1
Darald R Schultz, Steven E Koenck, Jon Rasmussen, John K Rohde: Hand-held terminal with display screens, interactive screens, magnetic credit card readers, scanners, printers and handlers. Norand Corporation, Simmons Perrine Albright & Ellwood, October 21, 1997: US05679943 (245 worldwide citation)

A hand-held terminal for receiving, storing and transmitting information is disclosed. The terminal has a keyboard, a display and is powered by internal, rechargeable batteries. An internal battery charging circuit includes a fixed voltage power supply which is controlled to provide a constant curre ...


2
Terry J Parks, David S Register: Inductive coupling system for power and data transfer. Dell USA, David McCombs, James Huffman, David Hitt, October 3, 1995: US05455466 (225 worldwide citation)

A system for inductively coupling power and data to a portable electronic device. A portable device, such as a personal digital assistant, is powered or recharged via an inductive link between the device and a support unit, thereby eliminating the need for cabling or other connections therebetween. ...


3
Logan L Pease, William Wells: Device for maintaining game state audit trail upon instantaneous power failure. IGT, Townsend and Townsend, August 14, 1990: US04948138 (155 worldwide citation)

A look ahead state saving device for maintaining an audit trail of a plurality of discrete, sequential operating states in an electronic machine, such as a gaming machine. Each such state include accompanying operational data. A nonvolatile solid state memory maintains the audio trail. Game operatio ...


4
Craig L Cooper, Fred T Klein: Battery charger having temperature compensated charge rate. Phillips Petroleum Company, George E Bogatie, May 19, 1987: US04667143 (152 worldwide citation)

A battery charging circuit is disclosed which rapidly charges a battery from some level of discharge, including fully discharged, to fully charged without endangering the battery. The charging circuit includes a control circuit which provides switching type regulation responsive to current, voltage ...


5
Kurt Pittroff, Gerhard Lang, Gerhard Schwarz: Battery charging circuit. Braun Aktiengesellschaft, Robert A Shack, March 8, 1983: US04376263 (120 worldwide citation)

A battery charging circuit having an electromagnetic transformer with primary and secondary coils, a rectifier connected between the secondary coil and the battery, a first transistor connected in series with the primary coil and a resistor to form a circuit in parallel with a power source, the base ...


6
Randall J Krohn, Denis Y Yerlikaya: Battery charging circuit and method for an ambulatory feeding pump. Sherwood Medical Company, Andrew J Beck, Montgomery W Smith, Curtis D Kinghorn, July 6, 1993: US05225763 (106 worldwide citation)

A device having a rechargeable power source with an associated battery charger base having a quick charge current output and a trickle charge current output. A control circuit within the device is also provided that monitors if and for how long the device is attached to the base and determines the p ...


7
Alexander S Drapkin: Low cost battery sensing technique. International Components, Fitch Even Tabin & Flannery, October 13, 1998: US05821730 (86 worldwide citation)

A low cost load sensing technique that is suitable for use in sensing batteries in a battery charging circuit is disclosed. The circuit is adapted to be utilized in conjunction with a power supply which may include a primary converter and a voltage feedback circuit. A transformer with a dual seconda ...


8
Richard D Farris: Rapid battery charging circuit with overvoltage shunt. Symbios Logic, Wayne P Bailey, Daniel N Fishman, April 7, 1998: US05736833 (82 worldwide citation)

A circuit for charging a battery comprising a charging source, a transistor and a charge control device for switching the transistor. When saturated and switched on, the transistor permits flow of charge to the battery from the charging source. The charge control device senses when main power is los ...


9
Thomas A Somerville: Compact low noise low power dual mode battery charging circuit. Burr Brown Corporation, Cahill Sutton & Thomas, April 19, 1994: US05304917 (80 worldwide citation)

A low noise battery charger includes a rectifier to convert AC line voltage to a rectified sinusoidal voltage that is applied to a primary winding of a transformer. Another rectifier coupled to a first secondary winding applies a charging current to a battery. A switch coupled in series with the pri ...


10
Rajendra Kumar: Portable messaging and scheduling device with homebase station. Khyber Technologies Corporation, Sand & Sebolt, July 15, 1997: US05648760 (78 worldwide citation)

A portable device (10) for selective message recordation and playback and scheduling includes a portable unit (11) and an optional homebase station (12). Portable unit (11) includes a housing (15), unit controller (20), tactile input mechanism (40), audio processor (60) and video processor (80). Por ...