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| Number | Title | Issue Date |
| 4868841 | Directly heated ceramic catalyst support A directly heated catalyst 10 is comprised of an electrically conductive ceramic substrate 12 having a catalytic coating 14 applied to at least an outer surface thereof. In an illustrative embodiment of the invention the catalytic coating is a noble metal... | 09/19/1989 |
| 4868833 | Raman cavity dump laser A lasing medium (3) and a Raman medium (20) share a common optical cavity. The lasing medium (3) projects laser light into the Raman medium (20) and, when a threshold intensity within the Raman medium is reached, the Raman medium absorbs the laser light a... | 09/19/1989 |
| 4860321 | Lock detector for feedback loops A receiver is disclosed for acquiring and tracking a data signal in a highly stressed environment. The receiver comprises first and second I.F. sections, a mixer for translation from the first I.F. frequency to the second I.F. frequency, a 2 kHz bandpass ... | 08/22/1989 |
| 4854526 | Spacecraft design enabling the compact nesting of multiple spacecraft in the launch vehicle A spacecraft (100) such as a satellite, is shaped roughly in the form of a cup with a hollow inner cavity (106) such that a plurality of such spacecraft may be stowed for launch in a nested stack (204), thereby enabling a greater number of satellites to b... | 08/08/1989 |
| 4854975 | Solar cell with integrated interconnect device and process for fabrication thereof A solar cell assembly wherein a solar cell is provided with electrical layer contacts for both the p-type semiconductor layer and the n-type semiconductor layer which are exposed on a top side of the solar cell, so that electrical contact to both layers c... | 08/08/1989 |
| 4837699 | Method for controlling the spin axis attitude of a spinning spacecraft A system located on board a geosynchronous satellite for detecting spin axis precession and developing thruster control signals for restoring the spin axis to the desired attitude. Fuel economy is enhanced by performing the major attitude correction at a ... | 06/06/1989 |
| 4825215 | Radiometric imager having a frequency-dispersive linear array antenna A radiometric imager for providing a series of registered images of a scene, each image corresponding to the radiation pattern for a unique, narrow frequency band. One embodiment includes a single frequency-dispersive linear antenna providing an output si... | 04/25/1989 |
| 4824052 | Nutation sensor and nutation control system for a dual-spin stabilized satellite A nutation sensor and nutation control system using a relative spin phase sensor in a dual-spin stabilized satellite is disclosed. The relative spin phase sensor provides index pulses indicative of the relative spin phase and rate between the satellite ro... | 04/25/1989 |
| 4818964 | Switchable multi-power-level short slot waveguide hybrid coupler A short slot waveguide hybrid coupler is disclosed wherein the coupling factor is switchable over a predetermined range of discrete coupling factors. A coupling slot formed in the common dividing wall between the contiguous first and second waveguides of ... | 04/04/1989 |
| 4818037 | Method for estimating reference speed and acceleration for traction and anti-skid braking control A method for estimating vehicle reference speed and acceleration utilizing an adaptive filter for providing periodically updated reference values given by a currently extrapolated value plus a correction term which is a function of current wheel slip, whe... | 04/04/1989 |
| 4815018 | Spurless fractional divider direct digital frequency synthesizer and method A direct digital frequency synthesizer including a counter circuit for receiving input signal pulses and for providing a corresponding output signal after receiving a number of input signal pulses, the number being selected based on the state of a control... | 03/21/1989 |
| 4814772 | Method and apparatus for precisely measuring relative velocity in an interferometric radiometer A method and apparatus for precisely determining the relative velocity of an interferometer and a scene being scanned. The apparatus uses a matched filter technique in which reference signals based on high and low relative velocity estimates are correlate... | 03/21/1989 |
| 4809194 | Image processing system and method using modulated detector outputs An image processing system 10 includes an array (12) of detectors 14, each of which is designed to produce a current proportional to incident radiation. This system provides image processing at a viable sampling rate even for very large arrays and permits... | 02/28/1989 |
| 4802767 | Method and apparatus for optical nutation sensing An optical nutation sensing method and apparatus is provided which is functional at low spin rates and during thruster firings while being relatively insensitive to spacecraft flexures. The advantageous operation of the present invention is afforded by pr... | 02/07/1989 |
| 4799065 | Reconfigurable beam antenna A reconfigurable beam antenna system (12) comprises focusing means, a plurality of antenna elements (A, B, C, and D), a feed network (14), and a variable beam controlling means (16). The focusing means has a reflecting surface (18) which is adapted to ref... | 01/17/1989 |
| 4799028 | Zero phase shift active microwave oscillators with resistive feedback in field effect transistor amplifiers A microwave oscillator in a loop configuration comprises three substantially identical amplifier stages each having its own phase shift at a selected oscillating frequency. A transmission delay element having a phase shift at the selected oscillating freq... | 01/17/1989 |
| 4797995 | Method of fabricating a hollow squarax inner conductor A method of fabricating hollow square inner conductors having precise outer dimensions is disclosed. A first "u" shaped slot (10) is machined in a base plate (12) and a cover plate (16) is then brazed to the sloted surface (18). The cover plate (16) is ma... | 01/17/1989 |
| 4797643 | Coaxial hybrid coupler and crossing element A microwave crossover by which an electromagnetic wave can crossover from one waveguide to another waveguide is formed completely within a planar structure having two hybrid couplers arranged in tandem with output ports of the first coupler connected to i... | 01/10/1989 |
| 4797682 | Deterministic thinned aperture phased antenna array A phased array antenna (10) includes a plurality of radiating elements (14) arranged in concentric rings (11, 12) to form a deterministically thinned antenna aperture which facilitates heat removal from the array, while minimizing side lobe signals and th... | 01/10/1989 |
| 4797681 | Dual-mode circular-polarization horn A dual mode circularly polarized horn radiator is useful in the testing of radiation apparatus in an anechoic chamber. The horn has a buffered radiating aperture which permits a plurality of the horns to be arranged in an array with minimal mutual couplin... | 01/10/1989 |
| 4796253 | Time base converter employing two reference position phase lock loop A time base converter employs a two position, phase lock loop (40) to write twice orthogonally spaced signals into a split phase memory (34), which in turn can be read out at the timing rate of an incorporating communications system. The converter effecti... | 01/03/1989 |
| 4796033 | Hub and rim reflector A non-furlable paraboloidal radio frequency reflector (10) is formed of a mesh-like flexible reflective surface (18) supported by a central hub (12) and a peripheral rim (14). The hub and rim are interconnected by flexible spoke-like structural cables (16... | 01/03/1989 |
| 4789948 | Method and apparatus for determining communications link quality and receiver tracking performance Apparatus is disclosed for measuring a receiver measurement data set, and a digital processor adapted to determine a derived data set indicative of the communications link quality and dynamic receiver performance, utilizing powerful data reduction algorit... | 12/06/1988 |
| 4788270 | Process for preparing a urethane coating comprising freezing a premix of an isocyanate and a polyol in a solvent A frozen urethane premix coating material is prepared by mixing together an isocyanate, a hydroxy terminated aliphatic polyol, and an organic solvent in an amount of at least 75 percent by weight of the total weight of the premix, and then freezing the mi... | 11/29/1988 |
| 4785207 | Leakage regulator circuit for a field effect transistor A leakage regulator for use with switching power supplies which include a field effect transistor (FET) is disclosed. The leakage regulator comprises a bias circuit coupled in a feedback arrangement with the FET to provide a self-generated bias voltage. T... | 11/15/1988 |
| 4783639 | Wideband microwave diplexer including band pass and band stop resonators A wideband microwave diplexer is provided which includes a waveguide section characterized by a longitudinal dimension, and defining first and second longitudinally spaced ports, for propagating microwave power substantially within a first lower frequency... | 11/08/1988 |
| 4783632 | Multi-arm frequency sweep generator A multi-arm frequency sweep generator 10 provides frequency sweep characterized by precise waveform control (linearization), steep slopes, and a high repetition rate. An impulser (12) generates pulses which are distributed by a multiplexer (14) to the mul... | 11/08/1988 |
| 4780694 | Directional filter system A filter system is composed of two identical filters coupled between an input waveguide and an output waveguide to provide a 4-port directional filter characteristic operable with quasi-elliptic linear modes of electromagnetic propagation within each of t... | 10/25/1988 |
| 4780693 | Probe coupled waveguide multiplexer A probe coupled waveguide multiplexer is provided including a first waveguide which serves as a multiplexing manifold; a second waveguide, having a cavity, typically a filter, which is probe coupled to the first waveguide; and a third waveguide which has ... | 10/25/1988 |
| 4774558 | Thermally-activated, shorting diode switch having non-operationally-alterable junction path The present invention generally provides a thermally-activated, shorting-diode switch whose composite diode structure possesses a non-operationally-alterable junction path, and whose diode shorting is effectuated by temperature-sensitive companion element... | 09/27/1988 |
| 4772872 | Alignment system for encoders An improved encoder alignment system is disclosed which provides an indication of the extent of misalignment and a measure of the rate at which the misalignment may be changing. The invention is adapted for use with a conventional encoder which provides a... | 09/20/1988 |
| 4758842 | Horn antenna array phase matched over large bandwidths An array of horn antennas with non-uniform aperture sizes is disclosed wherein the individual horns phase track over a wide frequency band. The horn with the smallest aperture is considered the reference horn, and its length defines the overall horn lengt... | 07/19/1988 |
| 4757964 | Method for controlling the attitude of a spinning body in orbit A method for passively stabilizing the attitude of a spinning orbiting body subject to orbital precession to maintain the spin axis orientation of the body essentially fixed and stable relative to the orbital plane. The preferred embodiment comprises sele... | 07/19/1988 |
| 4757292 | Microwave window A low noise coaxial microwave window of particular utility in hermetic and high power applications, having a metallic center conductor, a metallic outer support, and a ceramic support brazed between the two conductors. The brazed joints are specially prep... | 07/12/1988 |
| 4757325 | Method for designing sector beam antennas An improved method for designing sector beam antennas. The method is used to provide a sector beam antenna having a feed horn with a cross sectional azimuth dimension and a cross sectional elevational dimension which are optimized to irradiate a reflector... | 07/12/1988 |
| 4754496 | Test and measurement system for antennas A test and measurement system for space satellite antennas which includes frequency synthesizers which are capable of shifting from frequency to frequency at high speeds with precision accuracy to provide source and reference frequencies with which the an... | 06/28/1988 |
| 4754449 | Wide bandwidth device for demodulating frequency division multiplexed signals A device for transforming N-Frequency Division Multiplexed (FDM) channels (21) of modulated signals into individually accessible streams (46) of demodulated data employs a Fourier transform processor (10) to transform the N-FDM channels into a single, TDM... | 06/28/1988 |
| 4753683 | Gallium arsenide solar cell system A solar cell array utilizing geometrically alternating, laterally disposed N-on-P and P-on-N gallium arsenide solar cells is disclosed. Improved array efficiency is achieved by placing adjacent solar cells in substantial contact with each other and elimin... | 06/28/1988 |
| 4753506 | Off axis optical communication system An improved optical rotary joint is achieved by transmitting information in the form of an optical signal from a part of the de-spun portion outside the rotational axis to create on the spun portion, or vice versa, 360° about the rotational axis, a conti... | 06/28/1988 |
| 4752884 | Precision platform pointing controller for a dual-spin spacecraft A pointing apparatus for a dual-spin spacecraft utilizing a first sensor for sensing the time of arrival of an inertial attitude reference as the spinning portion of the spacecraft rotates, and a second sensor for sensing the time of arrival of an index r... | 06/21/1988 |
