Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7096796 | Brake handle with integral position sensing switch A brake handle for a train or other vehicle has a grip that may be grasped by a human operator, a shaft that is fastened to the grip, a hub that is fastened to the shaft and is rotated by the shaft, a mounting block that is supported by the hub for rotating movement... | 08/29/2006 |
| 7026897 | Multiple output magnetic sensor A door position sensing system includes a door claw having first and second magnets mounted thereon, and a Hall sensor mounted so as to sense the magnetic fields of the first and second magnets. The first magnet is mounted in a door half-latch position, and the seco... | 04/11/2006 |
| 7021821 | Differential thermal sensors A sensor includes at least two microsensor chips in a housing. The chips may be arranged as (i) an absolute thermal conductivity sensor by exposing one chip to a sample fluid and the other chip to a sealed reference fluid, (ii) a differential thermal conductivity se... | 04/04/2006 |
| 6959403 | Fault localization and health indication for a controller area network A node of a network comprises an error message detector arranged to detect error messages transmitted over the network, a counter arranged to count the error messages in order to produce an error message count, and a controller arranged to count valid messages in or... | 10/25/2005 |
| 5492445 | Hook nozzle arrangement for supporting airfoil vanes A gas turbine engine's nozzle structure includes a nozzle support ring, a plurality of shroud segments, and a plurality of airfoil vanes. The plurality of shroud segments are distributed around the nozzle support ring. Each airfoil vane is connected to a ... | 02/20/1996 |
| 5405244 | Ceramic blade attachment system A retainer ring is arranged to mount turbine blades to a turbine disk so that aerodynamic forces produced by a gas turbine engine are transferred from the turbine blades to the turbine disk to cause the turbine blades and turbine disk to rotate, but so th... | 04/11/1995 |
| 4864861 | Frame assembly and dither drive for a coriolis rate sensor An apparatus for producing signals indicative of both a Coriolis rate and an acceleration along a preferred axis while decoupling extraneous vibration and motion that would introduce errors into the signals, and a driving mechanism for vibrating the appar... | 09/12/1989 |
| 4866450 | Advanced instrument landing system A system for landing an aircraft is described, using a ground installation and an airborne installation which are synchronized together using GPS system time. Specifically, the ground installation includes a ground transmitter which radiates the sequence ... | 09/12/1989 |
| 4848156 | Frame assembly and dither drive for a coriolis rate sensor An apparatus for producing signals indicative of both a Coriolis rate and an acceleration along a preferred axis while decoupling extraneous vibration and motion that would introduce errors into the signals, and a driving mechanism for vibrating the appar... | 07/18/1989 |
| 4828382 | Passive radio altimeter A method and apparatus is disclosed for passively determining altitude above the ground of an aircraft by use of an active emitter carried on a second higher altitude aircraft. Specifically, the altitude of the aircraft is determined by measuring the time... | 05/09/1989 |
| 4811602 | Frame assembly and dither drive for a coriolis rate sensor The apparatus includes a parallelogram frame (50) including two accelerometer support surfaces (24, 26) on which are mounted two accelerometers (20 and 22) having their sensitive axes in parallel alignment. The accelerometer support surfaces are connected... | 03/14/1989 |
| 4786905 | Wind shear detector head-up display system An aircraft performance instrument which provides a first indicator which represents the line of level flight of the aircraft and a second indicator representative of the maximum permissible angle of attack of the aircraft.... | 11/22/1988 |
| 4763726 | Heat exchanger core and heat exchanger employing the same A heat exchanger core including a heat conducting tube. A plurality of spines are mounted on the tube in opposed groups and are separated by spine free areas, one of which faces the direction of air flow and the other of which faces away from the directio... | 08/16/1988 |
| 4761866 | Method of working in situ the end of a heat exchanger tube This invention is directed to a method of working the free end of heat exchanger tubes, and particularly the formation of braze cups, with the heat exchanger tubes in situ relative to the heat exchanger core with the method including the step of utilizing... | 08/09/1988 |
| 4745746 | Power control for a hydrostatic transmission The present invention is directed to a power control for an automatic transmission which consists of two valves, the first of which is a characteristic valve providing a pressure differential linearly proportional to an input speed signal provided by a pr... | 05/24/1988 |
| 4739616 | Summing pressure compensation control A displacement control for a variable displacement hydraulic motor wherein the control is a summing pressure compensator control which is responsive to the pressures of a plurality of loads so that the average, weighted average, or total pressures of the ... | 04/26/1988 |
| 4723126 | Microwave landing system for use on a back course approach The invention provides independent guidance and monitoring integrated into an MLS landing system and a scaled-down MLS take-off or missed approach guidance system useable at small airports. An added fixed beam precision guidance system is integrated into ... | 02/02/1988 |
| 4665372 | Method and circuit for producing sinusoidal waves having harmonic elimination from 2π periodical square waves A method for producing sinusoidal waves uses the steps of generating a plurality of clock signals during a 2π period, using the clock signals to control the generation of 2π periodical square wave pulses having preselected length and phase relationships... | 05/12/1987 |
| 4658282 | Semiconductor apparatus A semiconductor junction related structure to control sensitivity of signal processing systems to signals of greater versus smaller values.... | 04/14/1987 |
| 4655249 | Electromagnetic valve An electromagnetic valve uses a solenoid coil to produce a magnetic attraction of a cylindrical shell core against the action of a spring. A valve seat is constituted by a plate of a hard material arranged to cooperate with a circular ridge on an end of t... | 04/07/1987 |
| 4649359 | Explosion-proof electro-displacement converter device An explosion-proof type electro-displacement converter device comprising a cylindrical first yoke attached through a permanent magnet which is at the center of the bottom of a bowl-shaped second yoke, an exciter coil winding supported elastically by sprin... | 03/10/1987 |
| 4639658 | Float stabilized constant current source A float stabilized constant current source uses a floated cylinder with a rotational signal output generator and two torque generators for applying a linear torque and an opposing current squared torque to the floated cylinder, respectively. The current s... | 01/27/1987 |
| 4637429 | Fluid pressure regulating valve having adjustable two-stage and natural-LP gas changeover capabilities A fluid pressure regulating valve having a two-stage high and low flow rate control capability combined with a natural-LP gas control pressure changeover uses a spring biased pressure regulating diaphragm controlling a fluid through an orifice defined by ... | 01/20/1987 |
| 4634046 | Control system using combined closed loop and duty cycle control functions A control system having combined closed loop and duty cycle functions uses a differential amplifier for amplifying the difference between a setpoint or reference temperature for a system to be controlled and a detected system temperature, a thermostat hav... | 01/06/1987 |
| 4633217 | Communication apparatus A communication apparatus for receiving both power and a sensor signal over the same transmission line having a first variable impedance element and a receiving impedance element connected in series across the transmission line, a second variable impedanc... | 12/30/1986 |
| 4630165 | D.C. power control for D.C. solenoid actuators A D.C. power control for a D.C. solenoid actuator which may be used for a D.C. solenoid operated valve uses a timer circuit for switching from an initial high pull-in power after a predetermined delay to a low hold power for the valve solenoid utilizing a... | 12/16/1986 |
| 4630166 | A.C. power control for D.C. solenoid actuators An A.C. power control circuit for a D.C. solenoid actuator which may be used for a solenoid operated valve uses a triac circuit to initially apply A.C. line voltage to energize the solenoid coil of the valve to be actuated to provide valve pull-in power. ... | 12/16/1986 |
| 4628504 | Distributed bus control communication protocol In a variable time division distributed bus control system for determining the order in which a plurality of stations can communicate messages over a common communication channel, the system includes a communication channel for transmitting information be... | 12/09/1986 |
| 4624282 | Two-stage solenoid valve A two-stage solenoid valve uses a pair of stacked coaxial armatures in a cylindrical sleeve housing. A first armature is provided with a fluid sealing ring and is urged by a first spring to peripherally seal an adjacent internal fluid port in a valve base... | 11/25/1986 |
| 4623871 | Receiving apparatus A receiving apparatus for receiving an electrical signal over a 2-wire transmission line, the electrical signal having a signal component and a bias component, the bias component being used by the receiving apparatus for providing power to the receiving a... | 11/18/1986 |
| 4622539 | Alarm system with alarm message supervision An alarm message generation and broadcast system having supervision including an alarm message generation circuit for generating an alarm message, an output for receiving the alarm message so that the alarm message can be broadcast in response to an alarm... | 11/11/1986 |
| 4620668 | Adaptive control system An adaptive control system uses a controller for controlling an air temperature treatment apparatus at a reduced energy consuming level during periods of non-occupancy of a building and for energizing the air treatment apparatus before occupancy so that a... | 11/04/1986 |
| 4617952 | Switching valve and an electro-pneumatic pressure converter utilizing the same A switching valve has at least one plate-shaped piezo-electric element having a free end which is supported in a sealed chamber, at least two fluid directing nozzles arranged to be opened or closed due to the position of the free end of the piezo-electric... | 10/21/1986 |
| 4612619 | Energy management load leveling A system for leveling energy consumption of loads being controlled by a duty cycle routine, the loads having on times and off times within a predetermined period of time established by the duty cycle routine, the system having a plurality of loads, a comm... | 09/16/1986 |
| 4611619 | Air conserving restriction for use in pneumatic systems A pneumatic condition sensing system for reducing the consumption of air supplied by a pneumatic source, the system having a bleed type pneumatic device for bleeding air from a branch line to atmosphere to control the pressure within the branch line in re... | 09/16/1986 |
| 4612227 | Pressure sensor header A pressure sensor header uses a layered assembly of a first and a second metal layer with an intermediate ceramic layer having a radial surface groove providing a fluid passage between a peripheral fluid port and a hole extending through the first layer b... | 09/16/1986 |
| 4610062 | Method of making an acoustic microphone A capacitive acoustic transducer comprises a first field plate mounted to a semiconductor substrate structure, a second metal field plate having first and second oppositely and substantially exposed surfaces, and a mounting arrangement for mounting the se... | 09/09/1986 |
| 4607533 | Electromagnetic flowmeter An electromagnetic flowmeter uses a cylindrical inner tube including an electrode, an excitation coil and an inner portion of an electrical connector with the inner portion being located on an outer circumferential surface of the tube and electrically con... | 08/26/1986 |
| 4599095 | Thin bed sorption/desorption apparatus and method for making the same A thin bed sorption/desorption apparatus includes a heater element laminated within a high temperature chemically inert polymer with an adhesive on the outside of the laminate being used to attach a thin film of small particle size sorptive material. Vari... | 07/08/1986 |
| 4597778 | Quasi-continuous sorption/desorption analysis method and an apparatus utilizing the same A quasi-continuous sorption/desorption analysis method includes the steps of admitting a sample to be analyzed to a stationary sorption/desorption bed for adsorption therein. The flow rate of the sample across the bed is maintained at a high rate for an e... | 07/01/1986 |
