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| Number | Title | Issue Date |
| 4951521 | Gimbal module A gimbal module for installation in a gimbal assembly and for operation by a simple type of robot device for use in a space environment. The module has a stator, which is fixedly connected to a first gimbal, and has a coaxial rotor, which is fixedly conne... | 08/28/1990 |
| 4882512 | Electromagnetic force sensor An electromagnetic actuator having a sensor for sensing an amount of applied force is provided. The actuator maintains an adjustable force by adjusting a current in its coils. the actuator includes an armature and a stator. The stator has a U-shaped back ... | 11/21/1989 |
| 4665401 | Millimeter wave length guidance system A high frequency target seeking device, using a stabilized reflector antenna, performs range search and tracking functions and target angle search and tracking functions. A technique is provided for target range discrimination using several narrow band i.... | 05/12/1987 |
| 4661937 | Sonar beam steering circuit A multibeam acoustic apparatus utilizing a linear array of hydrophone elements in a sonar system includes a cascaded ladder capacitance-inductance network for coupling electrical signals to and from the individual hydrophone elements. The hydrophone eleme... | 04/28/1987 |
| 4654565 | Apparatus and method of anode power supply control during vertical retrace Apparatus and method for control of an anode voltage power supply for reduction of fluctuation in anode power supply output during the vertical retrace period, resulting in improvements in overall CRT display performance parameters.... | 03/31/1987 |
| 4650266 | Rotary high power transfer apparatus An apparatus for reducing terminal-to-terminal circuit resistance and enhancing heat transfer in a rotary power transfer apparatus of the roll ring type comprising a connecting thimble for attaching an external power cable to a cone shaped terminal which ... | 03/17/1987 |
| 4645992 | Electronically controlled servomotor limit stop A drive circuit for servomotors that eliminates the need for microswitches to protect the motor when the system is driven to its limits of travel. The circuit monitors the current to the motor, identifies overload currents and terminates current flow to t... | 02/24/1987 |
| 4642555 | Differential capacitance detector A differential capacitance detector comprising two pulse generators and a comparator. The width of each pulse generator output is representative of the capacity of each of two capacitors whose differential is to be determined. A comparator provides a thir... | 02/10/1987 |
| 4638229 | Asymmetric torque switching for aircraft autopilot An apparatus for providing asymmetrical torque-switching for an aircraft autopilot. The invention provides an increased amount of available pitch servo torque at high altitude. The direction of pitch of the aircraft is sensed. An increased amount of torqu... | 01/20/1987 |
| 4637619 | Concentric seal rings A plurality of concentric sealing rings on the face of a static sealing surface provides a positive seal when used with Teflon film or like materials that have a tendency to cold flow under pressure into recesses created by the concentric sealing rings.... | 01/20/1987 |
| 4636636 | Microwatt battery powered optical sensor A battery powered optical sensor, capable of functioning for a period of time approximately equal to the shelf life of the battery, utilizes an LED driven by an optical transducer and biased by the battery at a level that exceeds the shot noise level of t... | 01/13/1987 |
| 4634858 | Variable coupler fiberoptic sensor A variable coupler fiberoptic sensor in which a fused, tapered, biconical directional fiberoptic coupler is encapsulated in a stress birefringent medium whose index of refraction changes with applied stress. The ratio of power in the output fibers of the direc... | 01/06/1987 |
| 4633404 | Automatic deceleration of aircraft during descent Deceleration control apparatus for an aircraft having an automatic altitude capture and hold system and an airspeed hold system, both systems controlled by controlling pitch attitude wherein during a descent from a higher altitude under airspeed-on-pitch ... | 12/30/1986 |
| 4633143 | Convergence correction apparatus for delta-gun color cathode ray tube displays Convergence correction for a delta-gun CRT at all locations on the CRT screen is accomplished by separately implementing the general equation for convergence in that coordinate system peculiar to each of the gun's location relative to the screen and modif... | 12/30/1986 |
| 4631540 | Angular position to linear voltage converter An apparatus for converting angular position to a linear voltage. A continuous element dual wiper potentiometer provides triangular waveforms 90° apart to a waveform conversion circuit which generates a linear positive going ramp waveform in response to ... | 12/23/1986 |
| 4623966 | Collision avoidance apparatus Apparatus for assessing maneuvers of a first vehicle (6) so fitted relative to other vehicles (58, 68, 71-74) comprises sensing means for providing signals representative of the positions and velocities of the other vehicles relative to the first vehicle ... | 11/18/1986 |
| 4618865 | Dielectric trough waveguide antenna A dielectric trough waveguide antenna composed of a metallic guide having a dielectric substrate covering the bottom of the guide and a plurality metal radiators placed periodically on the dielectric at the dielectric-air interface provides a low loss ant... | 10/21/1986 |
| 4613978 | Narrowband interference suppression system Strong narrowband signals interfering with the reception of a desired broadband signal in systems such as spread spectrum systems are continuously suppressed by converting the received signal to a frequency-domain representation thereof wherein strong nar... | 09/23/1986 |
| 4609988 | Automatic prediction and capture of a preselected altitude for aircraft An improved flight control system for initiating and thereafter controlling the automatic capture of a preselected altitude is described. At any point in the flight and in any autopilot pitch submode, the remaining time before an altitude capture is to co... | 09/02/1986 |
| 4603389 | Three cue flight director system for helicopters A full time three-cue (roll control, pitch control and collective control) for helicopters flight director and/or autopilot wherein the collective control cue is automatically activated when airspeed is below a predetermined low value or above such value ... | 07/29/1986 |
| 4603388 | VTOL altitude hold system with automatic ground effect compensation During a transition of a VTOL aircraft such as a helicopter, from one altitude held without its ground effect zone to another to be held within its ground effect zone, or vice versa, a collective stick position synchronizer which can memorize the proper t... | 07/29/1986 |
| 4595830 | Multimode optical fiber accelerometer An apparatus for sensing acceleration utilizes a multimode input optical fiber to provide an output of light which passes through a grating, and is collimated by a grinrod lens. The collimated light is reflected from a double faceted reflecting surface in... | 06/17/1986 |
| 4593285 | Windshear detection and warning system with evasion command A windshear warning apparatus which separately compares a plurality of signals derived from horizontal and vertical inertial acceleration and air mass acceleration components to indicate incipient windshear. The compared signals are substantially equal un... | 06/03/1986 |
| 4575697 | Electrically controlled phase shifter A microwave phase shifter for use in waveguide transmission line employs a piezoelectric cantilevered bimorph member mounted on the waveguide and a thin wafer of dielectric material mounted on the free end of the cantilever above a slot in the waveguide. ... | 03/11/1986 |
| 4570182 | Halo generator for CRT display symbols An apparatus for generating halos about CRT display symbols, to distinguish them from background video, reads, from an image memory, video Bit signals corresponding to a CRT picture element PI,J, and the immediately surrounding CRT picture elem... | 02/11/1986 |
| 4569052 | Coset code generator for computer memory protection An apparatus for protecting computer memory utilizes a parity matrix to generate an n-k check bit signal of an extended linear (n,k,4) code from a k data bit signal. Exclusive-OR gates add the n-k check bit signal to an n-k tag bit signal selected from a ... | 02/04/1986 |
| 4556791 | Photoelastic sensor using a variable intensity light source as a feedback means Light from an external source is collimated, polarized, passed through a voltage dependent quarterwave plate and onto an elasto-optic sensor which serves to retard the light passing therethrough as a function of the external stress being measured. Light e... | 12/03/1985 |
| 4556960 | Address sequencer for overwrite avoidance An address sequencer utilizes binary words generated by Exclusive-OR addition of Gray code words to linear code words to produce a sequence of computer or memory addresses such that the addresses whose indices lie within a selected range of the index of a... | 12/03/1985 |
| 4553143 | Low cost panel display addressing structure A flat panel display in which photoresistive dividers on a first substrate are coupled to the leads of an optical display on a second substrate, such as an electroluminescent panel, by means of elastomeric connectors for coupling the photoresistor conduct... | 11/12/1985 |
| 4553214 | Angle based stroke generator Stroke display apparatus generates symbols or characters on a display screen and permits dynamic rotation or translation of those characters without placing a computation burden on the host processor. The characters are represented as a series of connecte... | 11/12/1985 |
| 4551728 | Apparatus for rapid switch conical scan feed An apparatus for rapidly starting and stopping a conical scan antenna beam in which a feed rotating about a centerline provides a non-conical scan antenna beam during a search mode. When a target is detected a solenoid moves an actuator pin which displace... | 11/05/1985 |
| 4551826 | Multiple beam lens transducer with collimator for sonar systems A compact apparatus for transmitting and receiving multiple sonar beams utilizes an acoustic lens to direct plane waves incident in desired directions to collimating lenses for presentation in phase to electroacoustic transducers having planar surfaces. T... | 11/05/1985 |
| 4537382 | Sway rod suspension system In a suspension system for a gyrocompass or similar device, a plurality of sway rods, springs and shock snubbers are combined to isolate the gyrocompass or similar device from vibrations having low frequencies in all directions.... | 08/27/1985 |
| 4536733 | High frequency inverter transformer for power supplies A low leakage inductance inverter transformer utilizing a torodial ferrite core having a primary winding wound thereon, with the secondary winding constructed from stamped conductive clips ranged to encompass portions of the core and primary winding with ... | 08/20/1985 |
| 4533915 | Radar terrain signal suppressor An apparatus for the suppression of terrain generated clutter in a pulsed weather radar system. Weather induced returns typically having scintillation frequencies greater than 50 Hz may be isolated from terrain backscattered signals utilizing a digital fi... | 08/06/1985 |
| 4529836 | Stress absorption matrix An apparatus for interfacing materials and absorbing disparate thermal expansions thereof utilizes a woven wire mesh to support a predetermined thickness of a first soft solder which absorbs expansions, and utilizes a second soft solder having a lower mel... | 07/16/1985 |
| 4524443 | High speed solid state multiplexer A multiplexing apparatus for outputting selected input signals utilizes input transistors coupled between input sources and diodes. A first set of switching transistors, coupled to the input transistors and the diodes, blocks the outputting of nonselected... | 06/18/1985 |
| 4521974 | Temperature stable arcuate bubble gravity sensor mount A temperature stable apparatus for mounting an arcuate glass enclosed electrolytic bubble gravity sensor utilizes epoxy cement having a low temperature coefficient of expansion for bonding an end face of a post having a temperature coefficient of expansio... | 06/11/1985 |
| 4517567 | Radar trigger and pretrigger generator having delay sensing and compensating circuit The radar trigger and pretrigger generator determines the inherent component time delay through the radar modulator and transmitter during a first cycle of operation. During the next cycle of operation a pretrigger pulse is generated after a time correspo... | 05/14/1985 |
| 4513025 | Line emission penetration phosphor for multicolored displays A single particle penetration phosphor employs La2 O2 S:Tb particles as a core particle having a thin layer of La2 O2 SO4 :Tb formed thereon by oxidation to provide a barrier which must be penetrated ... | 04/23/1985 |
