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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 7643312 | Method and apparatus for a wireless power supply An apparatus for a wireless power supply including a mechanism for receiving a range of RF radiation across a collection of frequencies. The apparatus includes a mechanism for converting the RF radiation across the collection of frequencies, preferably at a same tim... | 01/05/2010 |
| 7372709 | Power conditioning system for energy sources Apparatus for conditioning power generated by an energy source includes an inverter for converting a DC input voltage from the energy source to a square wave AC output voltage, and a converter for converting the AC output voltage from the inverter to a sine wave AC ... | 05/13/2008 |
| 7369417 | Method and system for producing controlled frequency power from a variable frequency power source A circuit producing power with controlled frequency from a variable frequency power source (14) includes an AC bus (20) connected to the variable frequency power source (14) and a plurality of load circuits, each load circuit including an AC inp... | 05/06/2008 |
| 7282865 | Device and method for operating a discharge lamp The invention relates to a device for operating a high-pressure discharge lamp, comprising: a switched-mode power supply circuit for supplying power to the high-pressure discharge lamp from a supply voltage, the power supply circuit comprising at least one power swi... | 10/16/2007 |
| 7276859 | Three-phase electronic ballast with improved three-phase EMI filter A ballast (20) for powering at least one gas discharge lamp (52) from a three-phase AC voltage source (30) comprises a three-phase rectifier circuit (200), a high frequency filter capacitor (300), a high frequency inverter (400 | 10/02/2007 |
| 7272008 | Portable power inverter with pass through device A portable power inverter having a pass through device to facilitate connection and operation of both A.C. and D.C. power consuming devices to a single outlet of a single D.C. power source. Inverter circuitry is electrically coupled to the external D.C. power source... | 09/18/2007 |
| 7218500 | High-voltage generator and accelerator using same In a high-voltage generator including a CW circuit (high-voltage circuit), where the CW circuit generates a high voltage through booster circuits that are provided for boosting an input voltage and connected to one another in multiple stages, a conductive shielding ... | 05/15/2007 |
| 7170261 | Generator with dual cycloconverter for 120/240 VAC operation A generator system has two modes of operation, such as 120 VAC and 240/120 VAC. The generator system has a permanent magnet generator with two independent sets of windings that each generate a three phase AC voltage. One three phase AC voltage is coupled to a first ... | 01/30/2007 |
| 7154730 | High voltage generator for electrostatic painting equipment A generator is provided inside equipment, such as a sprayer, having a high voltage cascade including a voltage-gain transformer and a voltage multiplier arranged at the output of the transformer. The transformer is a double or multiple transformer, including at leas... | 12/26/2006 |
| 7110499 | High-voltage supply for an X-ray device The disclosed, embodiments relate to a high-voltage supply (11, 13, 23) for an X-ray device. The X-ray device comprises an X-ray tube (15) and a high voltage generator(1), for generation of the high voltage necessary for operating the X-ray tube... | 09/19/2006 |
| 7102331 | Generator with dual cycloconverter for 120/240 VAC operation A generator system in accordance with the invention has two modes of operation, such as 120 VAC and 240/120 VAC modes of operation. The generator system has a permanent magnet generator with two independent sets of windings that each generate a three phase AC voltag... | 09/05/2006 |
| 7061157 | Electronic circuit for highly efficient driving of piezoelectric loads The invention relates to a circuit for highly efficient driving of piezoelectric loads, comprising a linear driving circuit portion connected to the load through an inductive-resistive connection whereto a voltage waveform is applied. Advantageously, the circuit com... | 06/13/2006 |
| 7042741 | PWM inverter control method It is an object of the invention to provide a PWM inverter control method capable of causing a reduction in a noise and energy saving to be consistent with each other by the reduction in a noise and the limit of the number of switching operations. The inventi... | 05/09/2006 |
| 7034498 | Resonant motor system In a resonant motor system, an electrical motor having a stator with one or more windings, a rotor which may or may not be wound, and an air gap between the stator and the rotor for storing magnetic energy such that the motor exhibits a definite electrical inductanc... | 04/25/2006 |
| 7027311 | Method and apparatus for a wireless power supply An apparatus for a wireless power supply including a mechanism for receiving a range of RF radiation across a collection of frequencies. The apparatus includes a mechanism for converting the RF radiation across the collection of frequencies, preferably at a same tim... | 04/11/2006 |
| 7006762 | Pulse width modulator The present invention encompasses a high efficiency pulse width modulator comprising: a variable duty cycle oscillator for receiving an input signal and providing a low level switching signal; a source voltage differentiation dependant positive switching signal circ... | 02/28/2006 |
| 6979933 | Apparatus and method for charging and discharging a capacitor An apparatus for electrically stimulating a smart material includes a controllable power source for charging the smart material and/or switching circuitry for discharging the smart material. The controllable power source includes a regulated DC to DC converter havin... | 12/27/2005 |
| 6906474 | Three-phase electronic ballast A ballast (10) for powering at least one gas discharge lamp (52) from a three-phase AC voltage source (30) comprises a three-phase rectifier circuit (200), a high frequency filter capacitor (300), and a high frequency inverter (... | 06/14/2005 |
| 6343021 | Universal input/output power supply with inherent near unity power factor An electronic method and apparatus are described for an isolated, universal input, power supply in the form of a single-ended resonant converter that utilizes capacitive energy storage versus magnetic energy storage, for converting an ac or DC input volta... | 01/29/2002 |
| 6018466 | Electronic signal conditioner An electronic signal conditioner (ESC) (10) that can be designed to operate a differential capacitive load (90) or a single-ended capacitive load (92). The ESC (10) is disclosed in four design configurations. In the first design, the ESC (10) employs a pa... | 01/25/2000 |
| 5969966 | Power converting apparatus and method using a multiple three-phase PWM cycloconverter system A power converting apparatus and a power converting method for driving a high voltage AC motor at a variable speed. Conventional invertor systems cannot solve technical subjects such as energy conservation, resource conservation, miniaturization, efficien... | 10/19/1999 |
| 5929586 | Vehicular motor driving apparatus A vehicular motor driving apparatus includes a control unit 15 for drive-controlling a motor by PWM-drive-controlling a motor driving circuit based on a motor starting signal. The control unit has a drive controller for setting a drive frequency of a PWM-... | 07/27/1999 |
| 5771471 | Charge regulator for a radio telephone An electronic device, such as a radiotelephone, is connectable to a variable-level power source. The electronic device includes a rechargeable power source which is repowered responsive to application of operative power generated by the variable-level pow... | 06/23/1998 |
| 5737196 | Electrical power generating system producing alternating and direct current The present invention is an electrical power generating system and method of operation. An inverter (18) is responsive to a DC potential for producing a fundamental frequency alternating current output such as 400 Hz. three-phase AC including harmonics. A... | 04/07/1998 |
| 5663878 | Apparatus and method for generating a low frequency AC signal An apparatus and method for generating a low frequency AC signal such as a ringing voltage signal for a telephone subscriber interface unit or the like. The apparatus comprises an oscillator which drives a pair of counters whose outputs differ by a desire... | 09/02/1997 |
| 5652699 | High-voltage and high-power stabilized DC power supply using modified sine wave output 3-phase inverter A stable DC power system of high-voltage and good-output performance is provided by adding a 3-phase inverter, whereby modified waveform for an output control is produced and a filter to a conventional DC power system and by bridge-rectifying. The modifie... | 07/29/1997 |
| 5640311 | Miniaturized high frequency direct current power supply A power supply is disclosed which is compatible with modern thin film technology which has an overall size compatible with modern miniaturized electronic components. Input power having an oscillating component in the 50/60 Hz 120/220 volt range is immedia... | 06/17/1997 |
| 5621624 | Miniaturized high frequency direct current power supply A power supply is disclosed which is compatible with modern thin film technology which has an overall size compatible with modern miniaturized electronic components. Input power having an oscillating component in the 50/60 Hz 120/220 volt range is immedia... | 04/15/1997 |
| 5590031 | System for converting electromagnetic radiation energy to electrical energy A system is disclosed for converting high frequency zero point electromagnetic radiation energy to electrical energy. The system includes a pair of dielectric structures which are positioned proximal to each other and which receive incident zero point ele... | 12/31/1996 |
| 5473530 | Four-quadrant pulse width modulated DC/AC converter A pulse width modulated DC/AC converter includes an input circuit galvanically insulated from an output circuit. The input circuit includes two branches connected in parallel to a pair of input terminals which receive a direct current voltage. Each branch... | 12/05/1995 |
| 5363286 | High voltage generator A high voltage generator comprises a transformer unit for boosting an inputted AC voltage and a rectifier unit for rectifying the AC voltage boosted by the transformer unit, the transformer unit and the rectifier unit being assembled as high voltage compo... | 11/08/1994 |
| 5321596 | DC/DC/AC power supply for a subscriber interphase unit A DC to DC switch mode power supply for a service subscriber interface unit of a fiber optic network includes a source of DC primary power, a main DC to DC switched mode power supply connected to the source of DC primary power and including switching circ... | 06/14/1994 |
| 5285365 | Power conversion system, method for controlling the same, and uninterruptible power supply using the same A three-phase a.c. uninterruptible power supply includes a transformer providing isolation between an input and an output, a single-phase inverter, and a cycloconverter. The uninterruptible power supply operates to convert a d.c. voltage into a high-frequ... | 02/08/1994 |
| 5274538 | Power conversion apparatus A power conversion apparatus comprises an inverter circuit for converting DC power into AC power which has a first frequency; a transformer connected to the inverter circuit. A cyclo converter circuit having a bidirectional switch controls a direction in ... | 12/28/1993 |
| 5272612 | X-ray power supply utilizing A.C. frequency conversion to generate a high D.C. voltage An output voltage of an A.C. power source is input to an frequency converter and the frequency thereof is increased. A plurality of high voltage transformers of small capacity each of which has a secondary winding of a small number of turns and which are ... | 12/21/1993 |
| 5270914 | Series resonant converter control system and method An apparatus and method is disclosed for an improved control system for a series resonant converter for transferring power between a source and a load. The control system comprises a series resonant circuit including a capacitor and an inductor with a fir... | 12/14/1993 |
| 5053936 | Frequency/voltage converting device A frequency/voltage converting device includes a frequency/voltage converting means for converting a DC voltage corresponding to the frequency of an input signal, a reverse-polarity ripple voltage outputting device for outputting a ripple voltage which is... | 10/01/1991 |
| 5010471 | Three-phase AC-to-AC series resonant power converter with reduced number of switches An apparatus and method is disclosed for an improved AC--AC series-resonant converters incorporating power pulse modulation with internal frequencies of tens of kHz is applied to a series-resonant converter system for generating synthesized multiphase bip... | 04/23/1991 |
| 4969080 | A method of decoupling a three-phase converter A method of operating a three-phase converter to produce a signal at an output frequency by decoupling and digitally sampling inverter input signals and load voltage signals and feeding the resultant phase signals back into the inverter. The phase voltage... | 11/06/1990 |
| 4931919 | System for converting variable frequency multiple phase alternating current into constant frequency multiple phase alternating current with neutral A system for converting variable frequency multiple phase current into multiple phase current of constant frequency with a neutral having a multiple phase inverter with a neutral (N) is disclosed. A first input (34) is connected to the multiple phase inve... | 06/05/1990 |
