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Cheng-Feng Chang
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Kaohsiung Hsien, TW
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Patents Grants
last 30 patents
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Patent Grant
Method for producing a ready-mix soil material
Patent number
7,069,677
Issue date
Jul 4, 2006
Cheng-Feng Chang
B28 - WORKING CEMENT, CLAY, OR STONE
Patents Applications
last 30 patents
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Patent Application
Method for producing a ready-mix soil material
Publication number
20050077058
Publication date
Apr 14, 2005
Cheng-Feng Chang
B28 - WORKING CEMENT, CLAY, OR STONE