Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 7248004 | Cooling fan, in particular for motor vehicles A radiator blower, in particular for motor vehicles, is indicated that comprises a plurality of individual fans (11, 12), each having an electrical drive motor (13, 14), and a plurality of switches (S1, S2, S3), each capable of bei... | 07/24/2007 |
| 7145299 | Power window control system A master controller installed in a master controller box and slave controllers installed in car doors to open and close window glasses of a car are connected by a single wire to each of slave controllers for enabling to send control signals through such a single wir... | 12/05/2006 |
| 7131754 | Automatic headlamp control An automatic headlamp control system includes an image sensor and a control. The image sensor captures an image of a forward exterior scene and the control processes the image to determine if any light sources in the captured image are indicative of headlamps of onc... | 11/07/2006 |
| 7004606 | Automatic headlamp control An automatic headlamp control system includes an image sensor, such as an imaging array sensor, and a control. The image sensor is operable to capture an image of a scene forwardly of the vehicle and the control is operable to process the image to determine if any l... | 02/28/2006 |
| 6812657 | Motor control for two motors A load in an electrical apparatus is driven by two motors M1, M2. Switching means (R1, R2) switches the motors M1, M2 between: a series configuration, in which the motors M1, M2 are connected in series across a... | 11/02/2004 |
| 5521470 | Plural commutator type motors with common parallel driving circuit At least two motors share a common driving circuit. The armatures of the motor are connected in parallel between the terminals of the power supply. Limiting resistors and choke diodes are included to prevent imbalances caused by different loads on the res... | 05/28/1996 |
| 5418436 | Motor starting method and apparatus A method for starting and operating an electric motor such as the spindle motor of a disk drive assembly employs a segmented stator winding. On startup, the winding segments are connected in series in order to maximize torque. Motor speed is detected, and... | 05/23/1995 |
| 4697124 | Integral series parallel and power brake controller for a transit vehicle An integral series parallel changeover and power dynamic brake controller apparatus for a transit vehicle disclosed. The controller utilizes a single cam shaft to operate switches for the series parallel function and the power brake function. The apparatu... | 09/29/1987 |
| 4503369 | Power supply for plural brushless DC motors A power supply in which a single variable voltage supply device is used as a power source for a plurality of motors which are simultaneously or successively rotated, in which each motor is subjected to constant current driving by a current control device ... | 03/05/1985 |
| 4495449 | Electric propulsion system for traction vehicles with automatic retard speed regulation Two separately-excited d-c electric motors are used to drive the wheels of a traction vehicle. The magnitude of motor field current varies as a function of the value of a variable control signal, which value is representative of any deviation of the field... | 01/22/1985 |
| 4371906 | Overspeed protective apparatus for a portable tool Disclosed is an overspeed protective apparatus for an electric motor having pairs of stator windings normally connected in parallel, the apparatus having an actuating mechanism responsive to an overspeed condition of the motor and an electrical switching ... | 02/01/1983 |
| 4361788 | Dual-motor drive circuit with high current switching An electrically operated dual motor drive system of the type having differentially variable left and right traction motor circuits (10,12) including left and right variable duty cycle power switches (20,22) connecting the motors (14,16) independently to a... | 11/30/1982 |
| 4251757 | Power control system and apparatus thereof Power control system comprising an intermittent device for applying intermittent voltage between intermittent voltage terminals; the intermittent device having a DC input terminal and at least one pair of intermittent terminals; a plurality of pairs of re... | 02/17/1981 |
