Bizarre Patents
Mountable Printable Placard With Headband
A resilient headband in a shape for being mounted on the head of the user. The headband is equipped with a longitudinal slotted member for holding a placard.
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| Number | Title | Issue Date |
| 4628397 | Protected input/output circuitry for a programmable controller Input/output circuitry is disclosed for use in an I/O system of a programmable controller. The circuitry is protected against overcurrents without the use of fuses or circuit breakers, and is automatically restored to normal operation following correction... | 12/09/1986 |
| 4618906 | Hybrid solid state/mechanical switch with failure protection A hybrid solid state/mechanical switch is provided with a pair of mechanical contacts connected in parallel with a solid state switching device. These components are operated by a control circuit to achieve arcless current interruption under normal condit... | 10/21/1986 |
| 4594633 | Integrated circuit protection circuit An integrated circuit protection device for use with a voltage regulator used to drive an integrated circuit to prevent damage to the integrated circuit which goes into a "latch up" condition. The integrated circuit protection device comprises a first swi... | 06/10/1986 |
| 4571487 | Methods and apparatus for supplying electrical power for proximity effect heat-tracing A proximity effect heat-tracing system in which proximity effect heat-tracing circuits are fed in either direction from a plurality of feed points connected to a single main transformer to increase the length of pipeline supplied by a single main transfor... | 02/18/1986 |
| 4564747 | Methods and apparatus for detecting abnormalities in proximity effect heat-tracing circuits Methods and apparatus for detecting abnormalities in proximity effect pipeline tracing circuits by coupling conductive elements carrying proximity effect circuit currents and having opposite polarities. These conductive elements are coupled to an addition... | 01/14/1986 |
| 4562454 | Electronic fuse for semiconductor devices A semiconductor fuse is disclosed that provides protection against both overcurrent and the abrupt application of a voltage to semiconductor devices. A first means is coupled to an input terminal for providing a signal when a current is applied to the inp... | 12/31/1985 |
| 4507767 | Control circuit for controlling light source in optical disc device An optical disc device including a semiconductor laser as a light source and making the light output of the semiconductor laser different between an information recording operation and an information reproducing operation is disclosed in which the semicon... | 03/26/1985 |
| 4432029 | Protective means for series capacitors A protective means for a series capacitor in a high-voltage network comprises a voltage-dependent resistor (varistor) arranged in parallel with the series capacitor, a spark gap arranged in parallel with the varistor for shunting the latter when it become... | 02/14/1984 |
| 4428023 | Electronic protective circuit The rectifiers for generating direct-currents or hybrid or complex currents for inductive loads must be protected against fault currents which can arise due to faulty operating conditions in the load inductance, by providing for a rapid current cutoff. Th... | 01/24/1984 |
| 4408248 | Protection circuit A protection circuit for communication equipment connected to a two conductor communication line includes a bridge rectifier having alternating current terminals connected to the conductors and to ground. The direct current terminals of the rectifier are ... | 10/04/1983 |
| 4371910 | Safety device for electric consumers in motor vehicles Safety apparatus for a motor vehicle electric consumer having a temperature-dependent internal resistance, which includes a temperature indicating circuit for providing a signal which accurately indicates the consumer temperature to a threshold switch whi... | 02/01/1983 |
| 4369353 | Apparatus and method of drying a transformer An apparatus and method of drying a transformer by applying current to a winding thereof in a controlled fashion. Alternating with periods of applying the current to the winding, the electrical resistance of the winding is periodically measured using a br... | 01/18/1983 |
| 4363064 | Overcurrent protection system An overcurrent protection system adaptable for use with power controllers the single or multi-phase ac, or dc types includes a load current sensing element in combination with an overcurrent sensing/inverse time delay circuit, a power switch and a crowba... | 12/07/1982 |
| 4346421 | Fault detector A fault detector for detecting shoot-through conditions in series connected solid state rectifiers (326, 329) of a power inverter (314) is disclosed. A capacitor (311) discharges when a shoot-through occurs and the discharge current is detected by a curre... | 08/24/1982 |
| 4309735 | Protective circuits for converter-supplied D.C. motor A d.c. motor whose armature is supplied from an a.c. power source through an a.c./d.c. thyristor converter and is subject to damaging commutator flash-over, as from loss of a.c. voltage during regeneration is provided with a protective circuit which inclu... | 01/05/1982 |
| 4259704 | Protective circuit for zinc oxide varistors The invention provides an improved circuit for determining rates of rise of energy in metal oxide varistor devices. A high voltage transformer is employed to trigger a protective air gap for bypassing the metal oxide varistor device. One application for t... | 03/31/1981 |
| 4249224 | Surge voltage arrester with fail-safe feature A surge voltage arrester utilizes for surge protection a varistor of the zinc oxide type between a line terminal and a ground terminal. The varistor is of a type that has a resistance which decreases as increasing voltage is applied thereacross. With incr... | 02/03/1981 |
| 4184186 | Current limiting device for an electric power system This current limiting device comprises a normally-closed source-side circuit interrupter, a normally-closed load-side circuit interrupter, an electrical conductor connected between the interrupters for connecting the interrupters in series, and a normally... | 01/15/1980 |
| 4174529 | Protective circuit for zinc oxide varistors The invention provides a circuit for determining excessive energy magnitudes or rates of rise of energy in metal oxide varistor devices. The circuit further provides a series of low voltage control pulses for energizing a high voltage pulse generator. The... | 11/13/1979 |
| 4163271 | Electronic switching apparatus An electronic switching apparatus comprising an elongate device having an opening in one end thereof for receipt of an electric conductor therethrough, a transformer winding surrounding the opening within the device such that a voltage will be induced in ... | 07/31/1979 |
| 4131908 | Semiconductor protection device having a bipolar lateral transistor A safeguarded integrated circuit includes two supply electrodes, an output electrode and an input electrode. Between two of the electrodes there is provided a protection circuit having a lateral bipolar transistor, the emitter and collector zones of which... | 12/26/1978 |
| 4130850 | High speed fault diverter switch for gas-insulated systems A high speed fault diverter switch is connected near the input side of a gas-insulated substation. The switch is normally open and is used in response to arcing anywhere within the substation to connect the gas-insulated high-voltage conductor to ground f... | 12/19/1978 |
| 4090227 | Transient-protected signal distribution circuit A signal distribution circuit subject to high-level reverse-current transients is protected by the combination of a reverse-current sensor and a controlled current shunt. The sensor detects a potentially damaging reverse-current current surge and sends a ... | 05/16/1978 |
| 4075677 | Electrostatic coating system A system for electrostatic deposition of a coating on an article from a charging device includes a direct current high voltage supply having first and second terminals across which the high voltage is impressed. The article to be coated is held at a poten... | 02/21/1978 |
| 4071874 | Hammer protection circuit A hammer protection circuit automatically disconnects a power supply from a hammer actuating coil in order to inhibit current flow through the coil when such current flow is either greater than a predetermined level or present for greater than a predeterm... | 01/31/1978 |
| 4054933 | Saturating time-delay transformer for overcurrent protection Electrical loads connected to d-c supplies are protected from damage by overcurrent in the case of a load fault by connecting in series with the load a saturating transformer that detects a load fault and limits the fault current to a safe level for a per... | 10/18/1977 |
| 3980929 | Corona current interrupter In an electrostatographic copier in which an imaging surface is corona charged by high voltage biased electrodes, particularly those in which corona wires overly a reusable photoreceptor, protection of the imaging surface from arcing from the corona elect... | 09/14/1976 |
| 3979643 | Logic driver circuit with output protection A resistor senses low-level drive current is a logic circuit. When the output is shorted, excessive drive current turns on a sensor transistor, which causes drive voltage to the output stage to be clamped to ground, and to remain clamped until the fault i... | 09/07/1976 |
| 3978389 | Series-connected static convertors with re-starting regulator after fault A static convertor arrangement includes at least two static convertors, the direct current sides of which are series connected and connected to a direct current line, while the alternating current sides are connected to an alternating current network. Eac... | 08/31/1976 |
