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3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 8164217 | System and method for management of a DC and AC bus microgrid Systems and methods are described herein for managing the operations of a microgrid module. The microgrid module includes transformers and/or power converters necessary for modifying the input AC or DC power sources to meet the required characteristics of the output... | 04/24/2012 |
| 7763990 | Hybrid green uninterruptible power system and bi-directional converter module and power conversion method thereof A hybrid green uninterruptible power system including an input port, a boost module, a secondary battery, a bi-directional converter module, and an inverter module is provided. The boost module converts an AC utility power into a high voltage DC power. The bi-direct... | 07/27/2010 |
| 7675194 | Device for powering equipment, and an equipment power supply system A power supply device for powering equipment from at least one network supplying AC and at least one battery supplying DC, the power supply device comprising: a first branch that is connected to the main network and that comprises ... | 03/09/2010 |
| 7615886 | Electronic apparatus and computer-executable program An information apparatus 1 receiving power from a portable power source 16 is provided with an external power receiving section 17 receiving the power by connection to non-portable power sources 20 and 21; an operation section SW s... | 11/10/2009 |
| 7439633 | Power supply A switching mode power supply uses two power source inputs, an alternating current input and a direct current input. A pulse width modulation controller is used to control current from two primary windings of a transformer. The secondary of the transformer has a rec... | 10/21/2008 |
| 7394168 | Power system for a telecommunication facility Disclosed is a method of supplying DC power to equipment using proton exchange membranes (PEMs). PEMs run on hydrogen to produce DC electrical power. In the disclosed embodiment these PEMs are used as an alternative source of power to AC sources. One of these other ... | 07/01/2008 |
| 7368834 | Electronic protection devices for automatic circuit-breakers Described herein is an electronic protection device for automatic circuit-breakers comprising: a control unit; a warning interface; a supply system comprising a main supply system and a first back-up supply system; an interface for connection between said supply sys... | 05/06/2008 |
| 7363518 | Information handling system with power fault protection circuit An information handling system (IHS) employs a power fault protection circuit to protect the IHS from overvoltages which may occur on an information line from a power adapter to the IHS. The system includes a processor coupled to the protection circuit. The circuit ... | 04/22/2008 |
| 7362007 | Hybrid uninterruptible power supply system An apparatus, system, and method for supplying an uninterruptible power source to a dual power device capable of being alternately powered through either a primary power input connected to a primary power source or a secondary power input connected to a secondary po... | 04/22/2008 |
| 7327230 | Vehicle immobiliser/alarm A security system having security devices with hierarchical levels of access provided to coded keys which may be hand held transmitter units, is disclosed. The levels of access are master which is restricted to the manufacturer, seller and installer, supervisor whic... | 02/05/2008 |
| 7313714 | System and method for managing groups of modular power supplies for powering subcomponents of a computer system A system and method for dynamically managing a plurality of power supplies for a computer system has a plurality of first circuits, each of the first circuits responsive to an electrical condition of each of the plurality of power sources. A second circuit is couple... | 12/25/2007 |
| 7286556 | Local area network with electrochemical power source A power integrated local area network, such as an Ethernet network, is disclosed. The network comprises: a plurality of member network devices; and a central network device configured to communicate with the plurality of member network devices, and to deliver power,... | 10/23/2007 |
| 7250694 | Power-saving control module for an electrical appliance In a power-saving control module for an electrical appliance that includes a DC power supply and a remote control receiver, a switch component serves to make or break electrical connection between an AC power source and the DC power supply, a diode provides a path f... | 07/31/2007 |
| 7230819 | Mobile power system A mobile power system for producing power at a desired location includes a first power generating device of a first type coupled to a transportable housing, and a second power generating device of a second type coupled to the transportable housing. The first type of... | 06/12/2007 |
| 7190091 | Selectable source input power supply A selectable source input power supply is disclosed. According to one embodiment, a power supply is provided comprising an input stage including an input connector to couple the power supply to either of an AC input voltage or a DC input voltage, and an actuatable i... | 03/13/2007 |
| 7182707 | Belt-drive system driven by internal combustion engine mounted on automotive vehicle Plural auxiliary devices such as a water pump and a generator coupled to a serpentine belt-drive system are driven by an internal combustion engine mounted on an automobile vehicle. The generator is divided into a first generator having a pulley in which a one-way c... | 02/27/2007 |
| 7145265 | AC/DC hybrid power system A hybrid power system has two voltage sources, a variable DC power source, and a second power source, connected through selection components to a common node. The variable DC power source may be a solar power source and the second source may be an AC grid. The selec... | 12/05/2006 |
| 7135788 | Self contained control unit incorporating authorisation A plug-in replacement relay for automotive use incorporating a security system (43) to control the actuation of the relay is disclosed. The plug-in replacement relay derives its power supply from bridge rectifier(s) (33, 37) having their inputs connect... | 11/14/2006 |
| 7132762 | Self contained control unit incorporating authorisation A plug-in replacement relay for automotive use incorporating a security system (43) to control the actuation of the relay is disclosed. The plug-in replacement relay derives its power supply from bridge rectifier(s) (33, 37) having their inputs connect... | 11/07/2006 |
| 7081719 | Computer power supply with a display function A computer power supply with a display function has a rectifying circuit, an EMI filter, a power factor corrector, a switching circuit, a transformer and a secondary coil voltage regulator located between an AC voltage input and a DC voltage output. A linear rectify... | 07/25/2006 |
| 7017055 | Hub that can supply power actively A hub supplying power actively includes an active power supply device having a battery charger, a storage battery, a DC/DC converter, and a control circuit. The hub is connected to a USB of a computer to receive direct current (DC) of the USB. When power demand of t... | 03/21/2006 |
| 6954008 | Integrated power supply apparatus for information appliances An integrated power supply apparatus for information appliances includes a power supply input unit, a rectification unit and a voltage boosting unit. The previous design of transforming low voltage to high voltage through a voltage boosting unit (inverter) is change... | 10/11/2005 |
| 6915441 | Computer system with multiple backup management processors for handling embedded processor failure A system for providing basic system control functions upon failure of all management processors in a computer system. During normal system operation, a plurality of management processors monitor system sensors that detect system power, temperature, and cooling fan s... | 07/05/2005 |
| 6765315 | Bi-directional regulator/converter with buck/boost by fuzzy logic control An interface between software and hardware, as well as a fuzzy logic control algorithm, for controlling a DC-DC converter or an AC-DC or DC-AC inverter are provided. A control circuit receives commands from a control logic to operate a converter or inverter in vario... | 07/20/2004 |
| 6744628 | Multi-positionable power distribution unit A multi-directional power distribution unit (PDU) provides flexibility in the configuration of a computer system, disk drive array or other enclosure. The power distribution unit may be installed in one orientation for a power feed having a first configuration (e.g.... | 06/01/2004 |
| 6483204 | Power supply system with information exchange between plural loads and plural power sources A notebook-sized personal computer representing consumption-side hardware sends electric power data, which indicates an electric power (including voltage, alternating or direct current, cycle and wave shape) suited to the personal computer, to an electric... | 11/19/2002 |
| 6201319 | Uninterruptible power supply A power supply system has a power input to receive input power from a power source, a power output to provide output power to a load, at least one battery module having a battery output that provides battery power, at least one power module coupled to the... | 03/13/2001 |
| 5994795 | Method and a system for electrically powering electronic equipment The invention relates to an electrical power supply system for powering electronic equipment. The system uses an AC main power supply under normal conditions and uses a DC secondary power supply to supply power if the main power supply fails. The system h... | 11/30/1999 |
| 5990577 | Hub for local area network with backup power supply system A hub for a local area network according to one embodiment of the present invention includes a plurality of communication ports connected to each of nodes in the network, through which a signal is transmitted among the nodes, a signal processing circuit h... | 11/23/1999 |
| 5982652 | Method and apparatus for providing uninterruptible power using a power controller and a redundant power controller A power supply system has a power input to receive input power from a power source, a power output to provide output power to a load, at least one battery module having a battery output that provides battery power, at least one power module coupled to the... | 11/09/1999 |
| 5932934 | Circuit for the infinite direct or indirect variation of the direct and/or alternating current flowing through a load operated by a mains DC or AC voltage or an arbitrary combination thereof A circuit for continuously directly or indirectly varying a combination of direct and alternating current flowing through a load supplied with a combination of direct and alternating voltage from a public utility mains, has a low-pass filter that serves f... | 08/03/1999 |
| 5917251 | Method and circuit arrangement to cover peak energy demands in electrical alternating or three-phase current networks A method and circuit arrangement for covering peak energy demand in an electrical AC or three-phase current network having a plurality of consumers of which at least some of the consumers are equipped with a stand-by power supply network having accumulato... | 06/29/1999 |
| 5875106 | Galvanic decoupling supply unit for an electric vehicle A supply unit including a direct voltage energy source formed of a number of rechargeable batteries; an electric motor for driving the vehicle; and an electric circuit interposed between the direct voltage energy source and the electric motor. The electri... | 02/23/1999 |
| 5715156 | Method and apparatus for providing AC or DC power for battery powered tools Method and apparatus for providing either AC mains or DC power for an electrically powered tool having a motor designed to be powered by a removable battery pack which fits into a recess in the tool. The apparatus includes a power block capable of being p... | 02/03/1998 |
| 5631504 | AC/DC power supply An AC/DC power supply includes an input sensing circuit for sensing whether the input connector is connected to an AC voltage source or to a relatively lower amplitude DC voltage source. When connected to the AC voltage source, a control circuit connects ... | 05/20/1997 |
| 5608275 | Fault tolerant isolation between devices powered by separate power sources A fault tolerant isolation system providing fault tolerant electrical isolation between different components receiving power from separate power sources regardless of which of the power sources fails. One power source provides operating voltage to an isol... | 03/04/1997 |
| 5514915 | Shunt connected superconducting energy stabilizing system A shunt connected energy stabilizing system with isolation switching for providing stored energy to loads or to a utility or industrial electrical distribution system or source of electrical power. An energy backup and recovery system stores energy in a s... | 05/07/1996 |
| 5477091 | High quality electrical power distribution system The system comprises a central module supplying a distribution network, for example formed by a bus, with permanent DC power. Terminal modules, located near the loads, convert the DC power distributed by the distribution network into DC or AC electrical p... | 12/19/1995 |
| 5418403 | System for conveniently providing load testing termination of an AC power source having at least one battery An AC uninterruptible power source is disclosed that provides multi-phase wer output signals for actual use and a selectable single phase power output signal for use in testing. The AC uninterruptible power source further comprises at least one battery. T... | 05/23/1995 |
| 5376828 | Shunt connected superconducting energy stabilizing system A shunt connected energy stabilizing system with isolation switching for providing stored energy to loads or to a utility or industrial electrical distribution system or source of electrical power. An energy backup and recovery system stores energy in a s... | 12/27/1994 |
