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| Number | Title | Issue Date |
| 4598224 | Surface acoustic wave device for sensing the presence of chemical agents A surface acoustic wave device is provided for sensing the presence of chemical agents by chemo-electronic means. The device includes a quartz substrate and means deposited on the substrate for propagating and receiving surface acoustic waves along the su... | 07/01/1986 |
| 4592058 | Frequency stabilized laser A frequency control system for a laser for compensating for thermally-induced laser resonator length changes. The frequency control loop comprises a frequency reference for producing an error signal and electrical means to move a length-controlling transd... | 05/27/1986 |
| 4581767 | Measurement of jamming effectiveness by cross correlation techniques (C) A method and apparatus is disclosed for automatically and repeatably measng the effectiveness of jamming applied against a communications link. The method is machine performed, free of the need of listener personnel, and the recording and scoring tasks r... | 04/08/1986 |
| 4568915 | Code generator for multilevel interleaved multiplexed noise codes Expanded multilevel noise codes are generated of a type termed "code mates" aving autocorrelation functions which, upon detection in a matched filter, provide an impulse autocorrelation function. More particularly, expanded multilevel code mate pairs are g... | 02/04/1986 |
| 4568914 | Expanded multilevel noise code generator employing butting Expanded multilevel noise codes are generated of a type termed "code mates" aving autocorrelation functions which, upon detection in a matched filter, provide an impulse autocorrelation function. More particularly, expanded multilevel code mate pairs are g... | 02/04/1986 |
| 4542515 | Multilevel mate pair code compressor for codes expanded by the process of butting Multilevel code mates A and B expanded in accordance with the expression , bK and B=aK, b are compressed to a lobeless basic mate pair by repeatedly compressing corresponding code mate pairs in successive stages to provide diminishi... | 09/17/1985 |
| 4484327 | Pulse code modulation rate converter A pulse code modulation rate converter is described for interfacing into a ommunication system, apparatus designed for operation at two different, and specific, transmission rates.... | 11/20/1984 |
| 4475215 | Pulse interference cancelling system for spread spectrum signals utilizing active coherent detection A pulse interference cancelling system for spread spectrum signals utilized in a digital noise coded communications system. The system includes a first and second noise coded signal channel located in a noise coded signal receiver which also includes a de... | 10/02/1984 |
| 4475214 | CW Interference cancelling sytem for spread spectrum signals utilizing active coherent detection A noise coded communications system which eliminates continuous wave (CW) interference while providing no loss or degradation of the desired signal includes the variable delay line and a linear adder coupled to the output of the front end section of a mul... | 10/02/1984 |
| 4475186 | Multiplexed noise coded switching system A switching system for performing line to line or group to group switching of communication signals modulated by multiplexed noise codes. The noise codes comprise a subclass or set of multiplexed noise codes consisting of code mate pairs which provide an ... | 10/02/1984 |
| 4472815 | Pulse interference cancelling system for spread spectrum signals Cancellation of pulse interference with no loss in the received level of the desired signal is obtained for a spread spectrum system which utilizes orthogonal multiplexed noise codes which when orthogonally multiplexed, matched filter detected and linearl... | 09/18/1984 |
| 4472814 | CW Interference cancelling system for spread spectrum signals Substantially complete cancellation of continuous wave or slowly varying continuous wave interference with no loss in the received level of the desired signals is provided for a spread spectrum system which utilizes orthogonal multiplexed noise codes whic... | 09/18/1984 |
| 4471342 | Pulse compressor for multiplexed noise codes A pulse compressor for multiplexed noise codes generated with transposed code mate pairs and which comprise expanded noise codes of the code mates where the first expanded code is generated by delaying the inverse of one code mate by a predetermined time ... | 09/11/1984 |
| 4470138 | Non-orthogonal mobile subscriber multiple access system An adaptive interference cancelling system for multibit spread spectrum noise codes wherein a plurality of users in a mobile subscriber access system each operates with a different noise code. Each user receives a composite signal which includes a desired... | 09/04/1984 |
| 4460992 | Orthogonal CDMA system utilizing direct sequence pseudo noise codes An orthogonal code division multiple access communications system is disclosed involving multiple users while providing orthogonal operation, meaning that there is substantially zero interference between users. All of the users employ a mutually different... | 07/17/1984 |
| 4458218 | Dielectric waveguide reciprocal ferrite phase shifter A dielectric waveguide reciprocal ferrite phase shifter is provided for use n a dielectric waveguide transmission line. The phase shifter is comprised of a length of ferrite of the same cross-sectional dimension as that of the dielectric waveguide and in f... | 07/03/1984 |
| 4455631 | Seismic parameter measurement method and apparatus The apparatus comprises a geophone connected to a circuitry case containing battery, a voltage regulator, a solid state preamplifier and amplifier tuned to respond to seismic signals between 2 and 25 Hz. The amplified seismic signals are rectified and app... | 06/19/1984 |
| 4442407 | Two loop automatic level control for power amplifier The power supply potential applied to the final stage of an RF amplifier is odulated by means of an adaptive power supply. The power supply potential applied to the final RF amplifier is controlled by a first control loop in accordance with an error signal... | 04/10/1984 |
| 4434505 | Interference cancelling system for a mobile subscriber access communications system Undesired intentional interference, i.e. jamming signals in a multiple acsing mobile subscriber system employing a plurality of subscriber communication terminals, selectively transmitting and receiving desired signals from one another via a central node... | 02/28/1984 |
| 4410902 | Planar doped barrier semiconductor device Disclosed is a majority carrier rectifying barrier semiconductor device housing a planar doped barrier. The device is fabricated in GaAs by an epitaxial growth process which results in an n+ -i-p+ -i-n+ semiconductor stru... | 10/18/1983 |
| 4375594 | Thyratron Marx high voltage generator Thyratrons are used as the switching devices for connecting capacitive storage devices in series after they have been charged in parallel. In the preferred embodiment, the capacitive device is placed before the thyratron in each stage, so that the output ... | 03/01/1983 |
| 4375027 | Dual chambered high pressure furnace The high pressure furnace comprises a cylindrical pressure vessel with fr and rear pressure closures. An electrical heating element is supported within the interior of the pressure furnace. The front closure supports a relatively thin-walled inner contai... | 02/22/1983 |
| 4371884 | InAs-GaSb Tunnel diode Disclosed is a tunnel diode consisting of an accumulation region of p-type GaSb and an accumulation region of n-type InAs separated by a thin layer of a quaternary compound consisting of InGaSbAs. Such a diode structure converts the interface between the ... | 02/01/1983 |
| 4370655 | Combined side lobe canceller and frequency selective limiter A radar system having means for effectively eliminating or cancelling intering signals characterized by the side lobes of the radar antenna received signals. An adaptive side lobe canceller system is combined with a frequency selective limiter such that ... | 01/25/1983 |
| 4359743 | Broadband RF isolator A broadband RF isolator system for connection between RF devices such as inear antennas is disclosed. In accordance with this invention, two or more antennas are spaced several wavelengths apart, connected to coaxial feeds and choked at their adjacent en... | 11/16/1982 |
| 4319225 | Methods and apparatus for compacting digital data Apparatus is disclosed for implementing a unique data compaction technique hich is capable of significantly reducing the storage requirements for alpha-numeric data-sets. The results of a computer simulation which demonstrates the power of this technique a... | 03/09/1982 |
| 4316195 | Rotating dual frequency range antenna system Disclosed is an antenna system designed to operate in two frequency ranges imultaneously, namely S-band (1660 to 1700 MHz) and X-band (8500 to 9600 MHz). The system comprises two separate antennas which are conically scanned and share a common parabolic re... | 02/16/1982 |
| 4310812 | High power attenuator and termination having a plurality of cascaded tee sections An attenuator and termination having a relatively flat frequency response r attenuating and dissipating electrical energy is comprised of a plurality of cascaded tee attenuator sections formed on a substantially flat surface ceramic substrate comprised of... | 01/12/1982 |
| 4281250 | Radiation dose rate meter A combined dose rate meter and charger unit therefor which does not require he use of batteries but on the other hand produces a charging potential by means of a piezoelectric cylinder which is struck by a manually triggered hammer mechanism. A tubular typ... | 07/28/1981 |
| 4280128 | Adaptive steerable null antenna processor An adaptive signal processing system for enhancing the signal-to-interfere characteristics on both receive and transmit using an in phase-quadrature correlator to control phase and amplitude adjust circuits located in the antenna signal paths. The amplit... | 07/21/1981 |
| 4263702 | Method of making a quartz resonator A quartz resonator is made from a chemically polished quartz plate. The plate is placed in an enclosure fitted with at least three mounting clips to receive the plate. The plate is secured to the clips with an electrically conductive adhesive capable of w... | 04/28/1981 |
| 4250515 | Heterojunction superlattice with potential well depth greater than half the bandgap A superlattice structure is disclosed in which alternating layers of semiductor alloy materials provide a one dimensional spatial periodic variation in band edge energy. A first layer of the superlattice device is an alloy including a first Group III mat... | 02/10/1981 |
| 4247358 | Method of growing single crystals of alpha aluminum phosphate Single crystals of alpha aluminum phosphate of high crystal perfection are rown from seeded solutions of aluminum orthophosphate and orthophosphoric acid in such a manner as to provide direct visual observation of the crystal growth process and allow preci... | 01/27/1981 |
| 4247775 | Piezoelectric dosimeter charger Disclosed is a small portable extremely rugged charger for existing pockeized type radiation dosimeters. The charger is comprised of a rectangularly shaped housing which contains a piezoelectric charging circuit which is manually operated by a handle to ... | 01/27/1981 |
| 4233394 | Method of patterning a substrate A substrate is patterned by first dissolving polymethacrylonitrile in a spinning solvent that will dissolve the polymer and form a viscous solution. The solution is then applied to the surface of the substrate and the substrate spun to form a smooth, unif... | 11/11/1980 |
| 4223180 | Human speech envelope tracker This invention recovers the time waveform envelope of a human voice signal ithout the loss of subtleties providing speaker recognition cues and voice quality. This is accomplished by rectifying the voice envelope and then obtaining slope information about ... | 09/16/1980 |
| 4219891 | Countermeasures system 1. A method for jamming frequency-shift-keyed radio teletype signals which omprises: receiving said frequency-shift keyed signals; converting said signals to teletype current pulses; modification of selected ones of said teletype pulses; converting said mo... | 08/26/1980 |
| 4217585 | Dual frequency Doppler radar A dual frequency moving target radar system having a lower frequency chan which provides relatively good moving target detection in the presence of such obstacles as foliage and precipitation and a higher frequency channel which provides accurate locatio... | 08/12/1980 |
| 4217591 | High frequency roll-bar loop antenna A vehicular mounted loop antenna which operates as an NVIS radio communicon antenna over one range of frequencies and as a vertically polarized whip antenna over another range of frequencies corresponding to the frequency range of a radio communication s... | 08/12/1980 |
| 4216445 | Variable resistance attenuator Four PIN diodes are connected, two in parallel oppositely directed at each f two ports of a 3 dB, quadrature hybrid which equally divide the power from an input port. The mismatch produced by the PIN diode resistance in parallel with the matching load resi... | 08/05/1980 |
