4. Electric resistance heating devices
  5. Heating devices
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Method of stumulating oil wells by pumped solvent heated in situ

Electric resistance heating devices – Heating devices – Borehole type
Patent

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Optimum oil-well casing heating

Electric resistance heating devices – Heating devices – Borehole type
Reexamination Certificate

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Robust electrical heating systems for mineral wells

Electric resistance heating devices – Heating devices – Borehole type
Patent

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Selective excitation of heating electrodes for oil wells

Electric resistance heating devices – Heating devices – Borehole type
Patent

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Steam generation system for injecting steam into oil wells

Electric resistance heating devices – Heating devices – Borehole type
Reexamination Certificate

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Subsurface connection methods for subsurface heaters

Electric resistance heating devices – Heating devices – Borehole type
Reexamination Certificate

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Varying properties along lengths of temperature limited heaters

Electric resistance heating devices – Heating devices – Borehole type
Reexamination Certificate

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