Wo Oi Cheng

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Kowloon, HK

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Patents Grantslast 30 patents

Information Patent Grant
Power transformers and methods of manufacturing transformers and wi...
- Patent number 11,075,032
- Issue date Jul 27, 2021
- Astec International Limited
- Wo Oi Cheng
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Low cost charger transformer
- Patent number 8,198,969
- Issue date Jun 12, 2012
- Astec International Limited
- Wo Oi Cheng
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC

Patents Applicationslast 30 patents

Information Patent Application
POWER TRANSFORMERS AND METHODS OF MANUFACTURING TRANSFORMERS AND WI...
- Publication number 20210383970
- Publication date Dec 9, 2021
- Astec International Limited
- Wo Oi Cheng
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
POWER TRANSFORMERS AND METHODS OF MANUFACTURING TRANSFORMERS AND WI...
- Publication number 20180374637
- Publication date Dec 27, 2018
- Astec International Limited
- Wo Oi CHENG
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
POWER TRANSFORMERS AND METHODS OF MANUFACTURING TRANSFORMERS AND WI...
- Publication number 20160225514
- Publication date Aug 4, 2016
- Astec International Limited
- Wo Oi CHENG
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Low Cost Charger Transformer
- Publication number 20110074532
- Publication date Mar 31, 2011
- Astec International Limited
- Wo Oi Cheng
- H01 - BASIC ELECTRIC ELEMENTS