Tag: Critical Minerals
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The patent record shows a hidden federal bet: instead of opening new mines, the US is engineering rare-earth supply out of coal ash, acid mine drainage, and other industrial waste.
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Schlumberger and Halliburton just spent 2025 patenting downhole NMR and pulsed-neutron tools tuned for lithium-7. The DLE race is being won by oilfield services contractors, not chemistry startups.