Bizarre Patents
Mouthguard made at least partially from an edible candy
A mouthguard includes a U-shaped upper bite plate which removably fits over upper teeth of a person, with the entire upper bite plate being made from a soft, deformable and edible gummi candy.
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| Number | Title | Issue Date |
| 7916508 | Systems and methods involving thyristors An exemplary embodiment includes a system for measuring and controlling a thyristor comprising a thyristor, a Rogowski coil in operable communication therewith the thyristor, and a processor operative to receive signals from the Rogowski coil, determine a direct cur... | 03/29/2011 |
| 7394675 | Power supplying apparatus and power supplying method A power supply operable from a plurality of alternating current inputs had having protection from abnormal operation. The power supply includes a switchable rectifier and a voltage to voltage converter. Protection circuits switch off at least one of the rectifier an... | 07/01/2008 |
| 7368891 | Charge control method of capacitor in thyristor converter Charging time of a capacitor is shortened while avoiding erroneous firing due to distortion of a power supply voltage and sustaining an inrush current at a constant level. In the charge control method of a capacitor in a thyristor converter comprising a thyristor fo... | 05/06/2008 |
| 7281151 | Method of stopping data communication of a communication apparatus based on a detection of a power supply voltage drop In data communication apparatus for communicating with another data communication apparatus via cables, when a power supply voltage applied to the data communication apparatus drops and the application of the power supply voltage is stopped, a power-supply-voltage-d... | 10/09/2007 |
| 7269039 | Method and device for producing rectifier gating signals using feed forward control A device includes an active rectifier (14) having control gates controllable to produce an output voltage on a DC bus (20), a gate control circuit (16) for producing gate control signals for controlling the active rectifier control gates, a firs... | 09/11/2007 |
| 7187569 | Signal generation apparatus and method for seafloor electromagnetic exploration An apparatus for generating electronic signals for application in subsea electromagnetic exploration. A surface generated high-voltage low-current source signal stabilized at a first frequency is supplied to a deep-tow vehicle (18) via an umbilical cable (... | 03/06/2007 |
| 7050313 | Aircraft AC-DC converter An AC-DC converter includes a DC reference voltage generation unit that creates a DC reference voltage waveform based in part on a feedback signal. The AC-DC converter also includes an SCR firing unit that receives a variable frequency power output from the generato... | 05/23/2006 |
| 6377482 | Device and method for line-voltage dependent thyristor controlled pre-charging of output capacitors in a three-level pulse rectifier system The invention relates to an apparatus for initial charging of the output capacitors of a three-phase three-point pulsed rectifier system. According to the invention, a thyristor is arranged in each phase between the input terminal and is connected in the ... | 04/23/2002 |
| 6055167 | Pulse width modulated boost converter integrated with power factor correction circuit An integrated power factor converter utilizes a silicon controlled rectifier (SCR) bridge which limits the inrush current by controlling the conduction angle of the SCR's. The same SCR bridge shuts down the output in case of short circuit and recovers aut... | 04/25/2000 |
| 6018473 | Power supply and printing machine containing same A power supply includes a diode bridge rectifier. The diode bridge rectifier output provides direct current to a primary capacitor. A current-limiting resistor is connected in series with the rectifier output and the primary capacitor. The current-limitin... | 01/25/2000 |
| 5923550 | Interference reduction by harmonic phase shift in multiple PWM rectifier operation A method and apparatus for reduction of radio frequency interference caused by pulse width modulation of rectifier switching devices (56A, 56B, 58A, 58B) in multiple rectifiers 50 connected to a common power source. In general, the invention reduces radio... | 07/13/1999 |
| 5852556 | Power converter A power converter comprises a pulse generator capable of outputting two different levels of gate power. A thyristor (LTT) is turned on by the first gate power output from the pulse generator, and the second gate power is supplied to the thyristor (LTT) du... | 12/22/1998 |
| 5742189 | Frequency conversion circuit and radio communication apparatus with the same A frequency conversion apparatus comprising a sampling circuit for receiving a first intermediate frequency signal extracted from an input signal and having a predetermined intermediate frequency and a predetermined band width and sampling the first inter... | 04/21/1998 |
| 5572415 | DC voltage supply circuit for rectifying an AC input voltage to provide a substantially constant DC output voltage A circuit is provided for rectifying an AC input voltage to provide a substantially constant DC output voltage. A composite input voltage is derived from the AC input voltage, which is composed of a scaled input AC voltage shifted by a selected DC bias vo... | 11/05/1996 |
| 5513093 | Reduced open circuit voltage power supply and method of producing therefor A method and apparatus for providing an ac signal to load terminals, where the signal has a reduced open circuit voltage is disclosed. The apparatus includes an ac current source connected to the load terminals and an open circuit sensor. A control circui... | 04/30/1996 |
| 5485362 | Resonant power converter for changing the magnitude of a DC voltage The present invention provides a resonant power converter for changing the magnitude of a DC voltage. The converter includes a common magnetic core with three legs (an "EE" core). The core has primary and secondary windings wound onto a first outside leg,... | 01/16/1996 |
| 5483192 | Gate power supply circuit A gate power supply circuit including a switching device and a gate drive circuit connected to the switching device for generating a gate signal to be supplied to a gate of the switching device. The gate power supply circuit further includes a series circ... | 01/09/1996 |
| 5430637 | Method and apparatus for power supply with gated charge filter A power supply circuit limits the voltage on a filter capacitor driven by rectified half-cycles of an input AC waveform. A FET switch in series with the current charging the filter capacitor is opened as soon as the charge on the filter capacitor is adequ... | 07/04/1995 |
| 5260863 | Control of a discontinuous current by a thyristor rectifier with inductive load For controlling the current in an inductive load, the gate current used to fire thyristors in a rectifier is controlled to reach zero at exactly the same time, within a given half-wave, as the current in the inductive load which receives the voltage from ... | 11/09/1993 |
| 5155673 | Thyristor converter protection method and apparatus A method and apparatus for protecting thyristors in a power converter from overvoltages. Voltage detectors determine if the forward voltage of each thyristor has increased in the converter. If such an overvoltage occurs during a predetermined period after... | 10/13/1992 |
| 4959321 | Cell fusion apparatus Cell electrofusion apparatus, for example for the production of hybridomas, comprises a flow-through capillary (14) surrounded by a water-cooled jacket (16) and through which a physiologically normal medium (such as a tissue culture fluid) containing cell... | 09/25/1990 |
| 4868731 | Gate control circuit for a GTO thyristor The circuit contains a separate firing and extinguishing circuit, each having a respective capacitive charge store for generating the firing and the extinguishing current pulses for a GTO thyristor. A fast switching element which can be directly activated... | 09/19/1989 |
| 4833587 | Semiconductor switching circuit A fraction of current passing through the P-emitter region and N-base region of a thyristor is by-passed to the base-emitter junction of a PNP transistor. The amount of the base current is dependent on the thyristor current. Thus, as the anode current of ... | 05/23/1989 |
| 4775925 | Method and apparatus for determining the control electrode to cathode junction voltage of a control turn-off semiconductor device and use of such determined voltage in the control of the device An apparatus and method relative to the operating of a control turn-off semiconductor device provide for determining the actual control electrode to cathode voltage upon the application of a turn-off control signal by adjusting the apparent value of that ... | 10/04/1988 |
| 4730352 | Supply circuit for an X-ray emitter usable in radiology The invention relates to a supply circuit for an X-ray emitter usable in radiology. The circuit has a transformer, whereof the primary is connected to the three-phase power supply and whereof the secondary is connected to the X-ray emitter. The primary ci... | 03/08/1988 |
| 4730245 | Power cut detection apparatus for power converter A power converter having an ac side connected through a reactor to an ac power source and a dc side connected to a smoothing capacitor and a load, the converter being capable of converting and inverting electric power in accordance with the pulse width mo... | 03/08/1988 |
| 4593348 | Device for the generation of regulated and/or adjustable direct voltages or direct currents A device is described for the generation of drive signals for thyristors or power transistors in circuits for the energy supply of apparatuses and installations with regulated and/or adjustable direct voltages or direct currents. In systems with a master ... | 06/03/1986 |
| 4547843 | Multiple output DC power supply A multiple output DC power supply having a single closed loop control system for two or more power amplifiers which provide matched DC outputs. The control system is responsive to the sum of the DC signals output from the power supply to derive an average... | 10/15/1985 |
| 4504777 | Control circuit for holding constant the operating voltage of an electric load A control circuit for supplying a relatively constant operating voltage to an electrical load over a relatively wide range of supply line voltages, including an electronic switch connected in series with the electrical load and having a control lead, a re... | 03/12/1985 |
| 4480298 | Multiple output DC-to-DC voltage converter apparatus A voltage converter apparatus is provided to energize a first load and a second load from a power supply connected through an inverter and a coupling transformer, with the transformer having a first secondary winding energizing the first load with first v... | 10/30/1984 |
| 4456871 | Power supply for electronic control system An inexpensive power supply for an electconic control system or the like which is capable of converting a wide range of applied AC voltages into a regulated output voltage. A thyristor is coupled in series with an input terminal and a threshold device, su... | 06/26/1984 |
| 4322817 | Switching regulated pulse width modulated push-pull converter A switching regulated push pull converter which includes voltage and current feedback loops to provide a highly regulated output voltage throughout a 100 percent load range. This circuit also provides a semi-regulated auxiliary output voltage which can be... | 03/30/1982 |
| 4257091 | Electrical power converter thyristor firing circuit having noise immunity A power control circuit has a thyristor bridge interposed between a.c. buses connected to an a.c. power supply and a load. The firing circuit for the thyristors of the bridge includes a light actuated controlled rectifier for generating firing pulses. Two... | 03/17/1981 |
| 4228494 | Constant current source A constant current circuit including a silicon controlled rectifier connected to transmit current flow from an ac supply to a load. A sensor circuit provides a load signal having a level dependent upon the current flow through the load and a reference cir... | 10/14/1980 |
| 4222097 | Control of high-voltage D.C. transmission systems In a control apparatus for connecting three-phase current systems having respectively different frequencies to a high-voltage D.C. transmission system, the apparatus including at least two units connected to operate in parallel during normal operation and... | 09/09/1980 |
| 4209738 | Regulation circuit A regulation circuit for providing timing gate signals to the dc power section of a power supply, the regulation circuit utilizing phase angle conduction of a programmable unijunction transistor. The conduction angle is determined by the occurrence of the... | 06/24/1980 |
| 4204267 | Digital control device for d.c. thyristor-pulse converter The proposed digital control device controls a d.c. thyristor-pulse converter and comprises a decoder connected to a clock pulse counter and a reversible counter. The device further includes a control unit, a matching unit containing four AND gates and a ... | 05/20/1980 |
| 4164016 | Current sensing system A circuit for sensing the current applied to a load in power supplies, inverters, and other power conversion equipment and similar systems wherein the voltage between the center tap of the transformer secondary winding and the junction of two resistors co... | 08/07/1979 |
| 4152758 | Control logic for a phase controlled rectifier system Apparatus for providing firing signals to a phase controlled rectifier circuit at a time at which valves in the rectifier circuit are forward biased without the need for providing continuous firing signals. The apparatus monitors the voltage applied acros... | 05/01/1979 |
| 4122517 | Thyristor control method for thyristor AC-DC converter In an AC-DC converter for converting an AC power by a six-phase, half-wave or three-phase, full-wave back-to-back or anti-parallel connection thyristor bridge to a DC power for input to a load, while the current to the load is small, the converter is actu... | 10/24/1978 |
