US4538683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple point groundwater sampler
Assignee: Babcock and Wilcox Co
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Filing: 1984-03-19
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Granted: 1985-09-03
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Expires: 2004-03-19
Abstract
Abstract A multiple point groundwater sampler in which a rotatable inner cylinder has perforations which selectively align with the perforations of an outer cylinder to provide for sampling at individual horizons within a well casing, and means to withdraw the sample from the inner cylinder.
Inventors
- 👤 Eugene T. Chulick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:41
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/084; E21B33/00; E21B33/10; E21B33/12; E21B33/124
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
135 words
A device for sampling groundwater at individual horizons independently within a multiple screened monitoring well comprising: an inner cylinder having a first plurality of screened perforations; an outer cylinder concentrically arranged about and contiguous with said inner cylinder, and having a second plurality of screened perforations; the perforations in one of the said plurality of screened perforation being circumferentially offset; means for rotating the inner cylinder about its longitudinal axis to sequentially align selective first and second screened perforations thereby establishing communication with each individual horizon to allow the flow of groundwater through said first and second screened perforations into the inner cylinder; pumping means in communication with the inner cylinder is removing each groundwater sample from the inner cylinder; and packing means for isolating each individual horizon from other horizons within the monitoring well.
Claim 2
Independent Claim
135 words
A device for sampling groundwater at individual horizons independently within a multiple screened monitoring well comprising: an inner cylinder having a first plurality of screened perforations; an outer cylinder concentrically arranged about and contiguous with said inner cylinder, and having a second plurality of screened perforations; the perforations in one of the said plurality of screened perforation being circumferentially offset; means for rotating the inner cylinder about its longitudinal axis to sequentially align selective first and second screened perforations thereby establishing communication with each individual horizon to allow the flow of groundwater through said first and second screened perforations into the inner cylinder; pumping means in communication with the inner cylinder is removing each groundwater sample from the inner cylinder; and packing means for isolating each individual horizon from other horizons within the monitoring well.
Claim 3
Dependent Claim
25 words
A device as in claim 1 wherein the packing means comprises inflatable annuli which substantially eliminate cross-contamination between the individual horizons within the monitoring well.
Claim 4
Independent Claim
132 words
A method of sequentially sampling groundwater at individual horizons independently within a multiple screened monitoring well comprising the steps of: positioning a sampling device within the well bore, said sampling device having an inner cylinder and an outer cylinder with, respectively, a first and second plurality of screened perforations thereon; the perforations in one of the said plurality of screened perforations, being circumferentially offset; inflating annuli at intervals corresponding to and defining the individual horizons to be monitored; rotating the inner cylinder of the sampling device about its longitudinal axis to sequentially align selective first and second screened perforations thereby establishing communication with each individual horizon to allow the flow of groundwater through said first and second screened perforations into the inner cylinder; and pumping each groundwater sample from the inner cylinder.
Claim 5
Independent Claim
132 words
A method of sequentially sampling groundwater at individual horizons independently within a multiple screened monitoring well comprising the steps of: positioning a sampling device within the well bore, said sampling device having an inner cylinder and an outer cylinder with, respectively, a first and second plurality of screened perforations thereon; the perforations in one of the said plurality of screened perforations, being circumferentially offset; inflating annuli at intervals corresponding to and defining the individual horizons to be monitored; rotating the inner cylinder of the sampling device about its longitudinal axis to sequentially align selective first and second screened perforations thereby establishing communication with each individual horizon to allow the flow of groundwater through said first and second screened perforations into the inner cylinder; and pumping each groundwater sample from the inner cylinder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |