Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Reexamination Certificate
2003-10-30
2011-11-22
Neuder, William P (Department: 3676)
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
C415S123000, C188S290000
Reexamination Certificate
active
08061448
ABSTRACT:
The hydraulic braking device (10) to be installed in a turbine (2) provided with a turbine shaft (4) comprising at least one body (12) connected to the said turbine shaft (4).When the said hydraulic braking device (10) is immersed in a fluid medium, axial rotation of the turbine shaft (4) about its axis causes a movement of the said at least one body (12) with respect to the said fluid medium, this movement generating a resisting torque (T) related to the rotation speed of the turbine shaft (4) through a non-linear relation.
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Patent abstracts of Japan, Jun. 4, 2002, TCM Corp.
Hocquet Philippe
Nguyen Huy-Van
Parry Andrew
Du Jianguang
Fuller Robert E
Neuder William P
Schlumberger Technology Corporation
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