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Patent Portfolio
Active Power’s focus on product leadership, customer success and environmental stewardship results in innovation worthy of patenting. The U.S. Trademark and Patent Office has granted Active Power 42 patents to date and they are listed below. Please follow the links to the US Patent and Trademark Office to review a full copy of each patent. Patent Title | Issue Date | Patent # | Magnetic Bearing and Method Utilizing Movable Closed Conductive Loops | 4/12/1994 | 5,302,874 | Magnetic Bearing with Closed Loops Which Move in AC Electromagnetic Field and/or Which Include Capacitors | 9/6/1994 | 5,345,128 | Lorentz Force Magnetic Bearing Utilizing Closed Conductive Loops and Selectively Controlled Electromagnets | 11/21/1995 | 5,469,006 | Null Flux Magnetic Bearing With Cross-Connected Loop Portions | 11/28/1995 | 5,471,105 | Magnetic Bearing With Phase-Shifted Loops | 4/16/1996 | 5,508,573 | Magnetic Bearing System Including a Generator | 6/11/1996 | 5,525,848 | Permanent Magnet Generator Providing Alternating Current Which Has a Selected Frequency | 2/23/1999 | 5,874,797 | Pulsed Power Linear Actuator & Method of Increasing Actuator Stroke Force | 7/18/1995 | 5,434,459 | Brushless Generator | 1/26/1999 | 5,864,198 | Magnetic Bearing Utilizing Brushless Generator | 11/5/1996 | 5,572,079 | Magnetically Levitated Robot & Method of Increasing Levitation Force | 11/9/1999 | 5,980,193 | Integrated Motor/Generator/Flywheel Utilizing A Solid Steel Rotor | 3/24/1998 | 5,731,645 | Motor/Generator for Flywheel Use | 8/3/1999 | 5,932,935 | Energy Storage Flywheel Apparatus & Methods | 5/18/1999 | 5,905,321 | Motor/Generator & Axial Magnetic Bearing Utilizing Common Magnetic Circuit | 7/6/1999 | 5,920,138 | Airgap Armature Coils & Electric Machines Using Same | 12/26/2000 | 6,166,472 | Energy Storage Flywheel Apparatus & Methods | 10/19/1999 | 5,969,457 | Energy Storage Flywheel Apparatus & Methods | 9/21/1999 | 5,955,816 | Method & Apparatus for Providing Startup Power to A Genset-Backed Uninterruptible Power Supply | 6/16/1998 | 5,767,591 | Method & Apparatus for Providing Startup Power to A Genset-Backed Uninterruptible Power Supply | 11/30/1999 | 5,994,794 | Replaceable Bearing Cartridge Assembly for Flywheel Energy System | 2/29/2000 | 6,029,538 | High Inertia Inductor-Alternator | 7/27/1999 | 5,929,548 | High Efficiency Inductor-Alternator | 9/12/2000 | 6,118,202 | High Efficiency Inductor-Alternator | 7/11/2000 | 6,087,753 | Step Switch Cycloconverter Utilizing Multi-Tap Armature | 9/26/2000 | 6,124,702 | Uninterruptible Power Supply Utilizing Thermal Energy Source | 2/27/2001 | 6,192,687 B1 | Cartridge Armatures for Electro-dynamic Machines | 3/27/2001 | 6,208,056 B1 | Generator Providing Alternating Current which has a Selected Frequency | 5/22/2001 | 6,236,123 B1 | Providing Uninterruptible Supply of Electric Power to a Critical Load | 7/3/2001 | 6,255,743 B1 | High Efficiency Inductor-Alternator | 11/27/2001 | 6,323,573 B1 | Integrated Continuous Power System Assemblies - Accumulator heater | 6/25/2002 | 6,408,627 B1 | Method & Apparatus for Providing a Continuous Supply of Electric Power | 10/15/2002 | 6,463,738 B1 | Method and apparatus having a turbine working in different modes for providing uninterruptible supply of power to a critical load | 1/28/2003 | 6,512,305 B1 | Circuits and Methods for preheating a rotor of a motor-generator device | 11/4/2003 | 6,642,682 B1 | Integrated Flywheel UPS System | 12/2/2003 | 6,657,320 B1 | Integrated Continuous Power System Assemblies Having Multiple Nozzle Block Segments | 8/17/2004 | 6,777,823 B1 | Multiple Path Variable Speed Constant Frequency Device Having Automatic Power Path Selection Capability | 1/18/2005 | 6,844,706 B2 | Universal Uninterrupible Power Supply Input Circuitry | 7/5/2005 | 6,914,349 B2 | Thermal Storage Unit and Methods for Using the same to Heat a Fluid | 10/18/2005 | 6,955,050 B2 | Multiple path variable speed constant frequency device having automatic power path selection capability | 4/18/2006 | 7,030,593 B2 | Thermal and compressed air storage system | 8/8/2006 | 7,086,231 B2 | Systems and methods for providing backup energy to a load | 10/31/2006 | 7,127,895 B2 |
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