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| Number | Title | Issue Date |
| 6454063 | Tuned mass damper with tunable damping and anti friction rolling mass A container with an inside surface and a mass mounted for oscillation in the container with a pair of bellows in the container each having a bias spring therein and a removable end to expose the interior of the bellows to exchange the spring for easy tuni... | 09/24/2002 |
| 6415674 | Gear transmission damping apparatus and method A gear drive having a third order damper operating with the antibacklash gear so as to lower the impact of the antibacklash gear at high torques to reduce gear wear while maintaining good contact with the antibacklash gear at lower torques to maintain hig... | 07/09/2002 |
| 6278247 | Multi-resolution drive for actuators An actuator positioned in accordance with two signals, the first being predominant and having a noise portion of magnitude which would mask the second signal and wherein the first signal is filtered to remove the noise and is connected to the actuator ind... | 08/21/2001 |
| 6182582 | Tilt table Two wedge-shaped platforms, each rotatable about a different axis, are rotationally mounted together so that a pointing device mounted on one of the platforms can be made to point in a desired direction by predetermined rotational positioning of the two p... | 02/06/2001 |
| 6129185 | Magnetically destiffened viscous fluid damper Disclosed is a vibration damping and isolation apparatus having a passive damping mechanism. The passive damping mechanism includes a piston and first and second elements of magnetic material with a shaft extending therebetween. The piston and shaft are l... | 10/10/2000 |
| 6082508 | Pneumatic damping strut A vibration isolator which uses a compressible fluid such as air within a pair of flexible chambers interconnected by a restrictive passage, with one of the chambers connected between a first member which may vibrate and a second member which is to be iso... | 07/04/2000 |
| 6065741 | Pneumatic isolator element A substantially friction free mounting is presented utilizing a plurality of balls which are placed one each in a plurality of grooves between two members that are relatively movable, and a plurality of magnets are placed near the center of each groove to... | 05/23/2000 |
| 6018701 | False null prevention in optical delay line calibration A method and apparatus for preventing false nulls in an optical delay line by causing the input optical beam to be frequency modulated or variably time delayed so that the components of the optical signal in the output cannot be of equal magnitude and of ... | 01/25/2000 |
| 5969672 | GPS signal fault isolation monitor A system to determine, from inertial reference apparatus and from GPS receiver apparatus, acceleration signals along a predetermined axis to determine the failure of a GPS satellite signal by comparison of the acceleration signals and to monitor newly acq... | 10/19/1999 |
| 5947240 | Load vibration isolation apparatus A damping mounting structure for use between two members for isolating motion changes which incorporates a plurality of dampers connected between the two members in a closed geometric shape and which uses cross connections between the dampers located on o... | 09/07/1999 |
| 5944761 | Variable periodic disturbance rejection filter A filter for use in an attitude control system which may be subjected to vibrations from disturbances which have frequency contents that vary with time. Sensors on the system produce signals that contain the disturbance frequencies and a calculator connec... | 08/31/1999 |
| 5943636 | Method and apparatus to calibrate and run optical delay devices A calibrate and run bias voltage control method for an optical delay system utilizing a plurality of voltage controlled switches which may experience bias drift wherein during calibration an output optical power error signal of the system is monitored whi... | 08/24/1999 |
| 5918865 | Load isolator apparatus A damping mounting structure for use between two members for isolating motion changes which incorporates a plurality of dampers connected between the two members in a closed geometric shape and which uses cross connections between the dampers located on o... | 07/06/1999 |
| 5901927 | Ground strike protection function for aircraft autopilot A method and apparatus for use with an aircraft autopilot to prevent an aircraft part from striking the ground during near ground maneuvers by employing a protection circuit between the outer loop and the inner loop of the control chain between the autopi... | 05/11/1999 |
| 5893298 | Precision snap-on knob mechanism A knob securing mechanism secures a knob to a shaft. A uniquely shaped retaining clip attaches in a channel of the knob. The channel intersects a bore in the knob which receives the shaft. The shaft has a groove corresponding to the retaining clip such th... | 04/13/1999 |
| 5875676 | Non colocated rate sensing for control moment gyroscopes A feedback system for use in controlling control moment gyroscopes that are used in positioning a spacecraft where the relative rate of rotation is determined from the difference between the rotation rate of the gimbals of the CMGs and the rotation rate o... | 03/02/1999 |
| 5873438 | Tuned mass damper with tunable damping and anti friction rolling mass A container with an inside surface and a mass mounted for oscillation in the container with a pair of bellows in the container each having a bias spring therein and a removable end to expose the interior of the bellows to exchange the spring for easy tuni... | 02/23/1999 |
| 5864687 | Arinc 629 data receiver system having an interface for providing identification to each of the received data word types A memory interface system is operable with a ARINC 629 terminal controller for directing storage of data message received by the terminal controller into a memory device, and associating with each of the words stored in the memory device a tag word which ... | 01/26/1999 |
| 5852412 | Differential ground station repeater A differential global position system wherein a DGPS ground station encodes signals from a plurality of satellites and transmits the encoded signal with satellite-specific pseudo range error signals and a ground station repeaters located remote from the D... | 12/22/1998 |
| 5844503 | Method and apparatus for avionics management A method and apparatus using a simplified language consistent with air traffic control syntax for inputting, displaying and controlling the operation of a flight management system of an aircraft to comply with the instructions received by the pilot from t... | 12/01/1998 |
| 5841969 | Single bus architecture supporting subsystems of various criticality levels Communications systems architecture using a single shared resource bus to interconnect a plurality of subsystems each handling information having a first predetermined importance level and an error detect wrapper for encoding information to and from each ... | 11/24/1998 |
| 5816373 | Pneumatic tuned mass damper A tuned mass damper incorporating a container with an inside surface, two end portions and a mass mounted for oscillation between the end portions by a pair of bias springs, the two end portions being filled with a compressible gas to reduce the effects o... | 10/06/1998 |
| 5803213 | Heavy load vibration isolation apparatus A damping mounting structure for use between two members for isolating motion changes which incorporates a plurality of dampers connected between the two members with spring members operating in parallel with the dampers to provide stiffness and where the... | 09/08/1998 |
| 5793808 | Digital processing apparatus and method to control multiple pulse width modulation drivers Apparatus and method for controlling a plurality of pulse width modulated devices from a single controller including condition sensors to input the controller, a logic unit to determine the error between the sensed values and the desired values of the con... | 08/11/1998 |
| 5786922 | Dual signal subharmonic carrier for systems with unknown delay A system used with a system having a carrier delay to determine the phase of a signal before the delay and to recover the signal after the delay. Two signals at different frequencies are sent through the system having a carrier delay. One signal will be t... | 07/28/1998 |
| 5775472 | Multi-axis tuned mass damper A tuned mass damper using a single predetermined mass connected to springs of predetermined stiffness along each of at least two directions to absorb energy from a vibrating structure to which it is attached and damp the vibrations in a rapid and efficien... | 07/07/1998 |
| 5760737 | Navigation system with solution separation apparatus for detecting accuracy failures A navigation system, incorporating a unique method for detecting failures and determining an accuracy or error bound, has a receiver for receiving signals from several remote transmitters and a processor for determining a position solution from the signal... | 06/02/1998 |
| 5663732 | Integrity monitoring method and apparatus for GPS and DGPS receivers A fail safe GPS system for an aircraft moving along a desired trajectory within vertical and horizontal limits using first and second redundant GPS receivers a first of which is connected to the avionics equipment of the aircraft and to an alarm and the s... | 09/02/1997 |
| 5631656 | Fail safe system with common mode avoidance A fail operational system including two sets of first and second sensors responsive to different stimuli to produce signals indicative of a condition, and a comparator for comparing the outputs of the first and second sensors to produce a "valid" signal w... | 05/20/1997 |
| 5629692 | Method and apparatus for alerting pilot to transponder antenna failure in a traffic alert and collision avoidance system A system for use with aircraft having a collision avoidance system which employs i) two transponder systems each including two antennas and a selected one of two transponders and ii) a failure warning when a transponder system failure occurs, to permit th... | 05/13/1997 |
| 5623098 | Dual mode single cavity compensation for microwave resonators A microwave resonator, useable for acceleration detection, having a cavity in which a resonant frequency F1 which changes with changes in length of the cavity and with change in crossectional dimensions of the cavity is compensated for changes ... | 04/22/1997 |
| 5616983 | Electrode assembly with lead wire attachment Disclosed is an electrode assembly particularly for electrodes in which the electrode consists of a material which is non-conducive to soldering of an electrical wire thereto. A retaining wing is forcibly fitted on an electrode having a closed circumferen... | 04/01/1997 |
| 5613127 | Separately clocked processor synchronization improvement Processor apparatus for control functions performed in a redundant manner utilizing separate clocks but correcting for mismatch in timing thereof by causing an interrupt of the processing through software to a "hold" status to allow time for any lagging p... | 03/18/1997 |
| 5610616 | Differential GPS ground station system A differential satellite positioning system is configured to include a plurality of satellite positioning system receivers in spatial proximity of one another for determining independent pseudo range values which are processed in accordance with a selecte... | 03/11/1997 |
| 5608393 | Differential ground station repeater A differential ground station repeater in which a plurality of transmitters are utilized to relay information to an aircraft from a single ground station situated to receive satellite information and to transmit the satellite and other information to the ... | 03/04/1997 |
| 5608524 | Coherence collapsed multimode source for a fiber optic gyro A fiber optic gyro utilizing a multimode mode high power laser diode source with the partly reflective mirror to reflect back some light to the source to cause coherence collapse and broaden the line width and employing a long depolarizer connected to the... | 03/04/1997 |
| 5576887 | Head gear display system using off-axis image sources A head gear display system incorporates a simple off-axis optical projection system employing a pair of lenses and an optical combiner for collimating a visual image onto an observer's eye.... | 11/19/1996 |
| 5574647 | Apparatus and method for computing wind-sensitive optimum altitude steps in a flight management system An apparatus and method for determining the best legal flight altitudes, and the best points at which to change to a new legal flight altitude, such that the cost of the flight is minimized, but subject to filtering to prevent excessive changes in altitud... | 11/12/1996 |
| 5572620 | Fault-tolerant voter system for output data from a plurality of non-synchronized redundant processors Disclosed is a data message voter system for data messages from a plurality of loosely synchronized redundant processors. The data message voter system comprises a data receiver associated with each processor for capturing the data message from the proces... | 11/05/1996 |
| 5557284 | Spoofing detection system for a satellite positioning system A pair of antennae in combination with a GPS signal receiver system is employed for detecting the reception of satellite information signals from a spoofing signal transmitter as opposed to those satellite information signals transmitted aboard each of th... | 09/17/1996 |
