Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 6949853 | Magnetic bearing device and pump device with the magnetic bearing device mounted thereto A magnetic bearing device is provided which is capable of reducing vibration, as well as electric and magnetic noise, generated from a pump device while making it possible to control the position of a rotor at high speed and high power. Also provided is a pump devic... | 09/27/2005 |
| 6770992 | Magnetic bearing apparatus To reduce vibration caused by an unbalance of magnetic force generated in a motor portion due to run-out of a rotor in a magnetic bearing apparatus having the motor portion. The vibration of the rotor is detected by means of a radial direction sensor mounted for con... | 08/03/2004 |
| 6759827 | Control circuit of brush-less motor, control circuit of sensor-less brush-less motor, brush-less motor apparatus, sensor-less brush-less motor apparatus and vacuum pump apparatus To provide a control circuit or the like of a brush-less motor capable of properly controlling current of motor windings by detecting positions of magnetic poles of a rotor at a rotational frequency of the rotor from low rotation which cannot lock a PLL circuit to s... | 07/06/2004 |
| 6755611 | Vacuum pump A vacuum pump has a casing having an interior space, an inlet port for introducing gas molecules into the interior space, and an outlet port for discharging the gas molecules from the interior space. A rotor shaft extends into the interior space of the casing for un... | 06/29/2004 |
