Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Reexamination Certificate
2005-11-04
2008-11-11
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
Reexamination Certificate
active
07448455
ABSTRACT:
A turbodrill has rotor vanes and stator vanes that are asymmetric with respect to each other. The rotor blade on which the rotor vanes are disposed has a reaction of less than about 0.5. A method of designing a turbodrill comprises optimizing a first design of stator vanes and optimizing a second design of rotor vanes using computational fluid analysis.
REFERENCES:
patent: 3583502 (1971-06-01), Henderson
patent: 4676716 (1987-06-01), Brudny-Chelyadinov et al.
patent: 0671563 (1995-09-01), None
Combined Search and Examination Report issued in corresponding British Application No. GB0618338.8; Dated Jan. 11, 2007; 6 pages.
Beaton Timothy P.
Beylotte James
Natanael Mark
Nevlud Kenneth M.
Dang Hoang
Osha • Liang LLP
Smith International Inc.
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