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"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk
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| Number | Title | Issue Date |
| 7339354 | Rechargeable battery charging method and apparatus A method and an apparatus for charging a lithium-ion based rechargeable battery in a short time is provided. A terminal voltage of the rechargeable battery is compared with a predetermined first set voltage V1 while charging the rechargeable battery with a co... | 03/04/2008 |
| 6768286 | Battery charger system and method for providing detailed battery status and charging method information about multiple batteries A battery charger method and apparatus are disclosed for providing detailed battery status and charging method information for a selected one of multiple batteries that are simultaneously coupled to the battery charger. The battery charger includes a controller. The... | 07/27/2004 |
| 5694022 | Variable pulse recharging battery pack A battery pack for an electrical device contains rechargeable batteries for supplying power to the electrical device and a transformerless pulse charging circuit. The pulse charging circuit generates a pulse charging current from received AC current, and ... | 12/02/1997 |
| 5686817 | Battery charger having microcomputer for adjusting charging current A battery charger includes a microcomputer operable to receive an input value corresponding to a value of charging current. A thyristor has the gate connected to an output port of the microcomputer. The microcomputer operable to adjust the firing angle of... | 11/11/1997 |
| 5248928 | Timed battery charger A charger 10 includes facility, such as a capacitor 14, for establishing a constant current source which is rectified by rectifier 16 to provide a supply of charging current at a single level in each of two successive periods of a charging cycle. The outp... | 09/28/1993 |
| 5247238 | Battery charger automatic cut-off circuit A battery charging circuit is provided with a thermally controlled cut-off switch whose normally closed contacts are in series with the main terminals of a thyristor. The thyristor is switched ON on commencement of battery charging by the charging of a ca... | 09/21/1993 |
| 4843299 | Universal battery charging system and a method A universal battery charger and recharger for electric batteries having different charging characteristics. The battery charger includes a microprocessor receiving inputs from current, voltage and temperature sensors for controlling the battery charging p... | 06/27/1989 |
| 4616171 | Battery charger including thermistor A battery charger for charging an electric battery pack has a supply rectifier connectable to the battery pack via a thyristor. A thermistor is mounted on a mechanical structure and brought into thermal contact with a cell of the battery pack to measure t... | 10/07/1986 |
| 4311920 | Emergency power source An emergency power supply designed to furnish sinusoidally varying alternating current to a load under emergency conditions is disclosed. It features a fixed phase shift between input and battery charging waveforms, and intermittent inverter operation und... | 01/19/1982 |
| 4258304 | Battery charger for electrical vehicle An on-board charger for an electric vehicle propulsion system which provides high charging capacity with minimum weight addition by sharing major elements of the electric vehicle power converter. In the preferred construction, the vehicle power converter ... | 03/24/1981 |
| 4207513 | Automatic battery charger A battery charger is provided for industrial storage batteries which includes both digital and analog control circuits for controlling the charging voltage to maintain a charging cycle in which the current is initially held to a maximum value until the ce... | 06/10/1980 |
| 4031451 | Charging circuit with SCR's triggered by pedestal and cosine modified ramp unijunction circuit having means for current limiting by controlling pedestal level A battery charging circuit gates charging current through a silicon controlled rectifier triggered by a pedestal and cosine modified ramp unijunction circuit. A battery potential sensing circuit limits the initial surge current delivered to a fully discha... | 06/21/1977 |
| 4019111 | Battery charger with automatic change from current to voltage mode control A pair of silicon controlled rectifiers are alternately triggered into their forward conductive states at points relatively early in each alternating current half cycle to provide a maximum charging current when a substantially discharged battery is to be... | 04/19/1977 |
