C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/50
C04B 24/12 (2006.01) C04B 24/00 (2006.01) C07F 9/6509 (2006.01) C07F 9/6558 (2006.01)
Patent
CA 1221988
ABSTRACT OF THE DISCLOSURE Certain methylene phosphonic acid derivatives of aminohydrocarbyl piperazine-urea adducts are good cement retarders.
460943
Crump Druce K.
Wilson David A.
Smart & Biggar
The Dow Chemical Company
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