IC 021. US 002 013 023 029 030 033 040 050. G & S: Ceramic materials for use in the oil and gas well industry, namely, ceramic pellets, shots, and spheres for use in oil well and gas well hydraulic fracturing and as gravel pack materials for sand control operation, for use as strengthening agents for subterranean formations, for use as subterranean formation filling materials, for use as proppants for subterranean formations, for use as abrasive agents for subterranean formations, and for use as fluid loss additives for subterranean formations
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