4. Chemistry: natural resins or derivatives; peptides or proteins;
  5. Lignins or derivatives
  6. Heavy metal, aluminum, silicon or phosphorus containing

Roy F. House

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Anhydride-modified chitosan, method of preparation thereof,...

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

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Anhydride-modified chitosan, method of preparation thereof,...

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

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Aphron-containing well drilling and servicing fluids of enhanced

Boring or penetrating the earth – Processes – Boring with specific fluid
Patent

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Aphron-containing well drilling and servicing fluids of...

Boring or penetrating the earth – Processes – Boring with specific fluid
Reexamination Certificate

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Chitosan-containing well drilling and servicing fluids

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

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