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Home › Drilling mud additive comprising ferrous sulfate and poly(N-vinyl-2-pyrrolidone/sodium 2-acrylamido-2-methylpropane sulfonate)

Drilling mud additive comprising ferrous sulfate and poly(N-vinyl-2-pyrrolidone/sodium 2-acrylamido-2-methylpropane sulfonate)

US Patent 5204320 · Granted Apr 20, 1993

Estimated economic value: $9,186,000 ⓘ

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