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Methods, well cement compositions and lightweight additives therefor

  • US 6,660,078 B2
  • Filed: 11/20/2002
  • Issued: 12/09/2003
  • Est. Priority Date: 12/03/2001
  • Status: Expired due to Term
First Claim
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1. A cement composition additive comprising a suspension of fly ash microspheres in a water solution of sodium bentonite.

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