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US 4,204,967 AGranted
Tubewell screen filters
OwnerAlan S. Bannisterinventor
Life of this patent
Estimating the term…
Abstract
A tubewell screen filter includes a core tube with apertures distributed along its length and a support structure which provides distributed support for a fine mesh filter screen with an open area of at least 12%. The support structure has helical channels which conduct water and sediment from the fine mesh filter screen to the apertures in the core tube. The filter may be of any desired length.
Claims14
A tubewell screen filter comprising
- means defining a passage for filtered water having apertures to allow filtered water to enter the passage, and
- a filter assembly mounted on and surrounding the passage-defining means, said assembly comprising
- support means defining channels leading to the apertures, said support means including
- a coarse mesh material contiguous with and supported by another part of the support means, and the assembly further comprising
- a fine mesh screen means contiguous with the coarse mesh material and having an open area of at least 12% of its overall area.
2 more elements
A tubewell screen filter comprising
- a core tube having openings to allow water to pass into the interior of the tube,
- a cylindrical screen arranged around the core tube and having an open area of at least 12% of its overall area, and
- a support structure pervious to water supporting the screen on the core tube and defining helical channels at least on the face directed towards the tube, the support structure providing distributed support for the screen to enable strata loads directly exerted on the screen to be transmitted to the core tube without substantial distortion of the screen.
A tubewell screen filter comprising
- a filter screen,
- an apertured core tube, and
- support structure mounted on the core tube and carrying the filter screen so as to provide distributed support therefor,
- helical channels being provided for delivering to the apertures of the core tube material which has passed through the filter screen, said channels lying between the inner face of the filter screen and the inner surface of the core tube.
1 more element
Dependencies are inferred from the claim text.