Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4631460 | Driving device having a reversible electric motor A driving device for a reciprocating control member, preferably for a keyboard in a lock for doors of a motor vehicle, has a reversible electric motor controlled by a switching device. The electric motor controls the control member via a reduction gear. T... | 12/23/1986 |
| 4629950 | Variable automatic forward/reverse control device for baby cart This invention is a variable automatic forward/reverse control device for an unattended baby cart which is particularly designed for the housewife who is too busy at home to take care of her baby in the cart. Placing the baby in this cart equipped with th... | 12/16/1986 |
| 4618807 | Reversing contactor for a three-phase motor This invention pertains to a three-phase reversing contactor with fixed-mounted contact parts serving the input and the output, and a connection by contact bridges from the input to the output. A common drive mechanism is provided for all the contact brid... | 10/21/1986 |
| 4559483 | Control device for increasing speed of actuation of an electromagnetic consumer, particularly in an internal combustion engine The actuation speed of an electromagnetic consumer is increased by means of a charged capacitor which is connected in series with a consumer at such a polarity that its voltage is added to that of the power source. In one embodiment, the capacitor is swit... | 12/17/1985 |
| 4551660 | Motor controlling switch device A switch device for controlling an electric motor which is used, for example, in a power window or sunroof of an automobile. The switch device includes a magnetically attractive piece, an electromagnet, sets of electrical switch contacts, and a spring coi... | 11/05/1985 |
| 4543515 | Motor controlling switch device A motor controlling switch device in which, when the motor is stopped in locking manner, an operating member for operating the switch and for applying current to the motor is returned from an operating position to an original position. The magnetic force ... | 09/24/1985 |
| 4494181 | Circuit arrangement for determining the polarity and magnitude of the load current in a reversible d-c controller or chopper A circuit arrangement for determining the polarity and the magnitude of the load current in a reversible d-c controller includes a bridge circuit comprising two pairs of bridge arms connected to opposite terminals of the voltage supply bus. Each pair of b... | 01/15/1985 |
| 4477751 | Motor brake device A motor brake device comprises a plurality of transistors for shunting a circuit loop through which a back electromotive force current caused by an inertia rotation of the motor flows, in which some of these transistors are operated as an inversed transis... | 10/16/1984 |
| 4475072 | Patient-positioning X-ray table An X-ray table having an elevator mounted on a base for vertical movement, an intermediate support mounted on the elevator for moving longitudinally, and a carriage with a patient cradle on it for moving longitudinally on the support. A pair of gas spring... | 10/02/1984 |
| 4446406 | Brushless DC motor driving circuit A driving circuit for a brushless DC motor is connected to energize the plurality of stator windings by detecting induced voltages in windings adjacent an energized winding, mixing these detected voltages in predetermined ratios, and comparing the mixed v... | 05/01/1984 |
| 4438378 | Motor drive apparatus A reversible motor drive circuit for driving a motor in a first direction and thereafter driving the motor in a second direction opposite to said first direction. The circuit includes a first flip-flop having cross-coupled 1st and 2nd PNP transistors. The... | 03/20/1984 |
| 4425535 | Erroneous start preventing device for battery-powered vehicle A solid-state device of simple construction for preventing an erroneous start of a battery-powered vehicle, whereby an acceleration and deceleration controller is not actuated if a DC power supply is connected to a reversible motor by turning on a power s... | 01/10/1984 |
| 4412160 | DC Motor driving apparatus A dc motor driving apparatus comprising a full-wave rectifier bridge circuit for supplying dc power to a dc motor and a dc motor driving control circuit for controlling the turning on and off of thyristors forming the full-wave rectifier bridge circuit, f... | 10/25/1983 |
| 4410844 | Sliding door actuating mechanism An actuating mechanism for sliding doors is intended to be installed in a van. A winch (44) is mounted inside of the van. A guide assembly (50) is installed in an aperture in the door frame. A cable (52) is connected to an arm added to the latch operating... | 10/18/1983 |
| 4379985 | Bipolar driver with illegal code detector A bipolar driver controls the operation of a reversible polarity load such as a motor. The driver links one terminal of the motor with either a positive or a negative potential power supply in response to processor command signals comprising a combination... | 04/12/1983 |
| 4367435 | Motor control system A digital servo control system for a d.c. motor to achieve stepping motor precision and a wider speed control range than either a conventional d.c. motor or a stepping motor, as may be typically utilized in an IV syringe pump. Motor position and direction... | 01/04/1983 |
| 4357564 | Closure operator control A motorized operator is used for control of a closure, e.g., a garage door operator. Where the garage door is an upward opening door, there are four conditions for operation of the control system, namely stop-down, run-up, stop-up, and run-down. The prese... | 11/02/1982 |
| 4337423 | Dual output switching circuit A switching circuit provides first and second output signals to respective first and second output load devices that are switched responsive to an input signal. The switching point of the first output signal is set relative to the switching point of the s... | 06/29/1982 |
| 4336482 | Rear window wiper motor control A windshield wiper system having an electric motor for driving windshield wipers through repeating wiper cycles by reversing the direction of rotation of the motor through a reversing switch comprising a pair of relays which control the polarity of curren... | 06/22/1982 |
| 4306180 | Directional control system A circuit for controlling the drive direction of an electrically-driven vehicle, the circuit having a plurality of spring return input switches (20) each actuation of which changes the direction of the vehicle, via a flip-flop circuit (21), an amplifier (... | 12/15/1981 |
| 4303810 | Two speed switch A two speed switch (20) for electric motors permits both forward and reverse operation of the motors and eliminates the possibility of simultaneous operation of the switch in both directions. The switch (20) includes a housing (50, 80) for receiving a con... | 12/01/1981 |
| 4303872 | Telescoping antenna movable by means of a d.c. motor An antenna control system employing a d.c. motor for extending and retracting a telescoping antenna for use on a vehicle. The control system comprises a polarity responsive timer, a polarity reversal switch, and a switching device. In one position of the ... | 12/01/1981 |
| 4284935 | Vehicle power seat adjuster control system A vehicle power seat adjuster control system that provides for the pulsed reversal of rotation of the armature of the operating motor of a vehicle power seat adjuster mechanism each time the operating motor is deenergized at the conclusion of each seat ad... | 08/18/1981 |
| 4275340 | Control circuit for a final control element, in particular an electric motor In order to control the motion of a final control element, for example a servomotor used in the steering gear or the cruise control of a motor vehicle, and to provide for rapid dynamic braking of the servomotor by short-circuiting, the invention provides ... | 06/23/1981 |
| 4249086 | Vehicular side mirror control A vehicular side mirror control which includes a casing, a motor unit incorporated in the casing and including a first motor adapted to rotate a vehicular side mirror in a first direction and a second motor adapted to rotate said side mirror in a second d... | 02/03/1981 |
| 4246520 | Motor control and reversing circuit A motor energizing control and reversing circuit designed to be used on a power seat control in vehicles. The circuit includes a reversible motor that primarily drives suitable gear trains which effect seat movement in a plurality of directions and then m... | 01/20/1981 |
| 4079298 | Open-loop D.C. motor of printer carriage speed Open-loop means for controlling the speed of a d.c. motor controlled print head moving across a document. A switch couples a first voltage to the d.c. motor to accelerate the print head in a first direction. When the print head reaches the desired velocit... | 03/14/1978 |
| 3978384 | Bidirectional motor drive using switched amplitude controlled current In the computer field tape handlers for magnetic tape are widely used. The magnetic tape is moved by a capstan driven by a high power low inertia motor since it is necessary to rapidly accelerate and decelerate the tape in both forward and reverse directi... | 08/31/1976 |
