Class 340/870.42 - With feedback (e.g., reflex along line)

Subclass of Class 340 - Communications: electrical
Definition: Subject matter having means to feedback a signal from the
No. of patents: 31
Last issue date: 09/01/1998

Browse patents
Browse applications

Number	Title	Issue Date
5801644	Apparatus for measurement of torque on a rotating shaft Apparatus for measuring the horsepower transmitted by the drive shaft of an automotive vehicle, by determining the torque on the shaft through the measurement of the resistance of an included strain gauge, yet without the need for a power supply, such as ...	09/01/1998
5764161	Sensing apparatus using frequency changes An apparatus and method for determining various physical quantities such as temperature, pressure, stress, strain, distance and the like in a manner such that a change in the physical quantity of interest results in a measurable change in the frequency of...	06/09/1998
5635919	Sensing apparatus An apparatus for determining various physical quantities such as temperature, pressure, stress, strain, distance and the like in a manner such that a change in the physical quantity of interest results in a measurable change in the frequency of oscillatio...	06/03/1997
5546079	Output circuit arrangement integrated in an integrated electric circuit for supplying an output signal determined by user selectable parameters An output circuit in which both the signal type (i.e., current or voltage) as well as the signal level range (for example, 0 to 10 V, -10 V to +10 V) are based on user input parameters. The circuit is integrated in an application-specific integrated circu...	08/13/1996
5264843	High speed reflected impedance telemetry system for implantable medical device A telemetry system which will transmit data at a relatively high rate while retaining a high degree of accuracy is disclosed which utilizes a servo feedback loop in conjunction with a conventional reflected impedance receiving front end parallel LC circui...	11/23/1993
4959649	Current holding circuit of two-wire instrument A current holding circuit of a two-wire instrument which includes a transmitter and a receiving resistor, remotely located from the transmitter, for detecting a signal from the transmitter as a change in loop current, and to which a commuication device is...	09/25/1990
4897647	Method for absolute position detection and an apparatus therefore There are provided a method and an apparatus for absolute position detection, in which position detection is performed with high accuracy by interpolation between feedback pulses generated as an object of position detection moves, and the power-on command...	01/30/1990
4804958	Two-wire transmitter with threshold detection circuit A threshold detection circuit for improving the output of a two-wire transmitter is disclosed. The transmitter comprises a sensing means which has a sensor responsive to a parameter to be sensed by the transmitter and an excitation means which provides an...	02/14/1989
4604566	Voltage pulse to current regulating convertor A current regulating convertor includes a pulse generator which generates a voltage pulse train having a variable duty cycle. A low pass filter is connected to receive the pulse train and has a cutoff frequency which is well below the frequency of the pul...	08/05/1986
4560983	Dynamically interactive responsive control device and system A general device for the input of information in a binary format through rotational motion is disclosed, having independent means for the simultaneous output of information in a form perceivable to the human tactile sense. In particular, a knob is coupled...	12/24/1985
4558319	Automated system monitoring using frequency and amplitude modulation In automatic assembly or processing operations employing multiple machines or robots, a signal preprocessor employing frequency and amplitude modulation techniques translates a plurality of monitored condition signals associated with each machine or robot...	12/10/1985
4532510	Measuring apparatus having a sensor located remotely from its electricity power supply The measuring apparatus comprises a sensor (11) having a first electrical characteristic (balance of inductance) which is directly modifiable by the magnitude of a quantity or characteristic to be measured (e.g. pressure). A remote electrical power supply...	07/30/1985
4511896	Remote sensor system with bi-directional monitoring and control of operation An improved electronics system for transmission of low level analog signals rom a remote sensor to a control terminal utilizing a single pair of unshielded wires. A bi-directional exchange occurs between the sensor and control terminal which results in pow...	04/16/1985
4420753	Circuit arrangement for the transmission of measurement value signals A circuit arrangement for transmitting signals from a measuring transducer via a two-wire circuit to a receiver which, in turn, via the same two-wire circuit supplies power for operating the transducer. The circuit arrangement comprises a voltage controll...	12/13/1983
4414853	Pressure transmitter employing non-linear temperature compensation A pressure transmitter is provided for producing a voltage signal representative of the magnitude of pressure being applied to a diaphragm of the transmitter, wherein a network including strain-sensitive resistors that are formed in the diaphragm is coupl...	11/15/1983
4354190	Rotor measurement system using reflected load transmission An apparatus is provided for obtaining data from sensor measurements made on a body moving rotationally with respect to a stationary observer. Radio frequency energy is reactively coupled between an energy source fixed with respect to the observer and loa...	10/12/1982
4349822	Inductive potentiometer An inductive potentiometer for supplying a d.c. output voltage, which is linearly variable as a function of the rotation angle of a spindle. The potentiometer is constituted by a synchro-resolver and two associated circuits, an a.c. voltage supply circuit...	09/14/1982
4348673	Instrumentation system with electric signal transmitter Instrument system including an electronic transmitter for a vibrating-wire differential-pressure sensor at a field location and connected by a two-wire line to a control room. The transmitter includes an oscillator to produce vibrations of the wire at its...	09/07/1982
4317116	Arrangement for the generation of a signal in proportion to a capacity An active measuring converter for connection between a two-wire line and an impedance to be measured, wherein an oscillator supplies alternating voltage to the impedance, and the variation in current drawn by the oscillator is in accordance with the value...	02/23/1982
4313114	Liquid level recorder apparatus and method for storing level differences in memory A shaft position recorder apparatus and method are described which can be used for recording changes in liquid levels. The recorder employs an electronic memory for storing the changes in liquid levels which are entered into the memory at predetermined ti...	01/26/1982
4296413	Resistance-bridge to frequency converter with automatic offset correction A circuit for converting changes in a sensed physical parameter, such as resistance and resistance change as a function of pressure, temperature and the like, into a digital signal of proportional frequency. A sensor bridge, monitoring the parameter to be...	10/20/1981
4292633	Two-wire isolated signal transmitter A two-wire signal transmitter which isolates for direct current voltages the transducer input circuitry from the transmitter output circuitry. The transmitter superimposes a controlled current signal on the two-wire transmission line which also conducts a...	09/29/1981
4281325	Positive feedback meter pulse initiator A meter pulse initiator is employed to generate signals corresponding to the rotation of the rotor of a watthour meter. Infrared light emitting diodes (IREDs) receive a small steady state driving current and radiate two low intensity beams of radiation th...	07/28/1981
4205327	Two wire current transmitter with adjustable current control linearization A two wire current transmitter for controlling the total current in the two wires in accordance with a value of a parameter to be sensed, which provides for substantial linearization of the electrical characteristic representative of the value of the para...	05/27/1980
4157536	Synchronous transmission device of the vernier resolver type incorporating compensation of parasitic coupling A synchronous transmission device of the vernier resolver type, in which a variable reluctance is produced by the rotation of an unwound magnetic rotor, wherein unwanted inductive and capacitive coupling effects between windings, resulting in parasitic si...	06/05/1979
4123696	Signal handling apparatus Signal-processing apparatus for use with industrial instrumentation systems and the like, and comprising memory means to maintain a signal level for long time periods without drift. An input signal level is translated into the positioning of a movable mem...	10/31/1978
4083237	Differential reluctance motion detector A displacement detector yielding an electrical output signal that is linearly proportional to the extent of input motion. The input motion to be monitored is applied to the shiftable armature of a differential reluctance transducer constituted by a pair o...	04/11/1978
4011510	Signal-responsive apparatus having magnetic-particle-friction memory Signal-processing apparatus for use with industrial instrumentation systems and the like, and comprising memory means to maintain a signal level for long time periods without drift. An input signal level is translated into the positioning of a movable mem...	03/08/1977
3975719	Transducer for converting a varying reactance signal to a DC current signal A two wire current transmitter providing a current signal representing a parameter measured by a variable reactance transducer along the same two wires that are used to carry excitation power to the circuit. The reactance is measured by a circuit providin...	08/17/1976
3959786	Isolated two-wire transmitter An isolated two-wire transmitter includes a regulated d.c. power supply having an astable multivibrator which generates isolated power supplies and input terminals which are connected to a first operational amplifier to thereby control a transistor in ord...	05/25/1976
3948098	Vortex flow meter transmitter including piezo-electric sensor Flow-metering apparatus of the vortex-shedding type wherein an obstruction in a flowing fluid develops a series of vortices which are sensed by a pressure-responsive piezo-electric element to produce an alternating voltage having a frequency corresponding...	04/06/1976

PatentStorm

Bizarre Patents

PatentStorm News

Class 340/870.42 - With feedback (e.g., reflex along line)