Quotables
"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 5168414 | Faulted circuit indicator Error-free, reliable registration of a fault in a power distribution circuit is achieved by a faulted circuit indicator that measures the current in the circuit after a discrete time delay following the detection of an overcurrent condition. A fault is re... | 12/01/1992 |
| 4674609 | Torsional vibration dampening system The transmission of torsional vibrations from a rotating driving shaft, at the output of an internal combustion engine, to a driven shaft, at the input of a manual transmission, are reduced or eliminated by employing a normally-engaged, oil-cooled wet clu... | 06/23/1987 |
| 4639665 | Sensing system for measuring a parameter A parameter, such as the current flowing through a conductor, is measured by initially passing an energizing magnetic flux through a hall element to produce a hall voltage proportional to the sensed parameter. To eliminate temperature, aging and non-linea... | 01/27/1987 |
| 4637621 | Active shock absorbing system for a vehicle A horizontally moving vehicle body may b stabilized and held at a constant vertical level, as its wheels move up and down in response to disturbing forces, by utilizing the kinetic energy of the rotating wheels to create counter forces on the vehicle body... | 01/20/1987 |
| 4633168 | Measuring system for determining the reactance ratio of a pair of reactive devices By simultaneously charging a pair of capacitors from the same low voltage level to the same high reference voltage level, the two charge time durations will be functions of and will be proportional to the capacitances of the two capacitors. A comparison o... | 12/30/1986 |
| 4621227 | Measuring system for determining the capacitance ratio of a pair of capacitors By simultaneously charging a pair of capacitors to the same d-c voltage and then simultaneously discharging those capacitors to the same d-c reference voltage, the two discharge time durations will be functions of and will be proportional to the capacitan... | 11/04/1986 |
| 4608833 | Self-optimizing, capacity control system for inverter-driven centrifugal compressor based water chillers A self-optimizing, capacity control system for a refrigeration system including a compressor, a condenser, and an evaporator, all connected in a closed refrigeration circuit is provided. The compressor includes a plurality of adjustable inlet guide vanes,... | 09/02/1986 |
| 4590771 | Control system for defrosting the outdoor coil of a heat pump By sensing the outdoor ambient temperature and the outdoor coil temperature in a heat pump when the outdoor coil is frost-free, a control system determines the split or difference that will later exist between those temperatures (the coil temperature drop... | 05/27/1986 |
| 4584845 | Control system for liquid chilled by an evaporator To conserve energy in a large capacity refrigeration or air conditioning system, where liquid (usually water) is chilled by the system's evaporator and is then used to cool a building, the temperature setpoint of the chilled liquid leaving the evaporator ... | 04/29/1986 |
| 4581900 | Method and apparatus for detecting surge in centrifugal compressors driven by electric motors A surge detection apparatus for use in a refrigeration system having a centrifugal compressor driven by an electric motor includes a first pressure transducer for sensing a condenser pressure and a second pressure transducer for sensing an evaporator pres... | 04/15/1986 |
| 4573113 | Surge protection system for a d-c power supply during power-up Surge protection is provided for a d-c power supply, wherein rectified a-c line voltage is filtered in an LC filter having a shunt-connected filter capacitor, by inserting a limiting resistor in series with the filter capacitor during power-up to reduce t... | 02/25/1986 |
| 4568871 | Balancing system for limiting voltage imbalance across series-connected capacitors When a series string of similar circuit components, such as capacitors, are connected across a source of d-c voltage and those circuit components do not divide the applied voltage equally because of having different leakage resistances, and consequently d... | 02/04/1986 |
| 4565957 | Method and system for starting a motor-commutated SCR inverter Highly reliable and consistent starting is achieved by first initializing the rotor position, namely establishing the rotor in a known starting position. This is accomplished by gating on two pairs of SCRs in sequence and supplying current pulses through ... | 01/21/1986 |
| 4563877 | Control system and method for defrosting the outdoor coil of a heat pump The current outdoor ambient temperature and outdoor coil temperature in a heat pump are sensed when the heat pump's outdoor coil is clean and frost-free, and from those current temperatures the split or difference that will later exist between the tempera... | 01/14/1986 |
| 4563628 | Supervision system for monitoring the condition of a battery and a series-connected fuse The condition of a rechargeable battery, which is employed as a backup d-c power supply for a load in the event of an emergency and is normally charged by a d-c charging voltage through a series-connected protective fuse, is monitored by momentarily reduc... | 01/07/1986 |
| 4555910 | Coolant/refrigerant temperature control system A variable speed fan drive, operated in response to the sensed coolant temperature in an internal combustion engine for a vehicle, blows a controlled amount of air through the engine's radiator to maintain the coolant temperature in a desired narrow opera... | 12/03/1985 |
| 4554463 | Trigger circuit for solid state switch The power dissipated, in a trigger circuit for gating on a semiconductor switch, is minimized by employing a constant current source to provide the gate trigger current. This assures adequate triggering regardless of supply voltage variations or switch in... | 11/19/1985 |
| 4550595 | Torque measurement circuit and method An improved torque measurement circuit and method for an internal combustion engine of the four cylinder, two-cycle type includes synchronous detection circuits and circuits to account for inertia forces due to the mass of the pistons and connecting rods.... | 11/05/1985 |
| 4546742 | Temperature control system for internal combustion engine When additional heat exchangers, such as oil coolers and turbocharged air coolers, are mounted in front of or within the normal coolant heat exchanger or radiator of an internal combustion engine, a variable speed fan drive may be employed to blow air thr... | 10/15/1985 |
| 4539632 | Programmable maintenance timer system A programmable maintenance timer system suitable for use with industrial equipment such as a centrifugal water chilling system and a telemetry system including a microprocessor-based computer with a programming device for presetting selectively a maintena... | 09/03/1985 |
| 4535879 | Control system for controlling the engagement of a pressure-operated actuator A smooth, optimum engagement of a pressure-operated actuator, such as a brake or clutch, is obtained by producing a pulse width modulated signal, having a gradually changing duty cycle, which is then used to control a three-way on/off solenoid valve to wh... | 08/20/1985 |
| 4529970 | Supervision system for monitoring the integrity of a transmission line The integrity of a two-conductor transmission line, over which d-c energizing voltage is supplied to a series of shunt-connected detectors (such as fire and/or smoke detectors) and which line is terminated by an end-of-line capacitor, is monitored and rep... | 07/16/1985 |
| 4521840 | D-C Bus current monitoring system The d-c bus current, fed to an inverter through a low pass filter, having a shunt-connected capacitor, from the output of an a-c energized a-c to d-c converter (such as a phase-controlled SCR rectifier bridge), is monitored by using a-c current transforme... | 06/04/1985 |
| 4511834 | Control and stabilizing system for damperless synchronous motor Stabilized operation of a damperless synchronous motor, which is driven by a voltage source inverter energized by a d-c bus voltage, is obtained under transient conditions, such as during sudden variations of load torque, in order to maintain the torque a... | 04/16/1985 |
| 4511835 | Voltage-controlled, inverter-motor system A relatively simple inverter-motor system, comprising a minimum number of circuit components, is provided by employing a voltage-controlled thyristor inverter which in turn drives a synchronous motor having a leading power factor. With the motor current l... | 04/16/1985 |
| 4499534 | Control system for controlling an SCR network to regulate three-phase A-C power flow The power delivered from a three-phase A-C power source and through a network of SCR's (connected, for example, to form a full wave rectifier bridge or to provide an A-C switch) to a load circuit is adjusted by controlling the conduction angles of the SCR... | 02/12/1985 |
| 4489680 | Engine temperature control system The operating temperature of an internal combustion engine is maintained within desired limits by employing a single coolant temperature sensor for controlling and coordinating the operation of three different temperature control devices for the engine co... | 12/25/1984 |
| 4488101 | Starting system for chopper controlled motor-commutated thyristor inverter If the thyristor switching devices of a chopper controlled inverter are normally motor-commutated during running operation, a starting system is needed to initially rotate the motor fast enough to develop a sufficient back EMF in the motor for motor commu... | 12/11/1984 |
| 4479390 | Transducer for measuring torque and/or speed of rotating shaft A magnetic transducer fits over and encompasses a rotatable shaft and has a primary or excitation magnetic assembly having a winding arrangement that is energized to provide a-c excitation for producing an alternating magnetic flux or field, adjacent to a... | 10/30/1984 |
| 4437050 | Stabilizing circuit for controlled inverter-motor system Stabilized operation of an inverter and an a-c motor, driven by the inverter, is obtained in the presence of sudden undesired load changes by controlling the inverter so that both the amplitude and frequency of the inverter output a-c voltage will be func... | 03/13/1984 |
| 4425539 | Control system for AC induction motor A control system is disclosed for connecting the primary windings of a three-phase AC inducton motor in a delta-connection at heavy loads and for automatically reconnecting the windings in a wye-connection at light loads to effect energy savings. Power se... | 01/10/1984 |
| 4406168 | System for measuring torque and/or speed of rotating shaft A magnetic transducer fits over a rotatable shaft and has a multi-pole magnetic core, one primary winding being wound on half of the poles while a second primary winding is wound on the other half. Direct current pulses are alternately supplied to the two... | 09/27/1983 |
| 4387368 | Telemetry system for centrifugal water chilling systems A telemetry system for reporting the status of a number of physical parameters occurring during operation of industrial equipment, such as the monitoring of refrigeration/air conditioning safety controls and anticipatory refrigeration controls. Activation... | 06/07/1983 |
| 4376968 | Protection system for immunizing an inverter system against A-C line voltage disturbances When a-c power line voltage is rectified by a phase-controlled SCR rectifier bridge to develop an adjustable d-c bus voltage which is then converted by an inverter back to a-c for driving a load, such as a motor, line voltage disturbances, resulting from ... | 03/15/1983 |
| 4375612 | Controlled regenerative d-c power supply A-C energy, from an a-c power system, is converted by a phase-controlled SCR rectifier bridge, which is followed by a series-connected filter choke and a shunt-connected filter capacitor, to d-c power for delivery via a d-c bus to a load, such as an inver... | 03/01/1983 |
| 4375157 | Downhole thermoelectric refrigerator Cooling of electronic components, positioned downhole in a high temperature environment in a deep well, is achieved by a thermoelectric cooling system within a long vacuum insulated dewar flask which encompasses the electronic components and the cooling s... | 03/01/1983 |
| 4363020 | Interrogating system for remotely monitoring tire air pressure The air pressure in a tire is monitored by transmitting an electromagnetic interrogating signal (specifically a radio frequency signal) from the vehicle to a passive transponder, affixed to the wheel on which the tire is mounted, in communication with the... | 12/07/1982 |
| 4351160 | Capacity control systems for screw compressor based water chillers A control system for a rotary helical screw compressor of the variable speed type includes a variable speed motor driving the compressor for varying the compressor capacity and a slide valve member which is adjusted optimally for varying the volume of gas... | 09/28/1982 |
| 4331994 | Shootthrough fault protection system for a voltage source transistor inverter Faulted transistors in a voltage source transistor inverter are protected against shootthrough fault current, from the filter capacitor of the d-c voltage source which drives the inverter over a d-c bus, by interposing a small choke in series with the fil... | 05/25/1982 |
| 4329756 | Hot water extraction carpet and floor cleaning machine The disclosed hot water extraction cleaning machine employs a conventional canister-type wet/dry vacuum cleaner having a suction tool communicating through a wand and a suction hose to a recovery tank in the vacuum cleaner. Hot cleaning solution, held in ... | 05/18/1982 |
