Inventor · disambiguated record
Sadao Hokari
Also filed as: HOKARI SADAO
16 granted patents·356 citations·filing 1975–2001
95Inventor score
Files withHITACHI LTD16
Top patents by PatentIndex Score
16 records- 0184US6408986B1Charger for elevator call devicesHITACHI LTD·Filed 2001·Granted Jun 25, 2002·25 cites·17 claims
- 0284US4378059AAbnormal elevator speed detectorHITACHI LTD·Filed 1981·Granted Mar 29, 1983·33 cites·8 claims
- 0380US5389749AElevator systemHITACHI LTD·Filed 1992·Granted Feb 14, 1995·51 cites·11 claims
- 0479US4319665AAC Elevator control systemHITACHI LTD·Filed 1980·Granted Mar 16, 1982·28 cites·14 claims
- 0576US4780660AApparatus for compensating reactive power by current-source type converterHITACHI LTD·Filed 1987·Granted Oct 25, 1988·36 cites·4 claims
- 0672US4387436AMethod and apparatus for detecting elevator car positionHITACHI LTD·Filed 1980·Granted Jun 7, 1983·23 cites·8 claims
- 0771US4787021ACurrent-type converter apparatusHITACHI LTD·Filed 1988·Granted Nov 22, 1988·26 cites·17 claims
- 0866US6481531B1Elevator communications apparatusHITACHI LTD·Filed 2001·Granted Nov 19, 2002·13 cites·13 claims
- 0966US4553640AController for elevatorHITACHI LTD·Filed 1982·Granted Nov 19, 1985·17 cites·18 claims
- 1062US4101819AThree phase controlling systemHITACHI LTD·Filed 1975·Granted Jul 18, 1978·13 cites·5 claims
- 1161US4924373AApparatus and method for controlling switching elements in a PWN-controlled voltage source inverterHITACHI LTD·Filed 1989·Granted May 8, 1990·19 cites·16 claims
- 1261US4829416AApparatus for controlling power transducers of the pulse width modulation (PWM) control typeHITACHI LTD·Filed 1987·Granted May 9, 1989·21 cites·11 claims
- 1359US5155671APower converter with current-type inverterHITACHI LTD·Filed 1990·Granted Oct 13, 1992·27 cites·21 claims
- 1459US4039866AThyristor control apparatusHITACHI LTD·Filed 1976·Granted Aug 2, 1977·8 cites·7 claims
- 1555US6492790B2Driving system for driving AC motorHITACHI LTD·Filed 2001·Granted Dec 10, 2002·10 cites·9 claims
- 1633US4661757AController for AC elevatorHITACHI LTD·Filed 1984·Granted Apr 28, 1987·6 cites·11 claims
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