4. Earth boring, well treating, and oil field chemistry
  5. Earth boring
  6. Contains organic component

Gernold Botthof

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Compositions containing copolymers based on acryloyldimethyl...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate

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Copolymers and their use as drilling aids

Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2432217

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