Bizarre Patents
A new toilet tank assembly aquarium for housing aquatic creatures.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7671549 | Method and apparatus for quiet fan speed control An AC motor speed controller includes a plurality of capacitors that may be selectively switched, by means of controllably conductive switches, into series electrical connection with an AC motor and an AC voltage source to control the speed of the motor. To change t... | 03/02/2010 |
| 7489094 | Method and apparatus for quiet fan speed control An AC motor speed controller includes a plurality of capacitors that may be selectively switched, by means of controllably conductive switches, into series electrical connection with an AC motor and an AC voltage source to control the speed of the motor. To change t... | 02/10/2009 |
| 7221858 | Pulse-width modulation motor speed control circuit A PWM motor speed control circuit (10) includes a PWM signal generator (20), a driver integrated circuit (IC) (101) and a photocoupler (30) coupled between the PWM signal generator and the driver IC. The photocoupler receives an original ... | 05/22/2007 |
| 7132808 | Solid state series motor control A solid state series motor control includes first and second FORWARD DRIVE elements, first and second REVERSE DRIVE elements, first and second diodes, a current sensor, and a capacitance. The series motor control is conf... | 11/07/2006 |
| 6809494 | Servo control system There are provided a drive unit 50 having a connection part 52 while driving a motor 61, a control unit 40 having a connection part 48 while receiving a command from a host controller 30 and sending a command to the drive un... | 10/26/2004 |
| 4992709 | Switching circuit providing adjustable capacitive series voltage dropping circuit with a fractional horsepower motor A control circuit for a fractional horsepower fan motor connected between hot and neutral wires in and AC circuit is shown. The control circuit includes two or more duplicate branches. Each branch is serially connected, and each branch includes a triac, s... | 02/12/1991 |
| 4264846 | Speed control and braking circuit for a series connected DC machine A continuous speed control and braking circuit for a DC propulsion motor having armature and field currents set largely independent of each other to permit operation in the field weakening region of the motor. A direct current control element is pulsed fo... | 04/28/1981 |
| 4259623 | Series-wound electric motor and control system for governing the speed thereof A series-wound electric motor is disclosed in which a triac or thyristor is placed in series with the armature winding and one of the field coils. Two control voltages and a reference voltage can be tapped off various points on the electric motor. By util... | 03/31/1981 |
| 3940671 | Control circuit for amusement device An operating control circuit for an amusement device of the simulated driving type, wherein the speed of the simulated vehicle is regulated by an operator-controlled accelerator and a gear shift, each electrically arranged to cooperate and interrelate so ... | 02/24/1976 |
| 3936708 | Trigger speed control switch with plastic pack semi-conductor A portable tool double-pole trigger switch enclosing a speed control circuit that includes a plastic pack SCR (semi-conductor controlled rectifier) of the sensitive gate type, a capacitor and a variable resistor. In a first version, the mounting tab of th... | 02/03/1976 |
