U.S. federal trademark · Serial No. 73212271 · Reg. No. 1184304
a Substantially Water Insoluble Inorganic Chemical Material in Dry, Granular Form for Admixture with Water or Brine to Form a Weighted Suspension Useful as a Petroleum Well Workover Fluid, Petroleum Well Bridging Agent, and as a Fluid in Drilling or Maintenance of Petroleum Wells
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