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| Number | Title | Issue Date |
| 6239405 | Displacement controlled butt welding Two parts are coaxially aligned at opposing face ends. The parts are temporarily compressed together at the face ends during welding thereof to control size of the resulting weld joint. Temporary compression may be effected by applying a compression force... | 05/29/2001 |
| 6142027 | Method and apparatus for calibrating a densitometer based sensor for shot peening An apparatus and method are provided for calibrating a densitometer based sensor for measuring the linear density of the shot particles passing through a shot peening system to ensure that mass flow rate readings and shot velocity readings calculated ther... | 11/07/2000 |
| 5832923 | Utrasound imaging system architecture employing switched transducer elements An ultrasonic imaging system which uses transform beamforming in a two-dimensional context includes a two-dimensional array of transducer elements, a plurality of groups of local busses, and a plurality of sets of switching circuits. Each transducer eleme... | 11/10/1998 |
| 5828273 | Phase splitter for high data rate communication A phase splitter includes an input port coupled to receive a modulated carrier having a relatively wide bandwidth and has first and second output ports for supplying, respectively, first and second modulated carrier constituents having a uniform phase ang... | 10/27/1998 |
| 5809087 | Coherent detection architecture for remote calibration of coherent systems An architecture for remote calibration of coherent systems uses coherent reference and calibration signals that contain the relative amplitude and phase information desired in the calibration process. Circuitry extracts the relevant amplitude and phase in... | 09/15/1998 |
| 5774493 | Sequence constructions for delay-and-correlate transmitted reference signaling A direct conversion receiver for delay-and-correlate transmitted reference spread spectrum signaling apparatus improves the performance of a delay-and-correlate transmitted reference spread spectrum communication system with essentially no added complexit... | 06/30/1998 |
| 5761238 | Transmitted reference spread spectrum communications system A low complexity and low cost transmitted reference spread spectrum communications system provides several methods of generating a suitable wideband carrier, a method for combining the wideband carrier with a narrowband modulated wideband carrier, and a n... | 06/02/1998 |
| 5760723 | Delta-sigma analog-to-digital converter including charge coupled devices A delta sigma modulator having reduced quiescent power consumption as compared to known delta sigma modulators utilizes no operational amplifiers and includes, in one embodiment, an input CCD and a summing CCD coupled to the output of the input CCD. A rea... | 06/02/1998 |
| 5757300 | Feed-forward bandpass delta-sigma converter with tunable center frequency Delta sigma modulators for accepting input signals having amplitudes up to -1 dB of full-scale and a center frequency (FS) in the range FS /90, 44F 90!, and which are not prone to internal overflow, require few circuit parameters, ... | 05/26/1998 |
| 5754131 | Low power delta sigma converter A delta sigma modulator that has a low power dissipation without sacrificing modulator resolution includes, in one embodiment, a current mode digital to analog converter (DAC) in shunt with a conventional op amp in the first stage of the delta sigma modul... | 05/19/1998 |
| 5736707 | Electric resistance welding of electric motor cage rotor assemblies Electric resistance welding provides localized heating for simultaneous upset welding of the copper bars and copper end rings of an electric motor cage rotor assembly. Rapid application of an axial force completes the upset welds. The localized heating is... | 04/07/1998 |
| 5734258 | Bidirectional buck boost converter A bidirectional buck boost converter and method of operating the same allows regulation of power flow between first and second voltage sources in which the voltage level at each source is subject to change and power flow is independent of relative voltage... | 03/31/1998 |
| 5726463 | Silicon carbide MOSFET having self-aligned gate structure A SiC MOSFET having a self-aligned gate structure is fabricated upon a monocrystalline substrate layer, such as a p type conductivity 댖H silicon carbide (SiC) substrate. An SiC n+ type conductivity layer, epitaxially grown on the substrate layer, i... | 03/10/1998 |
| 5723956 | Low cost electronic ultracapacitor interface technique to provide load leveling of a battery for pulsed load or motor traction drive applications A battery load leveling arrangement for an electrically powered system in which battery loading is subject to intermittent high current loading utilizes a passive energy storage device and a diode connected in series with the storage device to conduct cur... | 03/03/1998 |
| 5723517 | System for controlling the color of compounded polymer(s) using in-process color measurements A system for controlling the color of compounded polymer(s) comprises: a compounder for mixing the constituents of the compounded polymer(s) to produce a substantially homogeneous mixture; a sensor for measuring the color of the substantially homogeneous ... | 03/03/1998 |
| 5717732 | CT imaging system with independently movable multi-resolution detector A system is provided for acquiring data for use in constructing a CT image of an object having a region of special interest, the system generally including an x-ray cone-beam source and an array detector having first and second zones, the resolution of th... | 02/10/1998 |
| 5710699 | Power electronic interface circuits for batteries and ultracapacitors in electric vehicles and battery storage systems A method and apparatus for load leveling of a battery in an electrical power system includes a power regulator coupled to transfer power between a load and a DC link, a battery coupled to the DC link through a first DC-to-DC converter and an auxiliary pas... | 01/20/1998 |
| 5704105 | Method of manufacturing multilayer array ultrasonic transducers A method for fabricating "1.5D" and "2D" multilayer ultrasonic transducer arrays employs dicing saw kerfs, which provide acoustic isolation between rows. The kerfs are metallized to provide electrical connection between surface electrode layers and buried... | 01/06/1998 |
| 5699012 | High gain, low offset input amplifier An input signal buffer amplifier that has a high gain and a low offset voltage is implemented as an integrated circuit (IC) along with other components that perform further processing on an input signal. In one embodiment, the buffer amplifier includes fi... | 12/16/1997 |
| 5691980 | Local communication network for power reduction and enhanced reliability in a multiple node tracking system A mobile local area network (LAN) of tracked assets utilizing minimal power and bandwidth allows a large number of assets to be tracked in a practical manner. The mobile LAN is established between a plurality of tracking units in close proximity. Assets a... | 11/25/1997 |
| 5689331 | Laser apparatus with wander correction A laser apparatus includes a laser for emitting a laser beam which is reflected from a primary mirror through a primary lens in a primary optical path and focused at a primary spot. A portion of the laser beam leaks through a back face of the mirror and i... | 11/18/1997 |
| 5686888 | Use of mutter mode in asset tracking for gathering data from cargo sensors The condition and/or integrity of goods is monitored while in transit using a local area network of tracked assets. Autonomous electronic sensors are situated in proximity to the cargo being shipped. These sensors communicate with an asset tracking unit a... | 11/11/1997 |
| 5682160 | High-order delta sigma analog-to-digital converter with unit-delay integrators A delta sigma modulator which enables each cascaded integrator to settle independently within a full clock period and uses binomial coefficients in the feedback paths to obtain the required sinusoidal shaping of quantizer error, achieves an increase in bo... | 10/28/1997 |
| 5682139 | Railcar location using mutter networks and locomotive transmitter during transit A method of tracking railcars in transit using global positioning techniques involves determining the location of a railcar by using a Global Positioning System (GPS) receiver and a satellite transceiver on board the locomotive, and a local area network o... | 10/28/1997 |
| 5682161 | High-order delta sigma modulator A delta-sigma modulator includes, in one embodiment, cascaded unit-delay integrators, the number of which is selected depending upon the order desired. The modulator further includes an n-bit (or multi-bit) A/D converter coupled to the output of the last ... | 10/28/1997 |
| 5677696 | Method and apparatus for remotely calibrating a phased array system used for satellite communication using a unitary transform encoder A method and apparatus for remotely calibrating a system having a plurality of N elements, such as a phased array system, is provided. The method includes generating coherent signals, such as a calibration signal and a reference signal having a predetermi... | 10/14/1997 |
| 5676538 | Fuel nozzle for low-NOx combustor burners This invention relates to low NOx combustor burners of the type that employ an irregular edge at the edge of the center hub of the combustor burner. Such structures of this type, generally, reduce the strength of combustion instabilities by disrupting the... | 10/14/1997 |
| 5675336 | Analog memory unit An analog memory unit that can be implemented, at least in part, on an application specific integrated circuit (ASIC), utilizes at least the ASIC arithmetic logic unit (ALU) to enhance performance and to generate and store an accurate measure of power lin... | 10/07/1997 |
| 5668850 | Systems and methods of determining x-ray tube life A method and apparatus to facilitate avoiding failure of a computed tomography x-ray source while performing a patient scan permits detection of the onset of a potential x-ray source failure and estimation of the x-ray source life expectancy. The informat... | 09/16/1997 |
| 5663600 | Variable speed wind turbine with radially oriented gear drive A wind turbine assembly includes a gear drive assembly having an outer tubular member and an inner tubular member, the inner member being positioned coaxially within the outer member. A pair of spaced bearings circumscribe the inner tubular member and sup... | 09/02/1997 |
| 5659240 | Intelligent battery charger for electric drive system batteries A battery charger connected to a source of substantially constant voltage power includes a regulator for conditioning the power for application to a battery to be charged. Net discharge current from the battery is monitored, as a function of time, during ... | 08/19/1997 |
| 5656184 | Method of laser welding open receptacles A laser is used within assembled component parts to create autogenous welds to produce a receptacle. This method requires no post-weld treatment. This laser welding is suitable to construct electrical distribution panel boxes.... | 08/12/1997 |
| 5655276 | Method of manufacturing two-dimensional array ultrasonic transducers In fabricating a two-dimensional array transducer wherein individual preformed piezoelectric elements are manufactured separately in a high temperature ceramic firing process, a ceramic substrate is provided, having a surface with a plurality of electrode... | 08/12/1997 |
| 5652778 | Cooling X-ray tube An X-ray tube includes a housing containing an anode target having a target shaft supported in the housing by a bearing. The target is rotated, and a cathode emits an electron beam against the target to create X-rays which are discharged from the tube thr... | 07/29/1997 |
| 5651656 | Rail transportable ramps for loading semi-trailers on trains A ramp car for use in an intermodal train includes a ramp having a set of rail wheels mounted at one end and a connector at the one end for coupling the ramp car to a flat bed rail car. A second connector, including lifting apparatus, is operatively assoc... | 07/29/1997 |
| 5648894 | Active filter control A set of command signals is generated for application to the respective lines of a four-wire three phase power distribution system to compensate for harmonic distortion and neutral unbalance. A transform operation is performed upon a first set of signals,... | 07/15/1997 |
| 5646600 | Instrument for detecting potential future failures of valves in critical control systems Apparatus for monitoring the health and response of critical electromechanical control valves to detect the likelihood of future valve malfunction including the use of wavelet decomposition to selectively enhance portions of the valve response signal for ... | 07/08/1997 |
| 5644510 | Apparatus and method for motor overload protection using an elapsed-time signal for enabling computation of motor temperature data independently of temporary power interruption Apparatus for electrically coupling a motor to a power source and providing overload protection to the motor includes a controller having a programmable module for periodically computing data indicative of motor temperature based upon motor current. The c... | 07/01/1997 |
| 5642041 | Alternating current sensor employing parallel plates and having high dynamic range and accuracy An alternating current sensor includes a first conductor plate, a second conductor plate positioned in spaced relationship relative to the first conductor plate and facing the first conductor plate, and a third conductor plate for electrically interconnec... | 06/24/1997 |
| 5633800 | Integrated model-based reasoning/expert system diagnosis for rotating machinery A diagnostic system and method for rotating machinery having mechanical problems combine AI-based interpretive reasoning with rotordynamic-based modeling and numerical optimization. A vibration response in the machinery to be diagnosed is first measured b... | 05/27/1997 |
