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Walter M. Freitas
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Sao Paulo, BR
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last 30 patents
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Patent Grant
High early strength cement and additives and methods for making the...
Patent number
6,641,661
Issue date
Nov 4, 2003
W. R. Grace & Co.-Conn.
Leslie A. Jardine
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES