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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 7679216 | Power supply scheme for reduced power compensation A power control system is described that reuses current from segregated circuits of the mobile device. In some embodiments, the segregated circuits (or “sections”) can be “stacked” in series (with respect to the power supply) such that power is more efficien... | 03/16/2010 |
| 7485987 | Power converting device A power converting device includes a single-phase multiplex converter used as an active filter and a control device. The single-phase multiplex converter includes multiple single-phase inverters connected in series at AC output sides. Each of the single-phase invert... | 02/03/2009 |
| 7208894 | Electric vehicle motor and control system with high efficiency regeneration The present invention is an electric vehicle power system that uses multiple permanent magnet motor/generators connected in series or parallel and multiple battery step switching. Motor, torque and speed are controlled by steps in series connection and then in paral... | 04/24/2007 |
| 7030512 | Dynamic current sharing dc-dc switching power supply A power supply in an embodiment of the invention includes a plurality of dc—dc switching power converters, each of which has its input isolated from its output. The power converters are arranged with their respective inputs being series connected and their respect... | 04/18/2006 |
| 6552448 | Energy management system for series connected amplifiers An energy management controller (EMC) for use with series connected amplifier modules monitors the rail voltage across an energy storage capacitor which drives the amplifier modules, and compares the rail voltage with a reference voltage. The EMC controls... | 04/22/2003 |
| 6023109 | Multi-voltage control circuit of battery or multiple independent DC power Circuit of multi-voltage control circuit of battery of multiple independent DC power consists of a diode compound switch contact for resisting sparkle and segmented current when multi-voltage switches add the non-sparkle switch for series of solid switch ... | 02/08/2000 |
| 5796225 | Electric vehicle power control system The present invention utilizes batteries in series addition and through controlled switching maintains current and voltage more constant as the batteries power a consuming device. The invention is described in its application to an electric motor powered ... | 08/18/1998 |
| 5514223 | Dual discharge photovoltaic module A dual discharge photovoltaic module responsive to high and low loads. The module includes a first plurality of series connected, high short circuit current cells, and a second plurality of series connected, low short circuit current cells connected in se... | 05/07/1996 |
| 5514916 | Power unit with controlled sparking The power unit of the present invention provides an output voltage of a required value and polarity. By switching electro-mechanical switches connected between battery units and a solid-state switch connected to the output terminals in a specific order, n... | 05/07/1996 |
| 5506456 | Power unit with controlled output voltage The present invention is intended to provide an effective power unit with controlled output which can output graded output voltage in a wide range of required output voltages. The power unit also provides output voltage as a linear, chopped or PW modulate... | 04/09/1996 |
| 5461264 | Multi-voltage control circuit of battery or multiple independent DC power A power unit includes a plurality of substantially identical battery units connected in series and/or in parallel by respective switches. Said switches are actuated by a central control unit in accordance with requirements of a load. A solid switch member... | 10/24/1995 |
| 5449959 | Solar battery control switch output voltage adjustment circuit The present invention is to provide an effective newly designed circuit which can output graded multi-voltage, and further combine with linear or chopped solid switch member so as to attain series and parallel switch to adjust its output value when the vo... | 09/12/1995 |
| 5438503 | Slew rate control in a multi-level switch This invention employs timing circuitry for each voltage source in a multilevel power supply for an amplifier to control the change in voltage outputted from the associated voltage source over time or slew rate when that voltage source is switched on or o... | 08/01/1995 |
| 5352931 | Multi-voltage control circuit of tree branch network This design mainly is to provide a multi-output graded multi-voltage, and further to connect with linear or chopped wave solid switch members so as to attain non-sparkle multi-voltage switching and graded voltage combining with linear voltage adjustment, ... | 10/04/1994 |
| 5276603 | Sixteen level power supply with asynchronous controller A sixteen level power supply including four voltage sources having stepped voltage values. The voltage sources are controlled by an electronic switch assembly and may be switched into series between the positive and negative output voltage terminals. The ... | 01/04/1994 |
| 5045990 | Sixteen level power supply with asynchronous controller A sixteen level power supply including four voltage sources having stepped voltage values. The voltage sources are controlled by an electronic switch assembly and may be switched into series between the positive and negative output voltage terminals. The ... | 09/03/1991 |
| 4825141 | DC power supply device A device for supplying specified time-dependent DC current to a reactive load. The device comprises: a DC current source; a DC voltage source connected in series to the DC current source; a detector of the current in the load; a current source controller ... | 04/25/1989 |
| 4175249 | Self-reconfiguring solar cell system A self-reconfiguring solar cell array wherein some of the cells are switched so that they can be either in series or in shunt within the array. This feature of series or parallel switching of cells allows the array to match the load to achieve maximum pow... | 11/20/1979 |
| 4103335 | Line synchronized interrupt generator An interrupt generator comprising an optical coupler and a number of cascaded bidirectional one shots. The input of the optical coupler is coupled to AC powerlines which provide power to a computer. The output of the optical coupler is an isolated square ... | 07/25/1978 |
