Coating processes – Nonuniform coating
Reexamination Certificate
2008-01-02
2011-10-18
Cleveland, Michael (Department: 1712)
Coating processes
Nonuniform coating
C114S06700A, C114S06700A
Reexamination Certificate
active
08039055
ABSTRACT:
A method for increasing the efficiency of additive drag reduction by establishing a drag-reducing viscoelastic coating on a surface. The method includes mixing a polymer into a concentrated solution that has approximately the same density as a fluid flowing over the surface, ejecting the mixture/solution into the flowing fluid in a manner such that a coating of polymer, which initially grows thicker with time, is adsorbed onto the surface, and reducing the ejection rate of the first fluid such that the coating of polymer then grows thinner with time. These steps may be repeated so that a desired minimum coating thickness is maintained over an extended period of time. The method reduces the polymer expenditure rate for a given drag reduction. Moreover, the produced viscoelastic coating impedes the attachment and growth of drag-producing natural organisms and may be applied without “down-time” (e.g., while underway).
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Boyce Timothy A.
Moore Christopher M.
Moore Kenneth J.
Ryan Thomas D.
Arnold Bruce Y.
Arnold International
Cleveland Michael
Cortana Corporation
Mellott James
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