85606055
Apr 24, 2012
Feb 18, 2014
Tracers for tracing subterranean formations; and materials capable of indicating changes of proppant placements dynamically over time
Electrical and Scientific ApparatusCeramic materials for use in the oil well and gas well industry, namely, ceramic pellets, shots, and spheres for use in oil well and gas well hydraulic fracturing and as a gravel pack material for sand control operation, and for use as strengthening agents for subterranean formations
Housewares and Glass