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.
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.
| Application No. | Application Title | Issue Date |
| 20100237822 | Drive unit for rotating electrical machine An inverter is capable of converting a direct current from a direct current power supply into an alternating current and supplying it to an armature winding. A rectifier circuit is capable of rectifying the current, that has been converted to an alternating current by t... | 09/23/2010 |
| 20100139333 | MOTOR CONTROLLER AND DRUM WASHING MACHINE A motor controller including a vector controller that controls a permanent magnet motor including a rotor being provided with a permanent magnet having a coercivity low enough to allow modification in amount of magnetization and that executes a vector control by detecti... | 06/10/2010 |
| 20100066299 | SUPERCONDUCTIVE ROTATING ELECTRIC MACHINE DRIVE CONTROL SYSTEM AND SUPERCONDUCTIVE ROTATING ELECTRIC MACHINE DRIVE CONTROL METHOD The present invention provides a superconductive rotating electric machine drive control system that has higher efficiency and is smaller size and lighter in weight than conventional systems, and also provides a superconductive rotating electric machine drive control me... | 03/18/2010 |
| 20090315505 | SYNCHRONOUS MOTOR, MOTOR SYSTEM AND METHOD FOR OPERATING A MOTOR SYSTEM The invention relates to a synchronous motor (12,32) having a number of stator coils and an armature (16, 36) having at least one permanent magnet (17, 37) which produces a magnetic field in a main flux direction, having at least one coil winding (<... | 12/24/2009 |
| 20090072777 | FIELD WINDING TYPE OF SYNCHRONOUS ROTARY ELECTRIC MACHINE A speed-variable field winding type of synchronous rotary electric machine is provided, where a rotor with plural-phase windings faces a rotor with a field winding. A field current is limited to flow through the field winding in one direction thereof. A fundamental comp... | 03/19/2009 |
| 20090071735 | Controller of Field Winding Type Synchronous Motor, Electric Drive System, Electric Four Wheel Driving Vehicle, and Hybrid Automobile An object of the present invention is to provide a controller of a field winding type synchronous motor that can stably output torque even if the d-axis current pulsates by reducing torque pulsation without causing fluctuations in the magnetic flux acting on the torque,... | 03/19/2009 |
| 20050104550 | Synchronous motor and a rotation control method thereof, as well as, an inverter for use of the synchronous motor A rotation control method of a synchronous motor, the motor comprising: a stator having AC windings thereround; and a rotor, being mounted within said stator, rotatably, wherein on an each surface, opposing to the rotor, of poles building up the stator, are formed plura... | 05/19/2005 |
| 20050093493 | Electric power steering system for a vehicle A control system for an electric motor. Field Oriented Control, FOC, uses a digital control system, and attempts to maintain the rotating stator magnetic field ninety degrees ahead of the rotor field, in order to maximize torque. However, if a three-phase motor is used,... | 05/05/2005 |
