4. Chemistry of inorganic compounds
  5. Modifying or removing component of normally gaseous mixture
  6. Mixture is exhaust from internal-combustion engine

B. Franklin Beard

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Methods and apparatus for heating oil production reservoirs

Wells – Processes – Distinct – separate injection and producing wells
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Methods and apparatus for increasing and extending oil...

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Reexamination Certificate

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Methods and apparatus for increasing and extending oil...

Liquid purification or separation – Filter – With pump – gas pressure – or suction source
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