Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Reexamination Certificate
2007-04-17
2007-04-17
Bagnell, David (Department: 3672)
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
C416S24100B, C416S24100B, C415S903000, C415S200000, C415S199400, C415S901000
Reexamination Certificate
active
10639826
ABSTRACT:
A turbine is disclosed which includes a turbine blade housing having an inner facing portion of a first material having a first coefficient of expansion, and a turbine blade body having an outer facing portion of a second coefficient of expansion greater than said first coefficient. In a preferred embodiment, the blade housing comprises a number of steel shroud rings and the turbine blade body comprises a number of stators and rotors of a thermoplastic material. An interference fit between stator blades and the shroud rings is enhanced in use due to the difference in thermal and/or hydrophilic coefficients of expansion of the first and second materials.
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Downie Andrew McPherson
Pezzani Guido Ernesto
Scott Edward Docherty
Alston & Bird LLP
Bagnell David
Smith Matthew J.
Smith International Inc.
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