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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 4852026 | Method and apparatus for the evaluation of an angle over an extended range A method and device for evaluating an angle A known by at least two trigonometric functions and capable of varying over a range greater than 360°. Two counter integers N0, N1 are stored and up-dated, each with respect to the other, ... | 07/25/1989 |
| 4833414 | Method and apparatus for the identification of a faulty conductor in a multiple supply line A method of and apparatus for determining which if any phase of duplex supply lines wherein each phase w is assigned two conductors w1 and w2. The method and apparatus use an asymmetry value, for example a function of the relationship (output of 9) of the... | 05/23/1989 |
| 4797846 | Digital resonant filter A band pass digital filter which may be straightforwardly implemented. Considering successive samples I the last of which is N and input samples XI and output samples YI, the filter, in one embodiment, conforms to the expression: where J and F are integer... | 01/10/1989 |
| 4796225 | Programmable dynamic shift register with variable shift control The invention relates to a shift register structure and its control. The positioning and/or synchronization of data contained in this register for the purpose of serial operation are essentially obtained by acquisition of data on at least one auxiliary ou... | 01/03/1989 |
| 4785168 | Device for detecting and localizing neutral particles, and application thereof A device for detecting and localizing neutral particles such as X photons, gamma photons or neutrons is essentially constituted by a solid converter (2) disposed at a glancing incidence relative to the radication to be detected, together with networks of ... | 11/15/1988 |
| 4780908 | Method and apparatus for signal transmission regulation in differential protection Method and apparatus for the regulation of a modulated signal transmitted from a transmitter (E) to a receiver (R) in a differential protection system for an electrical installation. The invention lies in the regulation of the frequency spectrum of the mo... | 10/25/1988 |
| 4763103 | Process and method for wide band transmission, particularly for data transmission over an electricity distribution network At transmission (10) each bit for transmission is coded as a function of its state by producing (12) a particular coding frequency combination, these being divided into two distinct bands spaced one from another and the coding combinations being chosen su... | 08/09/1988 |
| 4739279 | Method and a device for rapid adjustment of the phase of a clock signal in rapid phase A method and device for supplying a sinusoidal output signal of controlled phase. First and second input signals, of different phase but derived from a common sinusoidal source, are multiplied by second and first sinusoidal reference signals, respectively... | 04/19/1988 |
| 4737872 | High density electrical connector for use with rotating head magnetic recording apparatus The connector comprises: a central shaft (7) at the periphery of which linear conductor elements are longitudinally disposed, at least in a zone of contact provided on the shaft; a group (22) of radially disposed resilient conductors having conductive end... | 04/12/1988 |
| 4737800 | Electrical supply for a thermal printing head Method and device to supply, from a source of alternating voltage (5a or 5b), a thermal printing head (3) comprising a number of heater units (3a, 3b). The device comprises a means (6a to 6d) of obtaining a rectified voltage, a means (8) of detecting the ... | 04/12/1988 |
| 4723113 | Very high frequency harmonic generator A very high frequency harmonic generator utilizes a type III-V (e.g. GaAs) FET. An input signal is applied to the gate of the FET at a sufficient level to induce non-linear functioning of the FET. This causes an output signal to appear between the source ... | 02/02/1988 |
| 4709280 | Apparatus for varying the path of magnetic tape passing over a rotary tape head Apparatus for recording and reading information on a magnetic tape, comprising heads rotating in the median plane of a drum (38) against which the tape can pass over a helical path (11). Means are provided for modifying the pitch of the helical path (11) ... | 11/24/1987 |
| 4626772 | Process and device for determining a parameter associated with a faulty electric conductor, using a composite monitoring signal Method and apparatus for determining, at a measurement point in a faulty conductor of electrical energy, a fault parameter such as the distance between the point of measurement and such fault or the direction of such fault. As a signal of a fault current,... | 12/02/1986 |
| 4624399 | Gripping drive for magnetic tape Tape drive apparatus having a drive roller 1 and pinch roller 2 including a idler roller 3 around which tape 4 passes. The pinch roller 2 which is rotatable about two normal axes (A2 and A4), is resiliently urged against the drive roller 1 and the idler r... | 11/25/1986 |
| 4595988 | Electronic meter for measuring active and reactive energies in a three-phase network A plurality of single-phase energy sensors each having a first input connected to a current converter and a second input connected to voltage converter supply pulses to a calculating device. The number of pulses over time represents the energy detected by... | 06/17/1986 |
| 4568872 | Method of measuring the distance of a fault on a line taking account of distributed capacitances The invention concerns a method of direct measurement of a parameter characterizing a fault on an electricity line 1, such as the distance x or the resistance Rd of the fault, the method being based on Ohm's Law including the line inductance L ... | 02/04/1986 |
| 4560922 | Method for determining the direction of the origin of a disturbance affecting an element of an electrical energy transfer network A directional relay for providing indication of the direction of a fault on an electric power transfer network has an adder (9), a subtractor (10) and filters (11) which receive signals from voltage and current transformers (6,7) and derive signals relate... | 12/24/1985 |
| 4507624 | Voltage-to-frequency converters A monostable circuit of a voltage-to-frequency converter supplies feedback pulses to balance the input signal to a first integrator. These same pulses are supplied to a second integrator where they are compared with reference pulses from a crystal-control... | 03/26/1985 |
| 4500973 | Electronic devices An electronic watthour meter for connection in a two-wire power distribution circuit comprises a shunt connected in one of the wires and an electronic circuit comprising a transconductance multiplier, a V to F converter and a reversible counter. The DC po... | 02/19/1985 |
| 4494068 | Measurement shunt with compensation for induced error voltages A measurement shunt comprises a resistance provided with first and second voltage terminals and intended to provide a voltage representative of an electric current passing through it, and an inductance connected to at least the first of said voltage termi... | 01/15/1985 |
| 4488690 | Cassette with controlled-speed elastic belt In a tape transport apparatus comprising notably a floating roller (12) tangent to reels (5, 6), and an elastic endless belt (11) extending between the floating roller (12) and the reels (5, 6) to form a first loop (11a) surrounding the floating roller (1... | 12/18/1984 |
| 4431146 | Tape entrainment device with a movable entrainment roller A tape entrainment device especially for a magnetic recorder, comprising a roller (11) tangential to the periphery of each of the reels (9 and 10) and an endless belt (12) which passes between the roller and the reels and engages an arc of the periphery o... | 02/14/1984 |
| 4409545 | Electronic measuring device for a polyphase network, in particular for the measurement of power A device for measuring a quantity such as the electric power in a polyphase alternating current network including at least two phase conductors and a reference conductor, of the type comprising two measuring devices which are associated respectively with ... | 10/11/1983 |
| 4389683 | Switch-tuned filters A switch-tuned filter comprises a capacitive filter and a resonant filter both receiving an input signal to be filtered. The resonant filter comprises a gyrator the frequency response of which depends on circuit parameters in two circuit paths therein. A ... | 06/21/1983 |
| 4378533 | Modulator for injecting signals into a polyphase power transmission system A modulator for injecting signals into a polyphase power transmission system includes a bridge of four thyristors for each phase. The thyristors of each bridge are connected so that when the thyristors of two opposite arms are ignited simultaneously they ... | 03/29/1983 |
| 4366474 | Identification of electric power network phases experiencing disturbances A system for identifying which of the phases of an N-phase electric-power transmission network has experienced an electrical disturbance. For each phase there is produced a first signal representative of the transient variations of an electrical parameter... | 12/28/1982 |
| 4363041 | Dual capstan tape transport having controlled tape tension This invention relates to a tape transport for use with a transducer to transport tape along a predetermined path extending past the transducer, comprising two capstans, each disposed at a respective end of the predetermined path; two rollers, each dispos... | 12/07/1982 |
| 4361766 | Remotely-controllable relays A ripple control relay is arranged (i) to delay implementation of a received command until the end of a predetermined time interval following reception of the command; (ii) to delay implementation as in (i), and to implement the complementary command auto... | 11/30/1982 |
| 4359684 | Electronic watt-hour meter An electronic watthour meter for connection in a two-wire power distribution circuit comprises a shunt connected in one of the wires and an electronic circuit comprising a transconductance multiplier, a V to F converter and a reversible counter. The DC po... | 11/16/1982 |
| 4335336 | Device for controlling speed A function generator (25) receives the signal (svm) representing the speed of rotation of a motor (13) and works out EN=CN+f (vm), f (vm) being a single-valued and monotonic function of the real speed vm of the motor and CN being worked out by computer me... | 06/15/1982 |
| 4329638 | Capacitive voltage transformers The present invention refers to capacitive voltage transformers. In accordance with one embodiment a capacitive voltage transformer has two capacitors connected in series between a point on a high voltage line and a reference point such as earth and two impeda... | 05/11/1982 |
| 4327392 | Protective apparatus for use with power lines The invention relates to protective apparatus used on AC power lines. An embodiment of an apparatus for putting the invention into practice comprises impedance sensing means having an impedance characteristic defining at least three distinguishable zones ... | 04/27/1982 |
| 4327390 | Capacitive voltage transformers with electronic output A capacitive voltage transformer of the type having voltage divider capacitors and an electronic amplifier connected to one of the divider capacitors includes circuitry for isolating the voltage divider capacitors in the event that primary power to the vo... | 04/27/1982 |
| 4325098 | Detection of the position of a fault on an electric link A method for the directional detection of faults on power transmission lines is described. According to one embodiment applied to a link comprising several lines in parallel each provided, towards each of their respective ends, with a directional relay, t... | 04/13/1982 |
| 4310863 | Magnetic tape recorders In a magnetic-tape recorder, tension rollers positioned before and after the tape heads in the tape path have an outer layer of a polyurethane elastomer to absorb vibration of the tape and reduce flutter. Grooves in the elastomer layer enable the effectiv... | 01/12/1982 |
| 4251766 | Method and apparatus for determining the direction of a fault on a power transmission line Directional relay and method for monitoring at least one A.C. power transmission line to determine the position of a fault on the line with respect to a measurement location thereon. According to a representative embodiment characteristic parameters, typi... | 02/17/1981 |
| 4242634 | Electronic multiplying circuits An electronic multiplying circuit, primarily intended for use in an electronic watthour meter, comprises a variable-transconductance multiplier of the type comprising two emitter-coupled pairs of transistors, the collectors of one pair being cross-coupled... | 12/30/1980 |
| 4224869 | Parallel line printer According to a representative embodiment of the invention, a parallel line printer such as a thermal printer is provided having a parallel printing head with a plurality of printing elements arranged to extend across the width of a paper strip. Electrical... | 09/30/1980 |
