Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 5867287 | Head up display with a lens decentered to the optical axis of the illumination A low cost, compact projection display source that serves as a very bright image source for an automotive head up display. The present invention is comprised of a high intensity halogen light source and a liquid crystal display. The liquid crystal display... | 02/02/1999 |
| 5786739 | Integrated evanescent mode filter with adjustable attenuator A waveguide evanescent mode filter is integrated with a monolithic microwave integrated circuit (MMIC) by forming both the MMIC circuitry and the waveguide filter on a single substrate that forms a common ground plane for both elements. The waveguide has ... | 07/28/1998 |
| 5768109 | Multi-layer circuit board and semiconductor flip chip connection A multi-layer circuit board (11) has a cofired ceramic with a configuration of circuit traces (27) extending though differing layers of the multi-layer circuit board (11) to facilitate mountable conductive contact with semiconductor flip chips (13). Via h... | 06/16/1998 |
| 5737715 | Frequency normalization utilizing GPS pulse time and time interval signal A local oscillator frequency measurement system for measuring the frequency of a local oscillator of an ESM receiver. The frequency measurement system includes a global positioning system (GPS) receiver (20) for providing a GPS pulse time and time interva... | 04/07/1998 |
| 5736956 | Unlocked W-band receiver with coherent features A coherent radar receiver that has pulse-to-pulse coherence using an unlocked voltage controlled oscillator, such as a Gunn voltage controlled oscillator. The present invention is a W-band, for example, bistatic receiver that uses a scanning sum channel a... | 04/07/1998 |
| 5734278 | Low-power, high-reliability switching rotary phase shifter device A driver circuit for regulating the current flowing through the coils of a rotary field microwave phase shifter. The circuit includes logic circuitry functions which implements an algorithm to provide decision making capability to avoid failure-inducing c... | 03/31/1998 |
| 5731726 | Controllable precision on-chip delay element A controllable precision delay line implemented in a digital integrated circuit device including a counter circuit for measuring a representative propagation delay for a delay element in the digital integrated circuit, and a binary controlled digital dela... | 03/24/1998 |
| 5729367 | Multiple-image multiplexed holographic display A multiple image multiplexed holographic display including a light pipe (11, 111) having first and second opposing surfaces (11a, 11b, 111a, 111b) and a plurality of input surfaces (15, 115) located between adjacent edges of the first and second opposing ... | 03/17/1998 |
| 5729576 | Interference canceling receiver A receiver used in a system having a transmitter (10) that sends an exciting signal to a remote transponder (18) is configured to receive a relatively weak signal from the transponder and to cancel out relatively high level interference from the transmiss... | 03/17/1998 |
| 5727000 | Signature analysis usage for multiple fault isolation Test equipment and test methods employing signature analysis to achieve fault isolation of parts contained in digital modules. Fault free signatures of a digital module are stored in a lookup table that are derived from physical measurement or simulation ... | 03/10/1998 |
| 5726656 | Atmospheric correction method for interferometric synthetic array radar systems operating at long range A method of computing and correcting phase errors due to atmospheric turbulence in a dual-antenna multiple-pass synthetic array radar (SAR) interferometer system. The method improves topographic mapping accuracy at very long ranges. The method computes an... | 03/10/1998 |
| 5727204 | Database organization for rapid multi-set membership determination A method to organize, store and retrieve information in a database to facilitate rapid object identification. An interval set is defined as an interval on a number line. The database is built from a list of interval sets as input sets. The method organize... | 03/10/1998 |
| 5724047 | Phase and time-difference precision direction finding system A precision direction finding system for making precision angle of arrival estimates for a signal received through two antenna elements separated in space. Phase interferometry is used to determine a precise angle of arrival, with multiple ambiguities due... | 03/03/1998 |
| 5724011 | Voltage variable dielectric ridged waveguide phase shifter A phase shifter employing a voltage variable dielectric material to add controlled phase delay in a ridged-waveguide section. The dielectric material has the property that its dielectric constant varies with changing electric field applied to the material... | 03/03/1998 |
| 5721598 | High efficiency, high color purity, on-axis holographic color filter and full-color liquid crystal display A liquid crystal display comprising a four-layer holographic filter that projects up to 100 percent of incident white light while providing improved color purity. The four-layer holographic filter processes normal incidence collimated white light derived ... | 02/24/1998 |
| 5721554 | Near field planar wave generation for electronic range testing A near field planar wavefront generation method that uses a relatively small number (three to five) of transmitting antennas disposed a predetermined distance from an antenna array having a multi-wavelength aperture that is part of a system under test. Th... | 02/24/1998 |
| 5719975 | Optically reconfigurable conductive line element An optical fiber having a conductive layer disposed therearound has sections removed therefrom that form gaps that expose the underlying optical fiber. Light manifolds are formed at each gap, such as are provided by Bragg gratings photoinduced in the core... | 02/17/1998 |
| 5717702 | Scan testing digital logic with differing frequencies of system clock and test clock A boundary scan test circuit that includes Y scan flip-flops serially connected in a sequence from a first scan flip-flop to a Yth scan flip-flop and clocked with a system clock signal, and circuitry for providing scan input data to the first s... | 02/10/1998 |
| 5717405 | Four-port phase and amplitude equalizer for feed enhancement of wideband antenna arrays with low sum and difference sidelobes A four-port transmission line device that processes two incoming RF signals of arbitrary phase and amplitude to output two corresponding RF signals of equal phase and amplitude. Two sets each of two quarter-wave transmission line segments are connected in... | 02/10/1998 |
| 5708442 | Correlation radiometer imaging system A passive imaging system that uses an antenna having two antenna elements. The system cross-correlates received signals with a reference function to achieve high resolution. The antenna elements are rectangular with their long dimensions oriented normal t... | 01/13/1998 |
| 5708573 | Varactor controlled fixed frequency VHF DC-DC converter A DC to DC converter including a resonant switching circuit (13, 51 , 115, 151, 125, 153); an impedance matching circuit (53) responsive to the resonant switching circuit; a rectifier circuit (55) responsive to the impedance matching circuit; an output fi... | 01/13/1998 |
| 5708835 | Dual-directional parallel processor A dual-directional parallel processor. The inventive processor (10) includes an array (20) of processing elements (30). Each processing element has a first circuit (31) for inputting and outputting data, a second circuit (32) for inputting and outputting ... | 01/13/1998 |
| 5708380 | Test for hold time margins in digital systems A flip-flop circuit that includes a first NAND gate (11) responsive to a D input to the flip-flop circuit and a first mode control signal for providing a first NAND gate output; a second NAND gate (12) responsive to a serial scan input to the flip-flop ci... | 01/13/1998 |
| 5706107 | Windshield grating hologram for increasing bus driver's field of view A holographic viewing apparatus for allowing an operator of a bus to view a portion of a blind spot region located in front of the bus and below the windshield of the bus. The holographic viewing apparatus includes a volume transmission holographic gratin... | 01/06/1998 |
| 5706457 | Image display and archiving system and method A system 10 and methods for acquiring and archiving images derived from multiple sources with minimal operator interaction and understanding of the archiving computer 11. The system 10 and methods provide for reception of digitized images via modem 24 fro... | 01/06/1998 |
| 5705962 | Microwave power dividers and combiners having an adjustable terminating resistor Microwave apparatus, such as microwave power dividers or combiners, having an adjustable terminating resistor. The present invention allows adjusting or trimming of the resistor and pretesting of substrates on which the apparatus is formed prior to instal... | 01/06/1998 |
| 5706011 | Method for determining terrain following and terrain avoidance trajectories A method that enables an aircraft to determine an optimal terrain following, terrain avoidance, or threat avoidance trajectory over terrain, thereby reducing its exposure and increasing its survivability. A grid of discrete terrain points corresponding to... | 01/06/1998 |
| 5703590 | Detecting active emitters using scan rate correlation of tracking receiver and radar data A method wherein the scan rate of an active emitter is simultaneously estimated by a tracking receiver and a radar system and are then compared to correlate tracks generated by the tracking receiver and the radar system. The output produced by the present... | 12/30/1997 |
| 5703538 | Radar exciter local oscillator phase lock acquisition control circuit A phase lock acquisition control circuit for the local oscillator (LO) of a radar exciter. The control circuit includes a programmable logic array, a microsequencer and a counter employed as a divide-by-eight circuit which supplies a clock reference for t... | 12/30/1997 |
| 5703514 | Digital frequency divider phase shifter A phase shifter using digital counters allows extremely accurate phase shifts. In a parallel circuit arrangement of a number of basic phase shift units, which each includes a dual modulus counter and phase control circuitry for controlling the counter mod... | 12/30/1997 |
| 5702805 | Photopolymer holographic decal for plastic substrate A hologram decal structure including a photopolymer hologram layer having hologram fringes recorded therein, a transparent pressure sensitive adhesive layer disposed on a first surface of the photopolymer hologram layer, and a transparent urethane coating... | 12/30/1997 |
| 5703790 | Series connection of multiple digital devices to a single power source A digital processing system including a first processor (11) and a second processor (21) connected in series between a first power supply node (101) and a second power supply node (103). The second processor is configured to operate at a variable processi... | 12/30/1997 |
| 5703875 | Integrated control and data message network A switch for communicating short control messages and longer data messages. The control and data switch comprises separate resources for control messages and for data messages, while sharing communication links. Each input port of the switch has a separat... | 12/30/1997 |
| 5703771 | VHF inverter with self regulation for any load A VHF inverter including an inverter circuit (100) for providing an inverter output; a constant magnitude, variable phase impedance transforming circuit (54, 154) responsive the inverter; and a load circuit (55, 155) responsive to the impedance transformi... | 12/30/1997 |
| 5703599 | Injection molded offset slabline RF feedthrough for active array aperture interconnect An offset RF interconnect structure for interconnecting an active array radiating aperture to a transmit/receive (T/R) module sub-array, wherein the corresponding input/output (I/O) ports lie on different lattices. The interconnect structure employs diele... | 12/30/1997 |
| 5699611 | Method of hermetically self-sealing a flip chip A package containing an integrated circuit has all of its I/O contacts on one of the package faces. The periphery of that face is processed to be wettable with solder. The substrate to which the package is to be attached has corresponding contacts and has... | 12/23/1997 |
| 5698906 | Remotely-controlled locking systems employing a holographic display A remote controlled locking system employing a holographic window display, particularly adapted for vehicle use. The system includes a remotely-operated transmitter for transmitting locking and unlocking signals, and a locking mechanism that is locked and... | 12/16/1997 |
| 5699545 | Row address generator in a memory address system A system and method for generating row addresses for a memory structure on a column by column basis. In accordance with the novel method, a column read start address (SC) is subtracted from a column address (COL) to provide a column offset. Next, the colu... | 12/16/1997 |
| 5699228 | Method of interconnecting leadless devices to printed wiring boards and apparatus produced thereby A method of interconnecting a leadless multichip module to a printed wiring board using a solder-free interconnect to form an electronic module. The present invention also contemplates the electronic module produced by the method. The electronic module co... | 12/16/1997 |
| 5696516 | Radar system and accurate method of range resolution In accordance with the teachings of the present invention, a radar system (20) and method of determining the range (R) to a remote target (14) is provided. The method includes computing a plurality of simulated M-dimensional points (xo (t)) as ... | 12/09/1997 |
