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| Number | Title | Issue Date |
| 6083811 | Method for producing thin dice from fragile materials Thin dice of fragile material are formed by making saw cuts in a front surface of a body of fragile material. The saw cuts define the thin dice, and have a depth equal to the desired thickness of the thin dice plus about 1 mil. A support film is then appl... | 07/04/2000 |
| 6018644 | Low-loss, fault-tolerant antenna interface unit An antenna interface unit (AIU) for providing low power loss, fault tolerant connectivity between multiple transmitters and an antenna, and between multiple receivers and the antenna. The antenna interface unit also eliminates single point failures in a t... | 01/25/2000 |
| 6011620 | Method and apparatus for the automatic inspection of optically transmissive planar objects Inspection apparatus for determining defects in a planar light transmissive object. A diffuse light is projected through a mask toward an object under test at an inspection location. A digital video camera observes the inspection location and obtains imag... | 01/04/2000 |
| 5970488 | Real-time distributed database system and method A distributed database system includes a plurality of nodes connected via a network medium. Each node runs at least one application and stores a database. Each database at least partially overlaps at least one other database. Each database includes a plur... | 10/19/1999 |
| 5962986 | Solid state RF light driver for electrodeless lighting A transformerless power oscillator for driving a high intensity electrodeless light bulb. The driver uses a silicon carbide static induction transistor (SIT) operating as a power oscillator powered by an unregulated power supply potential generated by a f... | 10/05/1999 |
| 5956901 | Gas driven hatch cover assembly A hatch assembly having a hatch cover biased to a normally closed position. The hatch cover is connected to an impeller contained and rotatable within a impeller chamber of a housing. When the cover is to be opened, pressurized gas is introduced into the ... | 09/28/1999 |
| 5954881 | Ceiling arrangement for an epitaxial growth reactor A ceiling arrangement for a high temperature epitaxial growth reactor in which silicon carbide epitaxial layers may be grown. The ceiling includes an upper layer of carbon foam and a lower layer of graphite bonded thereto. A support structure for the ceil... | 09/21/1999 |
| 5937317 | Method of making a low resistivity silicon carbide boule A nitrogen doped single crystal silicon carbide boule is grown by the physical vapor transport process by introducing nitrogen gas into the growth furnace. During the growth process the pressure within the furnace is maintained at a constant value, P... | 08/10/1999 |
| 5925895 | Silicon carbide power MESFET with surface effect supressive layer A silicon carbide metal semiconductor field effect transitor fabricated on silicon carbide substrate with a layer which suppresses surface effects, and method for producing same. The surface-effect-suppressive layer may be formed on exposed portions of th... | 07/20/1999 |
| 5923058 | Aluminum gallium nitride heterojunction bipolar transistor A heat tolerant, frequency responsive transistor for use in the microwave region includes a collector region, a base region overlying the collector region, and an emitter region including an AlGaN layer overlying at least part of said base region, forming... | 07/13/1999 |
| 5920318 | Method and apparatus for localizing an object within a sector of a physical surface A method and apparatus for localizing a point within a sector of a physical surface such as an airport surface that is represented by a plurality of line segments. After entering the physical surface representation, a list of polygons is generated wherein... | 07/06/1999 |
| 5917393 | Superconducting coil apparatus and method of making A superconducting coil mounted on, and in heat transfer relationship with, a heat conducting support cylinder. The superconducting coil is electrically insulated from the support cylinder by means of a refractory ceramic coating, such as aluminum oxide, o... | 06/29/1999 |
| 5912606 | Mercury wetted switch A switch having spaced apart conductors with a high resistivity gate member therebetween. First and second mercury droplets are respectively connected to the ends of the conductors. When a control signal is applied to the gate member, the mercury droplets... | 06/15/1999 |
| 5911864 | Method of fabricating a semiconductor structure The present invention provides for a wet etch and method for preparing a semiconductor device structure from a silicon carbide wafer. A first embodiment of the wet etch comprises a vessel, a tetrahydrofurfuryl alcohol and potassium nitrite etching solutio... | 06/15/1999 |
| 5909193 | Digitally programmable radio modules for navigation systems A programmable digital radio is configured to perform navigation functions. A receiver in the programmable digital radio receives analog signals from a navigation unit and digitizes the analog signals to produce digital navigation signals. The digital nav... | 06/01/1999 |
| 5906325 | Self-synchronizing pulley/winch apparatus and operating method for cable having electronic or other protruding elements spaced along its length A winch 100 is provided for taking up or paying out cable 13 without damaging protrusions 14 spaced along the cable from potentially high compressive forces applied to the cable when it is wound over drum members 16, 18, 20 of each of a pair of drum mecha... | 05/25/1999 |
| 5903020 | Silicon carbide static induction transistor structure A static induction transistor having a silicon carbide substrate upon which is deposited a silicon carbide layer arrangement. The layer arrangement has a plurality of spaced gate regions for controlling current flow from a source region to a drain region ... | 05/11/1999 |
| 5901037 | Closed loop liquid cooling for semiconductor RF amplifier modules A closed loop liquid cooling system for an RF transistor module including a plurality of elongated microchannels connected between a pair of coolant manifolds for conducting liquid coolant beneath one or more transistor dies to dissipate the heat generate... | 05/04/1999 |
| 5898561 | Capacitor arrangement and method of stabilizing same A capacitor module having a solid dielectric is cleared in a gaseous environment having an electric strength greater than that of air at a pressure of one atmosphere. A plurality of such cleared capacitor modules is formed into a stack which itself is the... | 04/27/1999 |
| 5895583 | Method of preparing silicon carbide wafers for epitaxial growth Silicon carbide wafers are prepared for semiconductor epitaxial growth by first lapping a silicon carbide wafer derived from a boule, by placing the wafer in a recess of a metal backed template and moving the wafer over and against a rotating plate. Two d... | 04/20/1999 |
| 5896105 | Distributed phased array antenna system An array of individual and autonomous modules are deployed in a region to be surveilled. Each module, contained in an air dropable bomblet, includes a GPS system for determining the exact location of the deployed module. The module also includes an rf rec... | 04/20/1999 |
| 5892279 | Packaging for electronic power devices and applications using the packaging A packaging for high-power devices such as Insulated Gate Bipolar Transistors includes a direct bonded copper substrate (DBC), such as beryllium oxide (BeO), soldered directly to a heat generating surface of the high-power device. The direct bonded copper... | 04/06/1999 |
| 5886479 | Precession of the plasma torus in electrodeless lamps by non-mechanical means A method and apparatus for exciting an electrodeless light bulb containing material including an inert gas and one or more chemical elements which generate a light emitting torus of plasma when excited by an RF signal and which includes two separate excit... | 03/23/1999 |
| 5886478 | Integral igniter for electrodeless lamps A coil extension of the RF coupling coil, surrounding an electrodeless light bulb containing an inert gas and selected chemical elements, generates a voltage at the distal end thereof which is higher than that which appears across the RF coupling coil pro... | 03/23/1999 |
| 5880517 | Microwave power transistor having matched impedance with integrated DC blocking capacitor and manufacturing method therefor A microwave power transistor device (20) is formed with impedance matching circuitry from a single elongated transistor die (70). Each of one or more transistor elements (56) is integrally formed with a blocking DC capacitor (54) on a common substrate of ... | 03/09/1999 |
| 5877721 | Apparatus and method for mitigating multipath An apparatus and method for discriminating between false images created by multipath and an aircraft of interest in an air traffic control environment by maintaining a three-dimensional database in the area of interest of the air traffic control environme... | 03/02/1999 |
| 5877659 | 90° phase shifter apparatus and method using a directly coupled path and a switched path A method and apparatus for accomplishing a 90° relative phase shift employing a high characteristic impedance outer leg of length λ/2 and a low characteristic impedance through leg of length λ/4. The high characteristic impedance outer leg is directly ... | 03/02/1999 |
| 5876539 | Fabrication of ferrite toroids A method of fabricating ferrite toroids used in ferrite phase shifters. The method employs fabrication techniques found in low temperature cofired ceramics (LTCC) tape technology and involves fabricating long rectangular through-holes, as is required by t... | 03/02/1999 |
| 5878334 | High temperature superconducting low power receiver protector/clutter automatic gain control for radar receiver The present invention provides for a low power receiver protector and stepped attenuator for conditioning a received input signal within a microwave receiver front end. The low power receiver protector includes a detector for generating a surge signal in ... | 03/02/1999 |
| 5873937 | Method of growing 4H silicon carbide crystal A method of growing 4-H polytype silicon carbide crystals in a physical vapor transport system where the surface temperature of the crystal is maintained at less than about 2160° C. and the pressure inside the PVT system is decreased to compensate for th... | 02/23/1999 |
| 5871336 | Thermal transpiration driven vacuum pump A micro-machined vacuum pump is provided which may be utilized with microsensors. The pump in accordance with the present invention is preferably fabricated within a semiconductor substrate and utilizes thermal transpiration to provide compression. The pu... | 02/16/1999 |
| 5867535 | Common transmit module for a programmable digital radio A common transmit module of a programmable digital radio has a digital submodule which receives a bit stream and produces a modulated IF signal, and an analog submodule which receives the modulated IF signal and converts the modulated IF signal to a frequ... | 02/02/1999 |
| 5859878 | Common receive module for a programmable digital radio A digital submodule is included in a software programmable common receive module for receiving IF signals and producing a serial bit stream. The digital submodule is programmable based on a selected application of a plurality of radio applications and, if... | 01/12/1999 |
| 5855803 | Template type cavity-formation device for low temperature cofired ceramic (LTCC) sheets A cavity pattern for a laminated structure such as a substrate for integrated circuitry is formed in a sheet of unfired low temperature cofired ceramic (LTCC) material also known as "green" tape. One sheet at a time is placed in a flexible ram forming die... | 01/05/1999 |
| 5854610 | Radar electronic scan array employing ferrite phase shifters A radar electronic scan apparatus 10 employs an array of transmit/receive phase-shift modules 14 with a plurality of ferrite phase-shift subarrays 16. Each ferrite phase-shift subarray has a pair of phase-shift ferrite substrates 32A and 32B mounted on a ... | 12/29/1998 |
| 5853601 | Top-via etch technique for forming dielectric membranes A top-via etch technique for forming dielectric membranes for thin film devices, the dielectric membrane being deposited on the upper planar surface of the substrate. After the thin film device is formed on the dielectric membrane, a photoresist etch mask... | 12/29/1998 |
| 5854604 | High-power waveform generator A method and apparatus for generating a low phase noise RF signal where the output from a low phase-noise stabilized local oscillator operating at relatively high frequencies in the GHz range is combined in a power combiner with a digital data stream gene... | 12/29/1998 |
| 5852386 | Apparatus and method for microwave field strength stabilization in cell type atomic clocks The microwave field intensity of a cell type atomic clock is stabilized through time division feedback control of the power of the microwave signal implemented by a microcontroller. The depth of the microwave dip is calculated from differences in measurem... | 12/22/1998 |
| 5852339 | Affordable electrodeless lighting An electrodeless light bulb assembly having a standard light bulb base located at one end of an extruded cylindrical heat sink including a set of elongated fins extending radially outward from an annular inner body portion. An electrodeless light bulb, ex... | 12/22/1998 |
| 5851852 | Die attached process for SiC A die attach procedure for SiC uses the scrubbing technique to bond a SiC die to a package. A first layer is formed on the SiC die. This first layer, preferably of nickel, bonds to the SiC die. A second layer, preferably amorphous silicon, is then formed ... | 12/22/1998 |
