Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7489856 | Electrical device for automatically adjusting operating speed of a tool Electrically powered devices are provided that are generally capable of automatically adjusting an operating speed of a tool removably connected to the device. The device includes circuitry that evaluates tool wear for the tool removably connected to the device, pro... | 02/10/2009 |
| 7253578 | Pivoting apparatus of industrial robot There is provided a pivoting apparatus of an industrial robot including: a brake 40 that is fixed to a motor shaft 30s of a motor 30 to halt the motor 30; an encoder 50 that is fixed to the motor shaft 30s to d... | 08/07/2007 |
| 7164249 | Fan control device and method A fan control device receives a reference revolution signal to control the rotation speed of a fan. The fan control device includes a reference signal generating module, a revolution modifying module and a fan driving module. The reference signal generating module g... | 01/16/2007 |
| 7034477 | Domestic electrical appliance including an electric motor Domestic electrical appliance, including a universal electric motor powered by direct current via an electrical circuit linked to a DC electrical voltage source, said circuit including a chopper arrangement, including a capacitor in parallel with the DC voltage sour... | 04/25/2006 |
| 6201929 | Multistage rotating speed control circuit for DC motor The present invention provides a multistage rotating speed control circuit which is connected to a positive DC supply voltage and controls the rotating speed of the DC motor. The multistage rotating speed control circuit comprises a digital control circui... | 03/13/2001 |
| 6037726 | Electric motor vehicle An electric motor vehicle comprises as a drive system a battery, a motor, and a controller for controlling the rotation of the motor. The electric motor vehicle disposes an accelerator for controlling speed of the motor, a key switch for turning on or off... | 03/14/2000 |
| 6021252 | HVAC fan-powered terminal unit having preset fan CFM An arrangement is disclosed for controlling fan motors in fan-powered terminal units which permit the air flow of the terminal units to be factory preset and reset using a voltmeter. The fan motor is responsive to the pulse width of pulses of a pulse widt... | 02/01/2000 |
| 5990582 | Computer fan speed control device A cooling system for cooling components of a computer is provided. The cooling system includes a DC fan which operates at a speed which is substantially proportional to the voltage that is applied to the fan. A zener diode voltage divider is connected in ... | 11/23/1999 |
| 5745647 | Method and apparatus for automatically controlling and scaling motor velocity A method and apparatus automatically associate a sensed mechanical parameter to a range of motor velocity for controlling the rotational velocity of a motor driving a medical instrument. The method and apparatus sense or measure the mechanical parameter w... | 04/28/1998 |
| 5528721 | Direct current motor speed control apparatus A DC motor control system reduces power demands imposed upon a DC power source energizing a utilizing device by varying the time during which power application occurs, but not the magnitude of the power which remains constant. The DC motor control system ... | 06/18/1996 |
| 5455886 | Electrical implement with variable speed control An electrical implement having a bypass mechanism for controlling a variable speed motor is disclosed. The implement includes a tool, a variable speed electrical motor activatable for driving the tool, a housing supporting the motor and tool, and a contro... | 10/03/1995 |
| 5371445 | Switching device for controlling two electric motors at different speeds A system, which may be a cooling system for a motor vehicle engine, has two direct current motors together with switching circuits which provide selective connection of the windings of the two motors to a direct current voltage source in such a way as to ... | 12/06/1994 |
| 5331258 | Synchronous-rectification type control for direct current motors and method of making A MOSFET control topology and a physical structure for a motor control which provide a more efficient and economic DC motor control are disclosed. The control topology introduces a synchronous-rectification technique wherein free-wheel diodes are replaced... | 07/19/1994 |
| 5293103 | Quiet fan speed control with linear adjustment actuator A fan speed control adjusts the speed of an electric fan motor without producing audible noise at frequencies above about 60 Hz. A linear slide switch is positionable in each of four discrete positions to connect various capacitances in series with the mo... | 03/08/1994 |
| 5201509 | Method and device for controlling a drive unit of a pile-lifting device at a sheet-fed printing machine A method of controlling a drive unit of a pile-lifting device located at a sheet-fed printing machine includes starting-up the drive unit with a first mode of operation selected by an electronic current wherein rated torque is high and rated speed is low ... | 04/13/1993 |
| 5123079 | DC motor and controlling system therefor A dc motor wherein a driving force thereof can be used effectively with a simple and compact mechanical construction and a motor controlling system which can control such a dc motor to be driven efficiently. The motor comprises at least two coils, and cha... | 06/16/1992 |
| 5029230 | Motor control apparatus and speed setting apparatus A motor control apparatus for a sewing machine includes an adjustable speed setter for generating a speed set signal. A first memory stores a plurality of reference values each defining a reference region into which the speed set signal can fall. A second... | 07/02/1991 |
| 4893942 | Membrane potentiometer speed selection control for an electric food mixer An electric food mixer includes a membrane potentiometer control which is responsive to a user's touch to select the speed of the mixer's motor. The top surface of the membrane potentiometer control is flexible and forms a continuous strip which is mounte... | 01/16/1990 |
| 4309631 | Kitchen mixer having means to instantaneously increase speed when desired A kitchen mixer having a centrifugal speed control in which a control contact is positioned by a follower engaging a cam linked to a rotatable speed-selector knob. The cam has two levels so that by pressing the cam downward by means of a button on the out... | 01/05/1982 |
