Assignee
ACTIVE POWER INC
US·42 granted patents·8 pending applications·1,718 citations·filing 1995–2016
Top patents by PatentIndex Score
50 records- 0198US7086231B2Thermal and compressed air storage systemACTIVE POWER INC·Filed 2003·Granted Aug 8, 2006·158 cites·30 claims
- 0295US6166472AAirgap armature coils and electric machines using sameACTIVE POWER INC·Filed 1998·Granted Dec 26, 2000·73 cites·5 claims
- 0393US7693402B2Thermal storage unit and methods for using the same to heat a fluidACTIVE POWER INC·Filed 2004·Granted Apr 6, 2010·103 cites·24 claims
- 0493US6512305B1Method and apparatus having a turbine working in different modes for providing an uninterruptible supply of electric power to a critical loadACTIVE POWER INC·Filed 2000·Granted Jan 28, 2003·55 cites·73 claims
- 0591US7400052B1Transient energy systems and methods for use of the sameACTIVE POWER INC·Filed 2006·Granted Jul 15, 2008·43 cites·6 claims
- 0691US5932935AEnergy storage flywheel emergency power source and methodsACTIVE POWER INC·Filed 1997·Granted Aug 3, 1999·34 cites·27 claims
- 0791US5905321AEnergy storage flywheel apparatus and methodsACTIVE POWER INC·Filed 1998·Granted May 18, 1999·34 cites·24 claims
- 0891US5767591AMethod and apparatus for providing startup power to a genset-backed uninterruptible power supplyACTIVE POWER INC·Filed 1996·Granted Jun 16, 1998·119 cites·20 claims
- 0989US7750518B1Transient energy systems and methods for use of the sameACTIVE POWER INC·Filed 2006·Granted Jul 6, 2010·24 cites·10 claims
- 1089US7127895B2Systems and methods for providing backup energy to a loadACTIVE POWER INC·Filed 2003·Granted Oct 31, 2006·61 cites·32 claims
- 1189US6844706B2Multiple path variable speed constant frequency device having automatic power path selection capabilityACTIVE POWER INC·Filed 2002·Granted Jan 18, 2005·75 cites·58 claims
- 1286US6323573B1High-efficiency inductor-alternatorACTIVE POWER INC·Filed 2000·Granted Nov 27, 2001·27 cites·15 claims
- 1385US7030593B2Multiple path variable speed constant frequency device having automatic power path selection capabilityACTIVE POWER INC·Filed 2005·Granted Apr 18, 2006·21 cites·16 claims
- 1483US6463738B1Method and apparatus for providing a continuous supply of electric powerACTIVE POWER INC·Filed 2001·Granted Oct 15, 2002·82 cites·47 claims
- 1583US6192687B1Uninterruptible power supply utilizing thermal energy sourceACTIVE POWER INC·Filed 1999·Granted Feb 27, 2001·98 cites·49 claims
- 1682US5994794AMethods and apparatus for providing protection to batteries in an uninterruptible power supplyACTIVE POWER INC·Filed 1997·Granted Nov 30, 1999·120 cites·27 claims
- 1781US7642664B1Transient energy systems and methods for use of the sameACTIVE POWER INC·Filed 2006·Granted Jan 5, 2010·13 cites·17 claims
- 1880US6029538AReplaceable bearing cartridge assembly for flywheel energy systemACTIVE POWER INC·Filed 1997·Granted Feb 29, 2000·34 cites·34 claims
- 1979US7425807B1Transient energy systems and methods for use of the sameACTIVE POWER INC·Filed 2006·Granted Sep 16, 2008·20 cites·17 claims
- 2079US6208056B1Cartridge armatures for electro-dynamic machinesACTIVE POWER INC·Filed 1997·Granted Mar 27, 2001·49 cites·14 claims
- 2177US6955050B2Thermal storage unit and methods for using the same to heat a fluidACTIVE POWER INC·Filed 2003·Granted Oct 18, 2005·18 cites·88 claims
- 2277US6642682B1Circuits and methods for preheating a rotor of a motor-generator deviceACTIVE POWER INC·Filed 2002·Granted Nov 4, 2003·41 cites·26 claims
- 2374US5874797APermanent magnet generator providing alternating current which has a selected frequencyACTIVE POWER INC·Filed 1997·Granted Feb 23, 1999·48 cites·58 claims
- 2473US5969457AEnergy storage flywheel apparatus and methodsACTIVE POWER INC·Filed 1998·Granted Oct 19, 1999·22 cites·25 claims
- 2572US7753646B1Systems and methods for cooling bearingsACTIVE POWER INC·Filed 2006·Granted Jul 13, 2010·8 cites·8 claims
- 2672US6657320B1Integrated flywheel uninterruptible power supply systemACTIVE POWER INC·Filed 1999·Granted Dec 2, 2003·67 cites·31 claims
- 2771US7918091B1Systems and methods for controlling humidityACTIVE POWER INC·Filed 2006·Granted Apr 5, 2011·4 cites·7 claims
- 2871US6255743B1Method and apparatus for providing an uninterruptible supply of electric power to a critical loadACTIVE POWER INC·Filed 1999·Granted Jul 3, 2001·60 cites·50 claims
- 2971US5864198ABrushless generatorACTIVE POWER INC·Filed 1995·Granted Jan 26, 1999·35 cites·39 claims
- 3068US6914349B2Universal uninterruptible power supply input circuitry and methods for configuring sameACTIVE POWER INC·Filed 2002·Granted Jul 5, 2005·26 cites·26 claims
- 3167US6118202AHigh-efficiency inductor-alternatorACTIVE POWER INC·Filed 1998·Granted Sep 12, 2000·22 cites·42 claims
- 3267US5920138AMotor/generator and axial magnetic bearing utilizing common magnetic circuitACTIVE POWER INC·Filed 1998·Granted Jul 6, 1999·18 cites·35 claims
- 3366US6236123B1Generator providing alternating current which has a selected frequencyACTIVE POWER INC·Filed 1999·Granted May 22, 2001·29 cites·58 claims
- 3461US6087753AHigh-efficiency inductor-alternatorACTIVE POWER INC·Filed 1999·Granted Jul 11, 2000·18 cites·15 claims
- 3557US5955816AEnergy storage flywheel apparatus and methodsACTIVE POWER INC·Filed 1998·Granted Sep 21, 1999·9 cites·16 claims
- 3656US5929548AHigh inertia inductor-alternatorACTIVE POWER INC·Filed 1997·Granted Jul 27, 1999·20 cites·28 claims
- 3755US7314059B2Systems and methods for controlling pressure of fluidsACTIVE POWER INC·Filed 2004·Granted Jan 1, 2008·6 cites·12 claims
- 3855US2014165778A1Laminated rotor apparatus and methodsACTIVE POWER INC·Filed 2013·Application pending·0 cites
- 3955US2014165777A1Systems and methods for securing a rotor apparatusACTIVE POWER INC·Filed 2013·Application pending·0 cites
- 4054US2014366684A1Insulation system for prevention of corona dischargeACTIVE POWER INC·Filed 2014·Application pending·0 cites
- 4152US6124702AStep switch cycloconverter utilizing multi-tap armatureACTIVE POWER INC·Filed 1998·Granted Sep 26, 2000·18 cites·51 claims
- 4250US2007022754A1Thermal storage unit and methods for using the same to head a fluidACTIVE POWER INC·Filed 2005·Application pending·0 cites
- 4347US9209663B2Apparatus and methods for passive magnetic reduction of thrust force in rotating machinesACTIVE POWER INC·Filed 2013·Granted Dec 8, 2015·0 cites·36 claims
- 4443US6777823B1Integrated continuous power system assemblies having multiple nozzle block segmentsACTIVE POWER INC·Filed 2001·Granted Aug 17, 2004·3 cites·8 claims
- 4542US6408627B1Integrated continuous power system assembliesACTIVE POWER INC·Filed 2001·Granted Jun 25, 2002·3 cites·31 claims
- 4641US2014167533A1Rotor assembly apparatus and methodsACTIVE POWER INC·Filed 2013·Application pending·0 cites
- 4739US2016322881A1Integrated motor generator flywheel with rotating permanent magnetACTIVE POWER INC·Filed 2016·Application pending·0 cites
- 4838US2011215645A1Containerized continuous power system and methodACTIVE POWER INC·Filed 2010·Application pending·0 cites
- 4935US2014361624A1Apparatus and methods for control of load power quality in uninterruptible power systemsACTIVE POWER INC·Filed 2014·Application pending·0 cites
- 5031US9627923B2Apparatus and methods for backfeed detection in and control of uninterruptible power systemsACTIVE POWER INC·Filed 2013·Granted Apr 18, 2017·0 cites·18 claims
Join the waitlist — get patent alerts
Get an alert when ACTIVE POWER INC files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →