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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 7692321 | Power converters The present invention provides a power converter that can be used to interface a generator (4) that provides variable voltage at variable frequency to a supply network operating at nominally fixed voltage and nominally fixed frequency and including features t... | 04/06/2010 |
| 7511385 | Power converters The present invention provides_a power converter that can be used to interface a generator (4) that provides variable voltage at variable frequency to a supply network operating at nominally fixed voltage and nominally fixed frequency and including features t... | 03/31/2009 |
| 7372174 | Power converters The present invention provides a power converter that can be used to interface a generator that provides variable voltage at variable frequency to a supply network operating at nominally fixed voltage and nominally fixed frequency and including features that allow t... | 05/13/2008 |
| 7339337 | Power plant A propeller is driven by an electric motor through a mechanical drive train. The output torque of the motor to the drive train is controlled by a controller with respect to a normal torque reference signal and an emergency torque reference signal. When a measured de... | 03/04/2008 |
| 7186156 | Electric propulsion units A propulsion unit for propelling a waterborne vessel includes an electric motor arranged to provide propulsion, and a housing arranged to contain the motor. The interior of the housing is maintained at an increased pressure of above roughly 2 bar to increase the coo... | 03/06/2007 |
