4. Pipe joints or couplings
  5. With casing, lining or protector
  6. Insulated

ERC Industries, Inc.

Corporate Assignee

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Corporate Assignee

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Assembly for sealing the annulus between concentric...

Wells – Above ground apparatus – Inner member anchor or seal with lateral port
Reexamination Certificate

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Back seat rising stem gate valve

Fluid handling – With leakage or drip collecting
Patent

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Connecting system for wellhead components

Pipe joints or couplings – Packed – Flanged pipe
Patent

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Full bore tubing hanger system

Wells – Above ground apparatus – Suspension means
Patent

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Gate valve

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent

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