Famous Patents
The ice cream cone was invented at the St. Louis Worlds Fair by Ernest Hamwi in 1904. His waffle booth was next to an ice cream vendor who ran short of dishes. Hamwi rolled a waffle to hold ice cream and the cone was born.
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 |
| 7923949 | Method for controlling polyphase rotating electrical machine A method for controlling a reversible polyphase rotating electrical machine, wherein at least one coil circuit is supplied through a bridge of switches, including the following steps: controlling (P1) the bridge to deliver to the coil circuit a periodic volta... | 04/12/2011 |
| 7282880 | Power tool and motor controller A method and apparatus to automatically reverse the motor of a power tool, such as a dispensing gun or similar tool. In some constructions, a controller automatically reverses the direction of plunger movement and removes the plunger from contact with the back wall ... | 10/16/2007 |
| 7126307 | Interface circuit for actuating an electrical device and circuit arrangement for actuating an electric motor therewith An interface circuit for actuating an electrical consumer, especially a pole-changing rotary-current induction motor, with a first contact element assigned to a signal line carrying an alternating voltage signal to generate at least two different control signals. A ... | 10/24/2006 |
| 6903524 | Electric motor-driven power steering apparatus In an electric motor-driven power steering apparatus which comprises a bridge circuit for connecting a power source between input terminals and also connecting an electric motor between output terminals and energizes the electric motor by this bridge circuit and ope... | 06/07/2005 |
| 6288517 | Hardware multiphase sinewave generator A method and circuit for controlling motors utilizing a multiple-phase sinusoidal signal generator (80) with control inputs (71,72,76) for determining motor (84) speed and direction. The multiphase sinewave generator has a synchronous-digital state machin... | 09/11/2001 |
| 5982118 | Motor with electronic distributing configuration First FET power transistors of first power amplifying parts and second FET power transistors of second power amplifying parts form current paths from a DC power source to three-phase windings. Three-phase first amplified current signals varying smoothly i... | 11/09/1999 |
| 4243920 | Control device for monitoring machines driving revolving devices and method for operating the device Control device responding to current changes in a load circuit including a supervisory circuit carrying a current proportional to the current in the load circuit, a transformer coupling the supervisory circuit to the load circuit, and an overcurrent senso... | 01/06/1981 |
| 4223744 | Reversing hammer drill A hammer drill having a bypass switch which is activated by the selector ring to prevent the drill from operating in the hammer mode by shunting the reversing switch. This is a precaution to prevent damage to the clutch teeth which are designed for ratche... | 09/23/1980 |
| 4221996 | Hoisting apparatus A hoisting apparatus and a control circuit therefor comprising a reversible electric motor drivingly connected to a hoisting drum for hauling an object up and down. The control circuit includes first and second photosensitive elements each responsive to a... | 09/09/1980 |
| 4163270 | Safety apparatus for use with a three-phase AC motor Safety apparatus for use with a three-phase AC hoist motor adapted to be connected to a three-phase AC power source, motor rotation being correct if the motor is connected to the source in correctly phased relationship but incorrect if connected with an i... | 07/31/1979 |
| 4152634 | Power contactor and control circuit The power contactor for controlling the application of power to and the character of the current to a load includes a power relay having contacts connected between a source of power and the load, such as a motor or heater, with each of the contacts being ... | 05/01/1979 |
| 3997826 | Valve operator circuit with provision for presetting A valve operator circuit normally operates to compare the pulse rates of two trains of pulses and to step an associated valve open or closed depending on which of the two pulse rates is the higher. The circuit includes a manually-operated presetting arran... | 12/14/1976 |
| 3946292 | Brushless motor driving system A driving system for reversibly rotating a D.C. brushless motor is disclosed. The system comprises Hall generators for detecting positions of a rotor, and a drive circuit for controlling conduction and interruption of current applied to stator windings ma... | 03/23/1976 |
