U.S. federal trademark · Serial No. 74696794 · Reg. No. 1978399
industrial chemicals for the oil and gas drilling industry, namely lignosulfonate additives for drilling fluids, powder deflocculants, asphalt additives for sealing and fluid loss control, thinning and inhibition agents for drilling fluids, viscosity agents for drilling fluids and sealants for drilling fluids; and industrial chemicals used as cement retarders
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