Description: Class 6: [ Equipment used in drilling, completion, production and working of oil and gas wells, namely, (1) bridge plugs composed primarily of steel or cast iron, for controlling pressure or fluids downhole, (2) frac plugs composed primarily of steel, cast iron, or aluminum, for controlling pressure or fluids downhole, and (3) cement retainers composed primarily of steel or cast iron, for controlling pressure, cement or fluids downhole ]
Class 7: [ Equipment and machines used in drilling, completion, production and working of oil and gas wells, namely, (1) power pipe recovery equipment in the nature of shock subs, severing tools, jet cutters, mechanical cutters, reactive cutters, tubing cutters, casing cutters, (2) power setting equipment in the nature of setting tools, setting sleeves, adapter rods, lock springs, shear studs, shear rings, and (3) power setting tools in the nature of wireline set setting tools and components therefor, hydraulic-mechanical setting tools and components therefor, hydraulic setting tools and components therefor ]
Class 13: Explosives and detonators used in drilling, completion, production and working of oil and gas wells, namely, [ power charges, ] power charge ignitors, [ and bi-directional boosters, ] and detonators
Class 20: [ Equipment used in drilling, completion, production and working of oil and gas wells, namely, (1) bridge plugs composed primarily of epoxy based composites, synthetic rubber or plastic, for controlling pressure or fluids downhole, (2) frac plugs composed primarily of epoxy based composites, synthetic rubber or plastic, for controlling pressure or fluids downhole, and (3) cement retainers composed primarily of epoxy based composites, synthetic rubber or plastic, for controlling pressure, cement or fluids downhole ]
