Inventor · disambiguated record
Ryoichi Takahata
Also filed as: TAKAHATA RYOICHI
23 granted patents·6 pending applications·388 citations·filing 1990–2013
96Inventor score
Files withKOYO SEIKO CO11HITACHI LTD6IWAJI YOSHITAKA5HITACHI IND EQUIPMENT SYS2HITACHI AUTOMOTIVE SYSTEMS LTD1
Top patents by PatentIndex Score
29 records- 0195US7915776B2Permanent magnet type electric rotary machine and compressor using the sameHITACHI IND EQUIPMENT SYS·Filed 2010·Granted Mar 29, 2011·20 cites·14 claims
- 0295US7768172B2Permanent magnet type electric rotary machine and compressor using the sameHITACHI IND EQUIPMENT SYS·Filed 2007·Granted Aug 3, 2010·35 cites·16 claims
- 0387US8884575B2Drive system for synchronous electrical motorHITACHI AUTOMOTIVE SYSTEMS LTD·Filed 2013·Granted Nov 11, 2014·7 cites·20 claims
- 0478US5314868ABearing deviceKOYO SEIKO CO·Filed 1992·Granted May 24, 1994·43 cites·15 claims
- 0577US5763971ASuperconducting bearing deviceKOYO SEIKO CO·Filed 1995·Granted Jun 9, 1998·35 cites·9 claims
- 0676US6541880B2Linear motorHITACHI LTD·Filed 2001·Granted Apr 1, 2003·21 cites·6 claims
- 0775US6552461B2Permanent magnet type rotating electric machineHITACHI LTD·Filed 2002·Granted Apr 22, 2003·18 cites·8 claims
- 0875US5330967ASuperconducting bearing device stabilized by trapped fluxKOYO SEIKO CO·Filed 1991·Granted Jul 19, 1994·38 cites·7 claims
- 0973US9325264B2Electric motor drive deviceIWAJI YOSHITAKA·Filed 2012·Granted Apr 26, 2016·3 cites·15 claims
- 1073US6838798B2Permanent magnet type rotating electric machineHITACHI LTD·Filed 2003·Granted Jan 4, 2005·16 cites·6 claims
- 1172US8766575B2Synchronous electric motor drive systemIWAJI YOSHITAKA·Filed 2011·Granted Jul 1, 2014·3 cites·10 claims
- 1271US7057327B2Vehicular alternatorHITACHI LTD·Filed 2001·Granted Jun 6, 2006·17 cites·9 claims
- 1370US5739606ASuperconducting bearing deviceKOYO SEIKO CO·Filed 1996·Granted Apr 14, 1998·27 cites·6 claims
- 1466US8878480B2Synchronous motor drive system and synchronous motorIWAJI YOSHITAKA·Filed 2012·Granted Nov 4, 2014·2 cites·6 claims
- 1566US6759776B2Permanent magnet type electric rotating machineHITACHI LTD·Filed 2002·Granted Jul 6, 2004·12 cites·8 claims
- 1662US6759777B2Permanent magnet type electric rotating machineHITACHI LTD·Filed 2002·Granted Jul 6, 2004·9 cites·32 claims
- 1753US5446018ASuperconducting bearing deviceKOYO SEIKO CO·Filed 1992·Granted Aug 29, 1995·17 cites·9 claims
- 1853US5438038ASuperconducting bearing device stabilized by trapped fluxKOYO SEIKO CO·Filed 1993·Granted Aug 1, 1995·14 cites·10 claims
- 1949US5801469ASuperconducting bearing deviceKOYO SEIKO CO·Filed 1992·Granted Sep 1, 1998·14 cites·3 claims
- 2049US5633548AMethod for setting up a superconducting bearing deviceKOYO SEIKO CO·Filed 1995·Granted May 27, 1997·13 cites·21 claims
- 2145US5736802AMagnetic bearing deviceKOYO SEIKO CO·Filed 1997·Granted Apr 7, 1998·10 cites·9 claims
- 2241US2002055695A1Motor-driven beauty deviceFiled 2001·Application pending·0 cites
- 2339US5254528ABrake device including magnet and superconductorKOYO SEIKO CO·Filed 1991·Granted Oct 19, 1993·9 cites·15 claims
- 2439US2015069941A1Three-Phase Synchronous Motor Drive DeviceIWAJI YOSHITAKA·Filed 2012·Application pending·0 cites
- 2537US2002175583A1Permanent magnet type rotating electrical machine and air conditioner using itFiled 2001·Application pending·0 cites
- 2637US2014077738A1Driving System For Synchronous MotorIWAJI YOSHITAKA·Filed 2011·Application pending·0 cites
- 2737US2002175584A1Permanent magnet type rotating electrical machineFiled 2001·Application pending·0 cites
- 2836US2002171309A1Rotor and rotating electrical machine with embedded permanent magnetFiled 2001·Application pending·0 cites
- 2935US5111140AApparatus and method for measuring repulsive displacement and repulsive force characteristics of a superconductor with respect to a magnetKOYO SEIKO CO·Filed 1990·Granted May 5, 1992·5 cites·16 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →