Underground water pumping device

Wells – With below and above ground modification – Eduction pump or plunger in well

Reexamination Certificate

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Details

C166S242800, C166S236000, C166S370000

Reexamination Certificate

active

07036577

ABSTRACT:
A groundwater pumping apparatus includes an outer tube, an inner tube, a shield member, a vacuum unit and a pump unit. The outer tube is buried in ground, and has a water-passing portion at its lower part. The inner tube has a substantially same length as the outer tube, and is placed in the outer tube such that the inner tube is spaced from the outer tube. The inner tube has a groundwater inlet at its bottom end, which is provided at a position lower than a top end of the water-passing portion. The shield member shields top ends of the outer tube and the inner tube. The vacuum unit reduces a pressure in the inner tube. The pump unit pumps groundwater that comes in the inner tube through the groundwater inlet.

REFERENCES:
patent: 2833222 (1958-05-01), Hansen
patent: RE33102 (1989-10-01), Visser et al.
patent: 5271467 (1993-12-01), Lynch
patent: 6305473 (2001-10-01), Peramaki
patent: 775535 (1997-05-01), None
patent: 125539/1986 (1986-08-01), None
patent: 5-156624 (1993-06-01), None
patent: 7-197441 (1995-08-01), None
patent: 07284753 (1995-10-01), None
patent: 8-13463 (1996-01-01), None
patent: 9-279974 (1997-10-01), None
patent: 2000-27170 (2000-01-01), None
patent: WO 9508043 (1995-03-01), None
patent: WO 9820232 (1998-05-01), None

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