4. Mining or in situ disintegration of hard material
  5. In situ conversion of solid to fluid
  6. Melted material recovered

Roy Anthony Pickren

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Sulfur storage method

Mining or in situ disintegration of hard material – In situ conversion of solid to fluid – Melted material recovered
Reexamination Certificate

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Sulfur storage system

Hydraulic and earth engineering – Fluid control – treatment – or containment – Fluid storage in earthen cavity
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