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Shanghai, CN
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Patents Grants
last 30 patents
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Patent Grant
Frequency converter, bypass frequency conversion control system and...
Patent number
10,601,356
Issue date
Mar 24, 2020
Otis Elevator Company
Kun Ma
B66 - HOISTING LIFTING HAULING
Patents Applications
last 30 patents
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Patent Application
SAFETY CHAIN DEVICE AND SAFETY PROTECTION SYSTEM FOR ESCALATOR
Publication number
20230312306
Publication date
Oct 5, 2023
Otis Elevator Company
Kun Ma
B66 - HOISTING LIFTING HAULING
Information
Patent Application
FREQUENCY CONVERTER, BYPASS FREQUENCY CONVERSION CONTROL SYSTEM AND...
Publication number
20190089284
Publication date
Mar 21, 2019
Otis Elevator Company
Kun Ma
B66 - HOISTING LIFTING HAULING