4. Hydraulic and earth engineering
  5. Fluid control, treatment, or containment
  6. Flow control

Derek Humphries

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Channel installation device

Hydraulic and earth engineering – Bank – shore – or bed protection – Wave or flow dissipation
Reexamination Certificate

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Drainage channel installation device

Plastic and nonmetallic article shaping or treating: processes – Forming structural installations in situ – Uniting preform member with molding material
Reexamination Certificate

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Drainage grate

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Reexamination Certificate

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Drainage grate assembly

Road structure – process – or apparatus – Drain or gutter
Reexamination Certificate

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Method and apparatus for forming a trench drain

Hydraulic and earth engineering – Fluid control – treatment – or containment – Flow control
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2588461

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