Pumps – Drilled well free piston-type pump
Reexamination Certificate
2005-12-06
2005-12-06
Solak, Timothy P. (Department: 3746)
Pumps
Drilled well free piston-type pump
C417S060000, C417S555200, C166S372000
Reexamination Certificate
active
06971856
ABSTRACT:
A plunger for well casings and tubulars comprising: an upper valve rod segment slideably positioned within the plunger body; a valve rod tube slideably positioned in the lower end of the plunger body; a lower valve rod segment slideably positioned in the valve rod tube; a spring positioned between the upper and lower valve rod segments; and a valve element on the upper valve rod segment for closing the plunger flow passage when the upper valve rod segment moves to a closing position. The plunger preferably also comprises an exterior flexible sealing member and a sealing member actuator operated by the valve rod tube. A shield is also preferably provided in the plunger body to prevent premature closure of the valve element.
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Mayfield Windel O.
Moore Robert L.
Brown Dennis D.
Fellers Snider Blankenship Bailey & Tippens, P.C.
PAAL, L.L.C.
Solak Timothy P.
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