Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Reexamination Certificate
2007-10-02
2007-10-02
Thompson, Kenneth (Department: 3672)
Boring or penetrating the earth
With above-ground means for handling drilling fluid or cutting
Fluid or cuttings directing or receiving means engaging bore...
C175S218000, C175S312000, C166S229000, C166S075120, C137S547000, C137S625320, C137S625470, C210S422000, C210S446000, C210S459000
Reexamination Certificate
active
11799846
ABSTRACT:
The invention contemplates a strainer based upon a four-way, two-position rotary cylindrical plug valve having a hollow plug. The normal entry port for the sealing plug of the plug valve is a circular radial hole passing from the exterior of the plug into the interior cavity of the plug. The normal exit port for the sealing plug is a regular array of small holes across from and coaxial with the normal entry hole. The ports for the valve body are in two pairs positioned at 90° from each other, with the axes of the ports lying in the same transverse plane as the ports of the valve plug.
REFERENCES:
patent: 1646514 (1927-10-01), Winton
patent: 3348694 (1967-10-01), Smith
McCaskill John Walton
Schmidt David Anthony
Schmidt Robert Frank
Sims Donald Glynn
Sims Michael James
Bomar Shane
Expro Americas, L.P.
Hall Elizabeth R.
Thompson Kenneth
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