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Electrohydraulic damper for elevator system
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Patent number 11,203,510
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Issue date Dec 21, 2021
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Otis Elevator Company
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Tadeusz Pawel Witczak
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Conveyance system data transfer
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Patent number 11,153,004
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Issue date Oct 19, 2021
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Otis Elevator Company
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Stella M. Oggianu
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Universal electromagnetic machine
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Patent number 11,146,140
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Issue date Oct 12, 2021
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Carrier Corporation
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Tadeusz Pawel Witczak
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Conveyance system data transfer
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Patent number 11,076,338
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Issue date Jul 27, 2021
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Otis Elevator Company
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Tadeusz Pawel Witczak
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Modular transfer station
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Patent number 10,981,752
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Issue date Apr 20, 2021
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Otis Elevator Company
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Tadeusz Pawel Witczak
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B66 - HOISTING LIFTING HAULING
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Electromagnetic machine
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Patent number 10,958,123
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Issue date Mar 23, 2021
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Carrier Corporation
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Tadeusz Pawel Witczak
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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