, PCT/US2010/026632, Date of Mailing: Oct. 8, 2010, 16 pages.97Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration, International Search Report, Written Opinion of the International Searching Authority, PCT/US2010/035713, Date of Mailing Jul. 27, 2010, 14 pages.98Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration, International Search Report, Written Opinion of the International Searching Authority, PCT/US2010/035713, Date of Mailing: Jul. 27, 2010, 14 pages.99Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration, International Search Report, Written Opinion of the International Searching Authority, PCT/US2010/042075, Date of Mailing: Sep. 24, 2010, 15 pages.100Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration, PCT/US2010/028612, Jun. 17, 2010.101Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration; International Search Report; Written Opinion of the International Searching Authority, PCT/US2008/004239, Mar. 2, 2009.102P.J. Tobin, Y. Okada, S. A. Ajuria, V. Lakhotia, W.A. Feil, and R. I. Hedge, "Furnace formation of silicon oxynitride thin dielectrics in nitrous oxide (N20): The role of nitric oxide (NO)." Journal of Applied Physics. vol. 75, No. 3, Feb. 1, 1994, pp. 1811-1817.103P.M. Shenoy and B.J. Baliga, "The Planar 6H-SiC ACCUFET: A New High-Voltage Power MOSFET Structure," IEEE Electron Device Letters, vol. 18, No. 12, pp. 589-591, Dec. 1997.104P.T. Lai, Supratic Chakraborty, C.L. Chan, and Y.C. Cheng, "Effects of nitridation and annealing on interface properties of thermally oxidized SiO2/SiC metal-oxide-semiconductor system," Applied Physics Letters, vol. 76, No. 25, pp. 3744-3746, Jun. 2000.105Palmour et al. "SiC Device Technology: Remaining Issues," Diamond and Related Materials. vol. 6, 1997, pp. 1400-1404.106Palmour J: "Silicon Carbide npnp Thyristors", NASA Technical Briefs-Electronics and Computers, Dec. 1, 2000, John H. Glenn Research Center, Cleveland, Ohio (US); XP-002567723, http://www.techbriefs.com/component/content/article/7031-lew-16750?tmpl=component&print=1&page= retrieved on Feb. 10, 2010).107Palmour J: "Silicon Carbide npnp Thyristors", NASA Technical Briefs�Electronics and Computers, Dec. 1, 2000, John H. Glenn Research Center, Cleveland, Ohio (US); XP-002567723, http://www.techbriefs.com/component/content/article/7031-lew-16750?tmpl=component&print=1&page= retrieved on Feb. 10, 2010).108Panknin et al., "Electrical and microstructural properties of highly boron-implantation doped 6H-SiC", Journal of Applied Physics 89:6, pp. 3162-3167 (Mar. 15, 2001).109Pantelides et al., "Atomic-Scale Engineering of the SiC-SiO2 Interface," Materials Science Forum. (2000) vols. 338-342, pp. 1133-1136.110Patel, R., et al., Phosphorus-Implanted High-Voltage N.sup.+ P 4H-SiC Junction Rectifiers, Proceedings of 1998 International Symposium on Poer Semiconductor Devices & ICs, pp. 387-390 (Kyoto).111Q. Zhang et al. "12 kV 4H-SiC p-IGBTs with Record Low Specific On-Resistance" presented at: International Conference on Silicon Carbide and Related Materials (ICSCRM), Otsu, Japan, Oct. 14-19, 2007.112R. Sch�rner, P. Friedrichs, D. Peters, and D. Stephani, "Significantly Improved Performance of MOSFETs on Silicon Carbide Using the 15R-SiC Polytype," IEEE Electron Device Letters, vol. 20, No. 5, pp. 241-244, May 1999.113R. Sch�rner, P. Friedrichs, D. Peters, H. Mitlehner, B. Weis, and D. Stephani, "Rugged Power MOSFETs in 6H-SiC with Blocking Capability up to 1800 V," Materials Science Forum vols. 338-342, pp. 1295-1298, 2000.114Ranbir Singh, Sei-Hyung Ryu and John W. Palmour, "High Temperature, High Current, 4H-SiC Accu-DMOSFET," Materials Science Forum vols. 338-342, pp. 1271-1274, 2000.115Rao et al. "Al and N Ion Implantations in 6H-SiC," Silicon Carbide and Related Materials. 1995 Conf, Kyoto, Japan. Published 1996.116Rao et al. "P-N Junction Formation in 6H-SiC by Acceptor Implantation into N-Type Substrate," Nuclear Instruments and Methods in Physics Research B. vol. 106, 1995, pp. 333-338.117Rao et al. "Silane overpressure post-implant annealing of Al dopants in SiC: Cold wall CVD apparatus" Applied Surface Science 252: 3837-3842 (2006).118Rao, "Maturing ion-implantation technology and its device applications in SiC", Solid State Electronics 47:2, pp. 213-222, Elsevier Science Publishers (Feb. 2003).119Ryu et al. "10 kV, 123 mΩ-cm<2>4H-SiC Power DMOSFETs" Device Research Conference, 2004. 62nd DRC. Conference Digest, Jun. 21-23, 2004, Piscataway, NJ, USA, IEEE, Jun. 21, 2004, pp. 47-48. XP010748127.120Ryu et al. Article and Presentation: "27 mΩ-cm2, 1.6 kV Power DiMOSFETs in 4H-SiC," Proceedings of the 14 International Symposium on Power Semiconductor Devices & ICs 2002, Jun. 4-7, 2002, Santa Fe, NM.121S. Sridevan and B. Jayant Baliga, "Lateral N-Channel Inversion Mode 4H-SiC MOSFET's," IEEE Electron Device Letters, vol. 19, No. 7, pp. 228-230, Jul. 1998.122S. Sridevan, P.K. McLarty, and B.J. Baliga, "On the Presence of Aluminum in Thermally Grown Oxides on 6H-Silicon Carbide," IEEE Electron Device Letters, vol. 17, No. 3, pp. 136-138, Mar. 1996.123S.M. Sze SeMiconductor Devices, Physics and Technology. 2nd Edition, � 2002 John Wiley and Sons, p. 130.124S.T. Pantelides, "Atomic Scale Engineering of SiC Dielectric Interfaces," DARPA/MTO High Power and ONR Power Switching MURI Reviews, Rosslyn, VA, Aug. 10-12, 1999.125Senzaki et al.; Effects of Pyrogenic Reoxidation Annealing on Inversion Channel Mobility of 4H-SiC Metal-Oxide-Semiconductor Field-Effect Transistor Fabricated on (1120) Face; Japanese Journal of Applied Physics, Japan Society of Applied Physics, Tokyo, JP; vol. 40, No. 11B, Part 2; Nov. 2001; pp. L1201-L1203.126Singh, R. and J.W. Palmour, "Planer Terminations in 4H-SiC Schottky Diodes with Low Leakage and High Yields,"IEEE International Symposium on Power Semiconductor Devices and ICs, 1997, pp. 157-160.127Stengl et al., "Variation of Lateral Doping�A New Concept to Avoid High Voltage Breakdown of Planar Junctions", International Electron Devices Meeting; Washington, Dec. 1-4, 1985; pp. 154-157, XP002013050.128Stengl et al., Variation of Lateral Doping as a Field Terminator for High-Voltage Power Devices, IEEE Transactions on Electron Devices; vol. ED-33, No. 3, Mar. 1986, pp. 426-428, XP000836911.129Streetman "Bipolar Junction Transistors" Solid State Electronic Devices. Prentice Hall, Englewood Cliffs, NJ. 228-284 (1980).130Sugawara et al., "3.6 kV 4H-SiC JBS Diodes with Low RonS". Materials Science Forum, vols. 338-342:2, pp. 1183-1186 (2000). XP-000944901.131Sundaresan et al., "Ultra-low resistivity A1+ implanted 4H-SiC obtained by microwave annealing and a protective graphite cap", Solid-State Electronics vol. 52, 2008, pp. 140-145, XP022360431.132Suzuki et al. "Effect of Post-oxidation-annealing in Hydrogen on SiO2/4H-SiC Interface," Materials Science Forum, vols. 338-342 (2000) 1073-6.133Sze, S.M. Physics of Semiconductor Devices, John Wiley & Sons, p. 383-390, 1981.134Tang et al. "High-Voltage Implanted-Emitter 4H-SiC BJTS" IEEE Electron Device Letters, IEEE Service Center, New York, NY. vol. 23 No. 1. Jan. 1, 2002. XP001112376.135Tang et al. "Hybrid All-Sic MOS-Gated Bipolar Transistor (MGT)" Proceedings of the 14th International Symposium on Power Semiconductor Devices & ICS. ISPSD'02. Santa Fe, NM Jun. 4-7, 2002; International Symposium on Power Semiconductor Devices & IC's, New York, NY: IEEE, Jun. 4, 2002, pp. 53-56. XP010591564.136Thomas et al., "Annealing of Ion Implantation Damage in SiC Using a Graphite Mask", Material Research Society Symposium Y Proceedings vol. 572, Spring 1999, pp. 45-50.137Treu et al. "A Surge Current Stable and Avalanche Rugged SiC Merged pn Schottky Diode Blocking 600V Especially Suited for PFC Applications" Materials Science Forum vols. 527-529: 1155-1158 (2006).138V.R. Vathulya and M.H. White, "Characterization of Channel Mobility on Implanted SiC to Determine Polytype Suitability for the Power DIMOS Structure," Electronic Materials Conference, Santa Barbara, CA, Jun. 30-Jul. 2, 1999.139V.R. Vathulya, H. Shang, and M.H. White, "A Novel 6H-SiC Power DMOSFET with Implanted P-Well Spacer," IEEE Electronic Device Letters, vol. 20, No. 7, Jul. 1999, pp. 354-356.140V.V. Afanasev, M. Bassler, G. Pensl, and M. Schulz, "Intrinsic SiC/SiO2 Interface States," Phy. Stat. Sol. (a), vol. 162, pp. 321-337, 1997.141Vassilevski et al., "High Voltage Silicon Carbide Schottky Diodes with Single Zone Junction Termination Extension", Materials Science Forum, 2007 Trans Tech Publications, vols. 556-557 (2007) pp. 873-876, XP8124186.142Vassilevski et al., "Protection of selectively implanted and patterned silicon carbide surfaces with graphite capping layer during post-implantation annealing,"Institute of Physics Publishing, Semicond. Sci. Technol. 20 (2005) 271-278.143Wang et al. "High Temperature Characteristics of High-Quality SiC MIS Capacitors with O/N/O Gate Dielectric," IEEE Transactions on Electron Devices. vol. 47, No. 2, Feb. 2000, pp. 458-462.144Williams et al. "Passivation of the 4H-SiC/SiO2 Interface with Nitric Oxide," Materials Science Forum. vols. 389-393 (2002), pp. 967-972.145Xu et al. "Improved Performance and Reliability of N2O-Grown Oxynitride on 6H-SiH," IEEE Electron Device Letters. vol. 21, No. 6, Jun. 2000, p. 298-300.146Y. Li et al., "High Voltage (3 kV) UMOSFETs in 4H-SiC," Transactions on Electron Devices, vol. 49, No. 6, Jun. 2002.147Y. Wang, C. Weitzel, and M. Bhatnagar, "Accumulation-Mode SiC Power MOSFET Design Issues," Materials Science Forum, vols. 338-342, pp. 1287-1290.148Yilmaz, "Optimization and Surface Charge Sensitivity of High Voltage Blocking Structures with Shallow Junctions,"IEEE Transactions on Electron Devices, vol. 38, No. 3, Jul. 1991, pp. 1666-1675.149Zhang et al., "A 10-kV Monolithic Darlington Transistor with βforced of 336 in 4H-SiC," IEEE Electron Device Letters, vol. 30, No. 2, pp. 142-144, XP011240662.150Zhang et al.; Design and Fabrications of High Voltage IGBTs on 4H-SiC; 2006 IEEE Proceedings of the 18th International Symposium on Power Semiconductor Devices & ICs, Napels, Italy Jun. 4-8, 2006, pp. 1-4.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS20120068194 *Sep 15, 2011Mar 22, 2012Adrian ShipleySilicon carbide semiconductor devicesUS20120175674 *Apr 7, 2011Jul 12, 2012Adrian ShipleyPower switches for aircraft* Cited by examinerClassifications U.S. Classification327/318, 361/56, 327/319, 327/483International ClassificationH03K5/08Cooperative ClassificationH01L2924/1305, H01L2924/13091, H01L2224/04042, H01L2224/48137, H01L2224/06181, H01L29/7803, H01L25/072, H01L29/7302, H01L29/739, H01L27/0605, H01L27/088, H01L27/0705, H01L25/18, H01L29/1608, H01L21/8213European ClassificationH01L29/73B, H01L25/07N, H01L27/07F, H01L25/18, H01L27/06C, H01L21/82H, H01L29/78B2A, H01L29/739Legal EventsDateCodeEventDescriptionJan 22, 2013CCCertificate of correctionNov 2, 2009ASAssignmentOwner name: CREE, INC., NORTH CAROLINAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ZHANG, QINGCHUN;RICHMOND, JAMES THEODORE;AGARWAL, ANANT K.;AND OTHERS;SIGNING DATES FROM 20090914 TO 20091030;REEL/FRAME:023455/0575RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services