Inventor · disambiguated record
Douglas Karraker
Also filed as: KARRAKER DOUGLAS · KARRAKER DOUGLAS W
7 granted patents·1 pending application·182 citations·filing 1995–2014
86Inventor score
Top patents by PatentIndex Score
8 records- 0196US6448735B1Controller for a wound rotor slip ring induction machineABB AUTOMATION INC·Filed 2001·Granted Sep 10, 2002·87 cites·26 claims
- 0291US6741059B2Controller for a wound rotor slip ring induction machineABB AUTOMATION INC·Filed 2002·Granted May 25, 2004·47 cites·26 claims
- 0380US7948721B2AC motor bypass with fault annunciation, serial communication and fault tolerant coil controlABB INC·Filed 2008·Granted May 24, 2011·15 cites·20 claims
- 0460US7154277B2Method and apparatus for detecting faults in AC to AC, or DC to AC power conversion equipments when the equipment is in a high impedance modeABB INC·Filed 2004·Granted Dec 26, 2006·17 cites·8 claims
- 0546US9419529B2DC bus voltage measurement circuitABB INC·Filed 2014·Granted Aug 16, 2016·0 cites·20 claims
- 0646US8653823B2Detection of welded switch contacts in a line converter systemGOKHALE KALYAN P·Filed 2011·Granted Feb 18, 2014·1 cites·21 claims
- 0746US5623219AMaximal voltage three-phase PWM without third harmonic injectionFiled 1995·Granted Apr 22, 1997·15 cites·6 claims
- 0839US2011299312A1Inverter for solar cell arrayKARRAKER DOUGLAS W·Filed 2011·Application pending·0 cites
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