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US4695384A
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Method for improving the phosphorus elimination capacity of a lake
Assignee: Safege SA
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Filing: 1986-11-13
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Granted: 1987-09-22
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Expires: 2006-11-13
Abstract
Abstract A method of improving the phosphorus elimination capacity of a lake (11). Flexible wall (16) is extended from the bottom (21) of the lake a substantial distance toward the surface (23) of the lake at the beginning of the vegetation period of the lake to separate the lower parts of a minor portion of the lake from the lower parts of the rest of the lake. Sheets (18) are positioned between an inlet channel (12) and the flexible wall (16) as growth areas for algae. The flexible wall (16) is lowered around the end of the vegetation period to allow the flushing away of sedimented algae from the bottom of the minor portion of the lake.
Inventors
- 👤 Wilhelm K. Ripl
- 👤 Bo L. Verner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:57
CPC Classifications
E; E03; E03B; E03B3/00; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A method of improving the phosphorus elimination capacity of a lake (11) by restricting sedimentation of algae to a minor portion of the lake which comprises; extending a flexidle wall (16) from the bottom (21) of the lake (11) a substantial distance toward the surface (23) of the lake and between the boundaries of the lake on either side of an inlet channel (12) at the beginning of the vegetation period of the lake to separate the lower parts of a minor portion of the lake from the lower parts of the rest of the lake, positioning a number of sheets (18) between the inlet channel (12) and the flexible wall (16) as growth areas for algae, feeding phosphorus containing water to said inlet channel, and lowering the flexible wall (16) around the end of the vegetation period of the lake to allow the flushing away of sedimented algae from the bottom of said minor portion.
Claim 2
Independent Claim
156 words
A method of improving the phosphorus elimination capacity of a lake (11) by restricting sedimentation of algae to a minor portion of the lake which comprises; extending a flexidle wall (16) from the bottom (21) of the lake (11) a substantial distance toward the surface (23) of the lake and between the boundaries of the lake on either side of an inlet channel (12) at the beginning of the vegetation period of the lake to separate the lower parts of a minor portion of the lake from the lower parts of the rest of the lake, positioning a number of sheets (18) between the inlet channel (12) and the flexible wall (16) as growth areas for algae, feeding phosphorus containing water to said inlet channel, and lowering the flexible wall (16) around the end of the vegetation period of the lake to allow the flushing away of sedimented algae from the bottom of said minor portion.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |