Inventor · disambiguated record
Masao Iwasa
Also filed as: IWASA MASAO
10 granted patents·364 citations·filing 1987–2000
91Inventor score
Files withOTIS ELEVATOR CO10
Top patents by PatentIndex Score
10 records- 0197US5070290AAlternating current motor control system with emergency control responsive to failure of power supplyOTIS ELEVATOR CO·Filed 1988·Granted Dec 3, 1991·127 cites·20 claims
- 0290US5058710AElevator power source deviceOTIS ELEVATOR CO·Filed 1990·Granted Oct 22, 1991·84 cites·3 claims
- 0383US5533595ATraction-type elevatorOTIS ELEVATOR CO·Filed 1994·Granted Jul 9, 1996·37 cites·6 claims
- 0478US5247140ABrake control system in elevator control apparatusOTIS ELEVATOR CO·Filed 1991·Granted Sep 21, 1993·36 cites·3 claims
- 0563US6481533B1Single inverter controller for elevator hoist and door motorsOTIS ELEVATOR CO·Filed 2000·Granted Nov 19, 2002·12 cites·4 claims
- 0661US5564530ATraction type elevatorOTIS ELEVATOR CO·Filed 1994·Granted Oct 15, 1996·20 cites·4 claims
- 0752US4870334AMotor control apparatusOTIS ELEVATOR CO·Filed 1987·Granted Sep 26, 1989·12 cites·8 claims
- 0847US4994951APWM inverter control unitOTIS ELEVATOR CO·Filed 1989·Granted Feb 19, 1991·12 cites·2 claims
- 0943US5105352AOffset correction circuit of pwm inverterOTIS ELEVATOR CO·Filed 1990·Granted Apr 14, 1992·15 cites·7 claims
- 1038US5070426AClipper circuit for power transistor circuit and inverter circuit utilizing the sameOTIS ELEVATOR CO·Filed 1990·Granted Dec 3, 1991·9 cites·16 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →