| Patent Number |
Title Of Patent |
Date Issued |
| 4710767 |
Method and apparatus for displaying multiple images in overlapping windows |
December 1, 1987 |
| A circuit is provided which receives pixel data and pixel addresses from a graphics processor and effectuates rapid clipping of image information lying outside of a corresponding window, and also provides a template memory for storing information corresponding to all areas of that window |
| 4710630 |
Optical detection system |
December 1, 1987 |
| An optical system to permit two detectors to see the same field of view includes an angle converting cone, for mixing radiation from a field of view so that it can be applied to two detectors, and a lens for focusing the radiation onto the cone. |
| 4709239 |
Dipatch antenna |
November 24, 1987 |
| A vertically polarized omnidirectional antenna adapted for use in airborne, Very High Frequency (VHF) applications is disclosed. The antenna is configured as a conductive patch spaced over its virtual image. The addition of a number of switching devices allows operation over a five-t |
| 4705414 |
Printhead mounting and movement control assembly |
November 10, 1987 |
| An assembly for positioning a print head so as to transfer ink from an ink ribbon to a printing medium positioned on a movable platen adjacent to said ribbon supports the print head on a rocker member which enables the head to be swung between a print position wherein it engages the ink |
| 4703462 |
Virtually steerable parametric acoustic array |
October 27, 1987 |
| The invention concerns an application of linear system parameter estimation techniques to finite amplitude sonar devices, to extract fine grained angular position information about echo sources. The invention makes use of the fact that the waveform return by a reflecting object within th |
| 4701924 |
Frequency discriminating laser |
October 20, 1987 |
| A laser which discriminates against a high gain transition in laser materials allowing a low gain transition to oscillate is provided by using more than two mirrors in the laser cavity which are highly reflective at the frequency of the high gain transition. |
| 4701762 |
Three-dimensional electromagnetic surveillance system and method |
October 20, 1987 |
| A surveillance system for simultaneously identifying the directions and frequencies of a plurality of electromagnetic-radiation sources includes an irregular array (10) of antenna elements and employs a two-dimensional compressive receiver (14) that receives at its input ports (18) the |
| 4694411 |
Simulation apparatus and method |
September 15, 1987 |
| A method and apparatus for simulating a network comprising a plurality of processing elements useful in simulating, for example, complex digital combinatorial electronic logic circuits. Each type of digital logic element is assigned a symbol, and the symbols are stored in an array pa |
| 4692683 |
Optical power distribution system |
September 8, 1987 |
| An optical power distribution system for supplying power to low power electrical devices includes an electrically powered source of optical radiation the output of which is applied to a photovoltaic cell array arranged on the device to be powered and electrically connected thereto. |
| 4691605 |
Cutter assembly with rotating knife blade |
September 8, 1987 |
| A cutter assembly (82) for cutting web material such as paper (80) includes a circular cutter (100) having an endless peripheral blade (102) mounted on a frame (92) on which also is mounted a tension roller in the form of a pulley (94). A smaller pulley (98) is mounted on and co-axial wi |
| 4689762 |
Dynamically configurable fast Fourier transform butterfly circuit |
August 25, 1987 |
| A decimation-in-frequency fast-Fourier-transform butterfly circuit for performing a radix-four butterfly operation includes a first group of adders (86, 88, 90, and 92), a second group of adders (70, 72, 74, and 76), and a group of twiddle-factor multipliers (78, 80, and 82) that are |
| 4688003 |
Feed-forward error correction for sandaps and other phase-locked loops |
August 18, 1987 |
| A signal source in the general form of a phase-locked loop (12, 20, 22, and 24) has its output fed to a phase modulator (32) controlled in response to the output of the phase-locked-loop phase detector (20). This provides feed-forward error correction that gives the signal source a faste |
| 4682338 |
Multi-lamp laser pumping cavity |
July 21, 1987 |
| An optically pumped solid-state laser system includes a rod (50) of laser material and a plurality of flashlamps (66) for pumping the laser. A surface for reflecting radiation from the flashlamp (66) to the rod (50) follows a set of curves (96). Each curve (96) is the locus of points who |
| 4677587 |
Program simulation system including means for ensuring interactive enforcement of constraints |
June 30, 1987 |
| An interactive simulation system for simulating an analog or a digital system defined by mathematical model representing the operation of the system. The mathematical model is represented by a network of function blocks specified by an operator, each function block providing an output |
| 4677572 |
Pen turret control system |
June 30, 1987 |
| A control system for controlling a turret head in a pen plotter wherein the turret head and pen holder move in combination with the pen carriage to provide turret selectability at the writing site. Sensors and associated logic are provided for detecting the presence of a turret on the pe |
| 4673304 |
Thermal printer ribbon cartridge for wide ribbons |
June 16, 1987 |
| A user-friendly ribbon cartridge to house and to facilitate handling a wide thermal transfer ribbon for a thermal color printer is composed of first and second casing sections which define a slotted let-off tube and a slotted take-up tube and turnbar. A pair of casing end pieces connect |
| 4664135 |
Pilot valve |
May 12, 1987 |
| A pilot valve suited for use as the first stage of a large hydraulic valve system. The pilot valve virtually eliminates the steady state fluid leakage associated with orifice-based prior art systems. A pair of low noise and long life fluid restrictors are employed having flat openings |
| 4662726 |
Reflective optical element |
May 5, 1987 |
| An optical element includes an ogival reflective surface which diverges an incident radiant energy beam substantially uniformly into a 2.pi. solid angle. The precise shape of the reflective surface is defined mathematically in relation to the desired solid angle of divergence and ene |
| 4659874 |
X-Y position sensor |
April 21, 1987 |
| In a sketch pad embodying the present invention, the sensing pad has an array of generally parallel pairs of adjacent sensing conductors which, for the purpose of this explanation, will be condidered as extending in the horizontal or X direction. Each conductor has a generally triangular |
| 4656642 |
Spread-spectrum detection system for a multi-element antenna |
April 7, 1987 |
| In a spread-spectrum direction-finding system, the outputs of the several antenna elements (10a-d) are progressively translated in frequency by a chirped local oscillator (14) and mixers (12a-d) and applied to a two-dimensional dispersive filter (18), which time compresses the results |
| 4654700 |
Optical decoder |
March 31, 1987 |
| An optical decoder to permit differentiating between at least two flashing spots displayed on a cathode ray tube screen is provided by a photosensor and an electrical circuit which is responsive to the absence of flashes during a flashing sequence which is different for the two spots and |
| 4654667 |
Signal-acquisition system for a circular array |
March 31, 1987 |
| A signal-acquisition system (10) for a circular antenna array (12) includes a two-dimensional compressive receiver (18) that performs a two-dimensional Fourier transformation in time and position on the outputs of the array. Each of the outputs of the compressive receiver (18) is fed |
| 4649392 |
Two dimensional transform utilizing ultrasonic dispersive delay line |
March 10, 1987 |
| The invention of this disclosure comprises a system that simultaneously determines the frequency and direction of arrival of incoming signals. The apparatus of this invention comprises a layered half space dispersive delay line which is utilized as a beam forming element in a device that |
| 4646644 |
Pneumatic time delay valve |
March 3, 1987 |
| A pneumatic time delay valve primarily adapted for use in the ejection system of electronic or optical countermeasure devices and the like wherein an explosive squib is employed to create a momentary charge of high pressure gas used to depress the firing pin on the device to activate |
| 4646099 |
Three-dimensional fourier-transform device |
February 24, 1987 |
| Signals from antenna elements (14) of a rectangular array (12) are translated in frequency by mixers (16) fed from a chirped local oscillator (19). The resultant signals are fed to the first of two groups (20 and 36) of two-dimensional delay lines connected in series at right angles to e |
| 4645869 |
Digitizing tablet |
February 24, 1987 |
| A flexible circuit (28) containing the grid connectors of a digitizer tablet (10) converge in a transition region (48) disposed in an unshielded area. However, the positional inaccuracies that would otherwise result from the exposure of the non-parallel conductors to radiation from the |
| 4641143 |
Two-dimensional acquisition system using circular array |
February 3, 1987 |
| A frequency-and-direction-finding system (10) employing a circular array (12) performs a two-dimensional Fourier transformation in space and time on the signals from the individual elements. The results of the transformation are fed to multipliers (22) that multiply them by correctio |
| 4636972 |
Method and apparatus for digital filtering |
January 13, 1987 |
| A receiver employs fast-Fourier-transform modules to process the received signals in the frequency domain. It samples the input signal at a high sampling rate to cover a broad input bandwidth, but it transforms the sampled input signals in short segments, segments that cover time dur |
| 4635278 |
Autoregressive digital telecommunications system |
January 6, 1987 |
| In a digital communications system, one of two tones is selected for each bit, a first tone for a "0" and a second tone for a "1"; the tones are unique for each bit. The tones for all of the bits of a byte are sent simultaneously, in a burst or pulse. At the receiver, a parametric mo |
| 4633257 |
Acquisition system employing circular array |
December 30, 1986 |
| A system for indicating the direction of a source of radio waves received by a circular antenna array (12) includes a Butler matrix (18) that receives the array outputs and feeds the resultant matrix outputs to correction circuits (22) whose transfer functions are the inverses of the |
| 4631543 |
Method and apparatus for reducing the effects of impulse noise in Loran-C receivers |
December 23, 1986 |
| The effects of impulse noise on the operation of a microprocessor-controlled Loran-C receiver are reduced by muting or attenuating the received signals in the front end of the receiver ahead of the receiver gain during a time period which preceeds the start time of the pulses being t |
| 4631420 |
Dynamic flip-flop with static reset |
December 23, 1986 |
| A D-type flip-flop (10) receives the D input on an input line (14) of a transfer gate (12) that also receives the flip-flop clock signal. A state gate (20) forwards the transmission-gate output when the signals on two of its input lines (22) and (24) remain true. To reset the flip-flop |
| 4628477 |
Programmable push-pop memory stack |
December 9, 1986 |
| A data stack for storing data at sequential locations in a memory and for transmitting the data in modes defined by commands from a host data processing system. A random access memory stores the data in sequential locations at addresses selected by a state signal generator comprising |
| 4627754 |
Drum clamping mechanism for a printer |
December 9, 1986 |
| A mechanism for clamping the leading edge of a sheet to be wrapped around a printing drum for printing in a plurality of colors includes a clip that is movably mounted in the drum so that it can be moved between an open position and a clamping position, the clip being biased to its clamp |
| 4621535 |
Forward engagement and reverse disengagement device |
November 11, 1986 |
| A drive roll 14 carries a gear (60) that engages a reversing gear (58) driven by a planetary gear (56) on a pivot arm (50). The planetary gear (56) is driven by a sun gear (48) that rotates about the pivot axis of the pivot arm (50) and in turn is driven ultimately by a motor (30). A |
| 4614922 |
Compact delay line |
September 30, 1986 |
| A precision microwave delay line fabricated using stripline techniques, but having features of a coaxial transmission line. The delay line is assembled from three pieces: a center board, an upper housing, and a lower housing. The center board is a nonconductive substrate with a stripline |
| 4604723 |
Bit-slice adder circuit |
August 5, 1986 |
| A bit-slice adder circuit for adding a plurality of input numbers in binary form. A tally circuit receives all of the bits from a bit position of all of the numbers and identifies the number of "ones" in that bit position. This information is coupled as address signals to a memory, which |
| 4604626 |
Acquisition system employing circular array |
August 5, 1986 |
| A phase-angle circuit (24) processes the outputs of an antenna array (12) to apply to a compressive receiver (20) an ensemble of signals having components whose spatial frequencies are proportional to the bearing angle of the electromagnetic plane waves that give rise to them. A signal w |
| 4600846 |
Universal logic circuit modules |
July 15, 1986 |
| Universal logic circuit cells for use in designing and laying out electronic circuits. The cells provide AND and OR on other logical functions on input signals, and include a conventional AND or OR gate, or other logic gate, and associated input and output connections and circuitry t |
| 4594672 |
Multi-column plotter |
June 10, 1986 |
| A graphics drum plotter in which wide strip paper is divided into virtual columns. An operator interface is provided whereby an operator can define the size and number of columns across the strip paper. Instead of producing a series of small plots along one edge of the wide strip, the |
| 4594597 |
Thermal printer |
June 10, 1986 |
| A thermal printer of the three-pass variety for printing in color featuring a sheet feeder, automatic registration, and ejection of the sheet when printing is complete. A rotatable, cylindrical drum has the print head close adjacent thereto and includes a releasable clamp for receiving t |
| 4594595 |
Circular log-periodic direction-finder array |
June 10, 1986 |
| A circular frequency-independent antenna array (10) includes a plurality of radially extending log-periodic subarrays (12, 14, 16, 18, 20, and 22) of slot radiators (26) provided in a ground-plane conductor (28). Associated with each slot is a cavity (34) into which the slot opens. A |
| 4593293 |
X, Y plotter |
June 3, 1986 |
| An X, Y plotter particularly adapted to use both cut paper and strip paper. A driven roller provides motion of the paper back and forth according to one signal. A moveable pen block containing the pen is moved transverse the path of the paper in response to the second signal, thus provid |
| 4590478 |
Multiple ridge antenna |
May 20, 1986 |
| A microwave antenna (10) is excited by two independently driven feed lines (30 and 32) so that the plane of polarization of the resultant microwave radiation depends on the relative amplitudes of the signals on the two feed lines. The feed lines are disposed between two parallel ground p |
| 4585960 |
Pulse width to voltage converter circuit |
April 29, 1986 |
| A low-loss, low-cost passive pulse width to voltage converter is provided by utilizing a diode clamp having a resistor in series therewith to provide a soft clamp or integrating clamp. |
| 4585139 |
Cooperating cover mechanisms |
April 29, 1986 |
| The housing (12) of a printer-plotter (10) includes a top cover (14) and a front cover (30) on adjoining housing walls. The top cover (14) is biased toward its open position by a gas spring (20) that is held closed by cooperating latch mechanisms on the top cover (14) and the front cover |
| 4584664 |
Sorting apparatus |
April 22, 1986 |
| Apparatus for sorting two input numbers including a memory that iteratively receives a digit from both of the numbers and transmits output signals corresponding to the input digits, the digits of the larger number being transmitted on one output line and the digits of the smaller number |
| 4583188 |
Digitally controlled electronic function generator |
April 15, 1986 |
| A new method and apparatus for generating an analog output signal as a function of a digital input in the form of digital words over a specified range. The range is divided into a plurality of intervals, and the function is approximated by a linear segment in each interval. Each linear |
| 4571640 |
Video disc program branching system |
February 18, 1986 |
| A video disc program branching system comprising multiple programs frequency multiplexed on a video disc and co-located substantially in the same portion of the disc wherein branching is achieved by designating specific ones of said multiple programs through frequency band selection. |
| 4568039 |
Guidance system for a projectile |
February 4, 1986 |
| Guidance is provided for a spinning projectile by measuring the magnitude of the angle between the spinning projectile and a target. This information is processed in conjunction with a body rate sensor to deduce the angular rate of the line of sight between projectile and the target. A |
