US3854291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning filter for hydrological regeneration
Assignee: Individual
•
Filing: 1972-12-26
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Granted: 1974-12-17
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Expires: 1992-12-26
Abstract
Abstract Apparatus for filtering and hydrologically regenerating streams comprising dams formed with filters for receiving pollutants which are passed through the filter and then into the holding basin upstream of the dam, before passing through conduits which carries the fluid through the dam. These conduits are normally open, but under conditions of unusual large quantities of fluid, as for example during heavy rains, the dam pass-through conduits close, and the water passes over the top of the dam. At certain periods when the pass-through conduits are closed and the level in the holding tank above the dam is higher than that in the filter chamber, the fluid passes up through the filter to backwash it, so that it is periodically cleaned and thus increases its efficiency and filtering ability.
Inventors
- 👤 E Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:06
CPC Classifications
E; E03; E03F; E03F5/00; E03F5/14; E02; E02B; E02B8/00; E02B8/02; E02B8/023
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
181 words
A system for purifying streams, comprising a dam installed across the river bed of the streams to form a holding pool above the dam, a filter chamber formed in the dam, an inlet sewer pipe sealed from the holding pool connected to the dam to supply input fluid to said filter chamber, filter outlet means extending from the bottom of said filter chamber into said holding pool to normally supply filtered fluid into said holding pool, including pass-through conduit means extending from said holding pool to downstream of said dam and positioned so that the normal head in said holding pool is less than in said filter chamber, including valve means connected to said pass-through conduit means and normally open and adapted to close when the level of said holding pool rises above a preset level, and including a spill way formed in the dam and the elevation of the spill way above the head in said filter such that the filter is backwashed and cleaned by fluid passing from said holding pool through said filter outlet means to said filter.
Claim 2
Independent Claim
181 words
A system for purifying streams, comprising a dam installed across the river bed of the streams to form a holding pool above the dam, a filter chamber formed in the dam, an inlet sewer pipe sealed from the holding pool connected to the dam to supply input fluid to said filter chamber, filter outlet means extending from the bottom of said filter chamber into said holding pool to normally supply filtered fluid into said holding pool, including pass-through conduit means extending from said holding pool to downstream of said dam and positioned so that the normal head in said holding pool is less than in said filter chamber, including valve means connected to said pass-through conduit means and normally open and adapted to close when the level of said holding pool rises above a preset level, and including a spill way formed in the dam and the elevation of the spill way above the head in said filter such that the filter is backwashed and cleaned by fluid passing from said holding pool through said filter outlet means to said filter.
Claim 3
Dependent Claim
33 words
A system according to claim 1 comprising an outlet sewer pipe connected to said filter chamber to establish the normal fluid level in said filter chamber above the level in said holding pool.
Claim 4
Dependent Claim
19 words
A system according to claim 2 wherein said inlet and outlet sewer pipes are connected to underground sewer systems.
Claim 5
Dependent Claim
44 words
A system according to claim 3 including a second dam downstream and formed with a filter chamber and the inlet sewer pipe for said second dam connected to the underground sewer system which is connected to the outlet sewer pipe of the upstream dam.
Claim 6
Dependent Claim
13 words
A system according to claim 1 wherein said valve means are pressure responsive.
Claim 7
Dependent Claim
15 words
A system according to claim 1 wherein said valve means comprise float controlled valve means.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |