4. Pipes and tubular conduits
  5. Distinct layers
  6. With intermediate insulation layer

L. S. Gruber

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Advancing heated annulus steam drive

Wells – Processes – With indicating – testing – measuring or locating
Patent

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Concentric insulated tubing string

Metal working – Method of mechanical manufacture – During simulated operation or operating conditions
Patent

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Concentric insulated tubing string

Pipe joints or couplings – With casing – lining or protector – Insulated
Patent

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Concentric tubing having bonded insulation within the annulus

Pipes and tubular conduits – Distinct layers – With intermediate insulation layer
Patent

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Engine intake valve with heat pipe

Internal-combustion engines – Cooling – Internal cooling of moving parts; e.g. – hollow valves,...
Patent

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