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Haiyin Ma
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Guangdong, CN
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Patents Grants
last 30 patents
Information
Patent Grant
Method for implementing wide area Centrex
Patent number
7,609,831
Issue date
Oct 27, 2009
Huawei Technologies Co., Ltd.
Haiyin Ma
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method for a calling party to reinitiate a call in card number service
Patent number
7,596,212
Issue date
Sep 29, 2009
Huawei Technologies Co., Ltd.
Haiyin Ma
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
Method for Implementing Wide Area Centrex
Publication number
20070286390
Publication date
Dec 13, 2007
Haiyin Ma
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Method for a calling party to reinitiate a call in card number service
Publication number
20070165828
Publication date
Jul 19, 2007
Haiyin Ma
H04 - ELECTRIC COMMUNICATION TECHNIQUE