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| Number | Title | Issue Date |
| 4065716 | Apparatus for displaying a band representation of a signal Apparatus for displaying a band representation, e.g. a bar graph or column graph, of a signal comprises a series connected array of light-emission devices such as LED.s and a preferably constant current source connected to one end of the series. Transisto... | 12/27/1977 |
| 4054834 | Device for measuring AC in a high tension line Shunt means supply a diode bridge with an alternating current proportional to the AC to be measured. The bridge has at least two electroluminescent diodes which emit two alternating streams of half-wave light pulses which are supplied to two fibre optic s... | 10/18/1977 |
| 4039956 | Electronic indicator An electronic frequency indicator for an AM/FM receiver utilizing a plurality of light-emitting diodes. The intensity of the diodes is varied to achieve greater resolution for the number of diodes in the indicator.... | 08/02/1977 |
| 4037153 | Digital meters A meter for presenting a digital display representative of an analogue input signal is disclosed in which series connected control circuits are arranged to draw current from a first constant current source, a second constant current source is connected to... | 07/19/1977 |
| 4032843 | Compensated signal isolator A device for coupling a signal value out of a circuit which itself is floating at some relatively high voltage (termed common-mode voltage). A sensor for converting the parameter to be measured to a signal voltage, together with an amplifier and light-emi... | 06/28/1977 |
| 4025845 | System with photocouplers for automatic checking of operating thyristors Device for the automatic checking of operating thyristors making it possible to check clearly the good condition of thyristors. It comprises photocouplers connected with resistors, arranged in parallel with a group of thyristors. The outputs of the photoc... | 05/24/1977 |
| 4017796 | Electrical circuit means for use in analogue display and/or control systems Analogue display apparatus comprising a chain of light emitting diodes (LED's) connected in series with a constant current source, there being respective transistor switches connected between one side of each LED and a reference voltage source unique to t... | 04/12/1977 |
| 4015201 | Electrical continuity and voltage testing device A circuit testing device includes a casing, two probes one of which projects from the casing, a voltage level testing circuit operatively connected with one probe and incorporating simple and advantageous circuitry including transistor amplifier means and... | 03/29/1977 |
| 4006412 | Digital display system circuit A digital display system is provided for visually indicating the amplitude of a received signal. A plurality of reference signals incrementally graduated from a low amplitude to a high amplitude is applied as first inputs to a polarity of comparators and ... | 02/01/1977 |
| 4006414 | Indicating device An indicating device in the form of a thin metallic foil such as manganin on which a temperature indicating material such as Tempilaq is sprayed the foil being tapered to provide a temperature gradient whereby the passage of current through the tapered we... | 02/01/1977 |
| 4004220 | Electronic voltmeter This electronic voltmeter is particularly suited to develop volume unit output readings for appliance type electronic equipment. Seven operational amplifiers are used to selectively and separately energize seven light emitting diodes. Each of the operatio... | 01/18/1977 |
| 4002975 | Electro-optic measurement of voltage on high-voltage power lines Crystals which vary the polarization of a beam of light according to the intensity of the electrical or magnetic field in the crystal are placed in the vicinity of a high-voltage power line. A laser beam is directed from an elctrically isolated position t... | 01/11/1977 |
| 3991367 | Detection of potential on high-voltage transmission lines A suspension insulator used on the tower of a high-voltage transmission line has a capacitive voltage dividing pickup plate placed thereon to capacitively pick up a low-power indication of the potential carried by the line. In order to detect the potentia... | 11/09/1976 |
| 3987392 | Luminescent voltage indicator circuit A plurality of luminescent elements, such as light-emitting diodes, incandescent lamps or the like, are located adjacent each other, each connected to the output of a difference amplifier. The respective inputs of the difference amplifier are connected, o... | 10/19/1976 |
| 3980949 | Magneto-optical measuring transducer for very high currents/voltages A magneto-optical measuring transducer for use as a Faraday rotator in a device to measure high currents/voltages in response to a magnetic field created by the current to be measured by rotating the direction of polarization of a beam of polarized light ... | 09/14/1976 |
| 3979667 | Electrical indicators A domestic soil-moisture indicator of the kind including a probe comprising a pair of electrodes with spaced ends for insertion in the soil whereby the resistance of the conductive path established between them by the soil to be tested varies in resistanc... | 09/07/1976 |
| 3979743 | Displays A liquid crystal analogue display device has a pair of electrodes between which a nematic liquid crystal material is disposed, so that the liquid crystal is switched from a homogeneous to a homeotropic state when the voltage between the electrodes exceeds... | 09/07/1976 |
| 3974441 | Battery checker Disclosed is a device for checking the energy level of a battery, or battery pack, of the type used in the powering of transmitters, receivers and servos used in powered model airplanes, boats, cars, etc. The circuit connects a silicon controlled rectifie... | 08/10/1976 |
| 3969670 | Electron beam testing of integrated circuits Disclosed is a technique for testing functional circuit units of an integrated circuit. For each separate functional circuit unit desired to be tested, a capacitor is connected to each input while a diode is connected to each output. An electron beam then... | 07/13/1976 |
| 3963931 | X-ray tube current monitor X-Ray tube monitoring apparatus comprising a shockproof housing having insulatingly disposed therein for electrical connection between the anode of an X-ray tube and a high voltage source a current sensing means which is operatively connected to opto-elec... | 06/15/1976 |
| 3964020 | High voltage system with self-test circuitry A high voltage system with self-test circuitry which senses the amount of current in a high voltage line and communicates this information by means of fiber optics to control electronics which in turn communicate said information to actuator means which c... | 06/15/1976 |
| 3961256 | Light-emitting semiconductor display apparatus for displaying a band representation of a voltage analog of a measured parameter Display apparatus receives from a transducer a voltage analogue signal representing the parameter to be measured and uses the signal to produce an illuminated band-representation of the parameter by a series of semiconductor light emission devices. A zero... | 06/01/1976 |
| 3952247 | Level indicating apparatus for P.C.M. transmitting system Level indicating apparatus includes a plurality of light emitting indicators each indicating a different level of analog signal encoded in pulse form, and two indicators responsive to the most significant bit of the pusle signal to indicate polarity and f... | 04/20/1976 |
| 3943367 | High frequency optically coupled differential voltage probe with logarithmic response A voltage probe is provided for measuring high frequency transients during lectromagnetic pulse simulator testing of electronic devices. A probe tip module including input terminals for receiving transient voltages, a differential amplifier producing a rep... | 03/09/1976 |
| 3939412 | Voltage measuring device for an encapsulated high-voltage switching installation A voltage measuring device for use with an encapsulated, high-voltage switching installation including an inner conductor within a grounded metallic outer tube. The measuring device includes means for widening the outer tube, thereby providing a space for... | 02/17/1976 |
| 3938039 | Voltage measuring device for encapsulated high-voltage installations A voltage measuring device is described which is suitable for application to encapsulated, high-voltage switching installations which include an inner conductor surrounded by a grounded metallic outer tube. The device utilizes the fact that an electric fi... | 02/10/1976 |
| 3936742 | Apparatus for measuring electrical quantities at high-voltage potential A device for measuring an electrical quantity at high-voltage potential includes a light-wave conductor for conducting light to a measuring sensor on the high-voltage side. A reflecting surface is arranged at the end of the measuring sensor that faces awa... | 02/03/1976 |
| 3934199 | Method of testing an electrical circuit A non-destructive method of testing an electrical circuit includes observing birefringent changes in a layer of liquid crystals during the operation of the circuit. The method comprises applying the layer of liquid crystals over the circuit with the liqui... | 01/20/1976 |
| 3932809 | Deflector galvanometer A galvanometer structure is disclosed for high speed deflection of a light beam, such as that from a laser source. A flexible member is secured at one end in a mount of electrically insulating and magnetically inert material, for example, a plastic block.... | 01/13/1976 |
