Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 4749934 | Intrinsically safe battery circuit An intrinsically safe battery circuit for connection between a battery and a load, such as a hand held transceiver, referred to as "HT's". The circuit includes a minor current path through a switching transistor and a major current path through a SCR. The... | 06/07/1988 |
| 4704542 | Standby power supply A standby power supply arrangement comprises a transistor with its emitter coupled to one pole of a standby battery and its collector coupled to a load. The transistor base is coupled to the other pole of the battery by way of a threshold device. When the... | 11/03/1987 |
| 4683414 | Battery economising circuit A battery economising circuit for use with one or more operating circuits, for example a part or parts of a radio circuit. In the battery economizing circuit an opposed current mirror type of current reference circuit determines entirely the current consu... | 07/28/1987 |
| 4629964 | Battery power source A regulated, low-voltage DC power source which draws energy from a standard AC outlet and uses a bank of lead-acid batteries for intermediate power storage. The power source features a multi-level charge-voltage controller which is automatically adjusted ... | 12/16/1986 |
| 4567516 | Special program decoding of scrambled subscription television transmissions This disclosure is concerned with a limited time operative decoder for special scrambled television program transmissions involving a voltage source for energizing the decoder of limited time effectiveness adapted to energize the decoder only during the l... | 01/28/1986 |
| 4493001 | Motor vehicle battery rundown protection system A system responsive to the voltage of a motor vehicle battery when the vehicle engine is not running operates to disconnect the battery from the vehicle electrical loads prior to the point at which the battery becomes too discharged to restart the vehicle... | 01/08/1985 |
| 4456097 | Elevator battery charging control An elevator system is battery powered. The battery is charged by a battery charger and also regenerated by a polyphase motor which drives the car and which is inverter operated. The charge on the battery is controlled by sensing the battery voltage and, i... | 06/26/1984 |
| 4413220 | Battery discharge rate control circuitry Techniques are disclosed for supplying positive and negative voltages to electrical components in a system where power demand from the components needing voltage of one polarity is different from the power demand from components needing voltage of the oth... | 11/01/1983 |
| 4403279 | Vehicular plural voltage system A precision regulated plural voltage system having particular application for vechicular electrical systems requiring dual voltage applications. The output of a voltage doubler is precisely regulated as a function of the regulated output voltage from the ... | 09/06/1983 |
| 4395639 | Uninterruptible power supply with battery back-up A charger in the form of a primary switched rectifier and transformer charges a battery and carries a load when the operating voltage is available to a sufficient extent. When a voltage drop or break in voltage automatically disconnects the battery from t... | 07/26/1983 |
| 4354118 | Battery backup supply control means and method An apparatus for automatically connecting and disconnecting a battery backup supply senses when the potential of a main d.c. power supply drops below a first predetermined value, and in response thereto connects the battery backup supply to an electrical ... | 10/12/1982 |
| 4346336 | Battery control system The system comprises first and second input terminals each adapted for connection to a source of charging power, first means for feeding power from the first input terminal to a first terminal of the rechargeable power source, second means for feeding pow... | 08/24/1982 |
| 4323837 | Power supply circuit for automotive vehicles A power supply circuit arrangement for automotive vehicles comprises an engine-driven alternator, a storage battery, a battery charging circuit connected between the alternator and the battery including a diode poled in a sense to conduct current from the... | 04/06/1982 |
| 4308609 | Power supply device with voltage dropping means A power supply system for an electronic device having a battery power source, a logic circuit, a voltage dropping circuit which drops the voltage of the battery power source to produce a dropped voltage, and a load circuit to drop the output voltage of th... | 12/29/1981 |
| 4297590 | Power supply system A power supply system includes three sets of batteries for supplying direct current to a load. Three sets of switches connect mutually respective sets of batteries to the load. A controller operates the switching means so that at any time at least two of ... | 10/27/1981 |
| 4240021 | Solar cell battery charging control system A solar cell battery charging control system having a storage battery and a plurality of solar cells connected in series for charging the storage battery, which system comprises a heavy load means adapted to be driven by the storage battery to discharge t... | 12/16/1980 |
| 4237385 | Control of power supply A power supply control system suitable for controlling and protecting batteries used in such systems by causing the automatic disconnection of the battery from a load when either the battery voltage has dropped to a preset level or when the load has open ... | 12/02/1980 |
| 4218717 | Electric control system for motor vehicle An electric control system is provided for a motor vehicle which automatically disconnects electric loads from the battery of the vehicle when the vehicle is not in use, and in the event that the driver leaves the vehicle without turning off the headlight... | 08/19/1980 |
| 4210855 | Apparatus for regulating the current drawn from an electric battery A difference amplifier compares the sum of a signal corresponding to the voltage across the battery and a signal corresponding to the current through the battery to a reference signal. When the output of the difference amplifier indicates that the sum of ... | 07/01/1980 |
| 4179649 | Voltage supply apparatus powered from a vehicular electrical system A series regulating transistor supplying voltage to a supply bus from a vehicular battery in which circuitry samples voltage from the supply bus for generating a correction signal for controlling operation of the regulating transistor. A first switching t... | 12/18/1979 |
| 4146829 | Battery dissipation limiter circuit A circuit which protects a battery powered, pulse controlled, constant current power supply from excessive power dissipation. Voltage controllers disconnect the power supply from an associated battery, a predetermined time after current flows in the power... | 03/27/1979 |
| 4129817 | Stepped voltage power supply with equalized discharge of battery cells The adjacent terminals of adjacent battery cells are grouped in regularly spaced pairs of contacts. A first commutating member has a plurality of regularly spaced contact members effective to connect the contacts of each pair but one and is movable sequen... | 12/12/1978 |
| 4081743 | Cell discharge voltage monitor circuit for cell capacity grading and method for grading A circuit utilized in a cell capacity grading machine for discharging a cell to a predetermined cell voltage which approximates the total discharge of the capacity of the cell. An indicator is provided for automatically indicating the termination of disch... | 03/28/1978 |
| 4025935 | Camera with means for maintaining a constant DC supply voltage The exposure control circuit of the camera requires a supply voltage which must have an amplitude exceeding a predetermined minimum amplitude. The camera battery is subject undesired decreases in battery output voltage. A transverter circuit has an input ... | 05/24/1977 |
| 4017779 | Battery isolator First and second batteries each connected in parallel with a load and a battery isolator connected between the first battery and the second battery and the load including a series pass transistor connected in series with the first battery and the load and... | 04/12/1977 |
| 3996064 | Electrically rechargeable REDOX flow cell There is disclosed a bulk energy storage system including an electrically rechargeable reduction-oxidation (REDOX) cell divided into two compartments by a membrane, each compartment containing an electrode. An anode fluid is directed through the first com... | 12/07/1976 |
| 3975670 | Overvoltage protector for battery operated devices The present invention has reference to a voltage control circuit for a battery operated device. Such circuits are adapted for use in connection with buoys, signal lights, vehicles and other devices where exhaustion, internal resistance, polarization or ot... | 08/17/1976 |
| 3956638 | Battery paralleling system An indefinite number of batteries is connected in parallel to provide current to share a load. Each individual battery current is compared to an average value to regulate each battery controller so that each battery supplies its share of the current.... | 05/11/1976 |
