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Drilling fluid

  • US 2,826,548 A
  • Filed: 06/18/1956
  • Issued: 03/11/1958
  • Est. Priority Date: 06/18/1956
  • Status: Expired due to Term
First Claim
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1. A WATER-BASE DRILLING MUD WHICH COMPRISES A MAJOR AMOUNT OF AN AQUEOUS SUSPENSION OF FINELY DIVIDED SOLID INORGANIC MATERIALS AND A COPOLYMER OF ISOBUTYLENE AND MALEIC ANHYDRIDE HAVING A MOLECULAR WEIGHT IN EXCESS OF 10,000 AND CONTAINING ADMIXED THEREWITH FROM ABOUT 1% TO ABOUT 10% BY WEIGHT OF A GLYCOL HAVING THE FORMULA

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