US3563385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sand filter for water purification
Assignee: Individual
•
Filing: 1969-04-23
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Granted: 1971-02-16
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Expires: 1989-04-23
Abstract
Abstract A sand filter for water purification comprises external channels for feeding water to be purified to the outer of two spaced, vertical walls which are water permeable along their entire height. The sand charge is between the walls. A water collecting chamber is provided within the inner wall and it communicates with a water collecting manifold arranged in the lower part of the filter. Self-cleaning grates are installed in the path of water flow from the openings in the outer wall to the s and charge between the walls.
Inventors
- 👤 Sergei Ivanovich Bykov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:55
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/46; B01D24/4668; B01D24/4689; B01D24/02; B01D24/04; B01D24/06; B01D24/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A sand filter for water purification, said filter comprising first and second spaced vertical walls with a sand charge therebetween, said walls having openings for being water permeable throughout their height, duct means on said first wall on the side thereof remote from the sand charge for supplying water to said first wall for passage through the openings therein to the sand charge, grates adjoining the openings in the first wall and having slots spaced vertically and tapering in narrowing direction towards said sand charge for the passage of water to the sand charge, a collecting chamber for filtered water on the side of the second wall remote from said sand charge, and a water collecting manifold at the bottom of said collecting chamber.
Claim 2
Dependent Claim
124 words
A sand filter for water purification, said filter comprising first and second spaced vertical walls with a sand charge therebetween, said walls having openings for being water permeable throughout their height, duct means on said first wall on the side thereof remote from the sand charge for supplying water to said first wall for passage through the openings therein to the sand charge, grates adjoining the openings in the first wall and having slots spaced vertically and tapering in narrowing direction towards said sand charge for the passage of water to the sand charge, a collecting chamber for filtered water on the side of the second wall remote from said sand charge, and a water collecting manifold at the bottom of said collecting chamber.
Claim 3
Dependent Claim
32 words
A filter as claimed in claim 1 wherein said duct means comprises vertical ducts in the form of chutes tightly fitted on the first wall and in communication with the openings therein.
Claim 4
Dependent Claim
17 words
A filter as claimed in claim 1 wherein said grates are inclined upwardly towards said first wall.
Claim 5
Dependent Claim
12 words
A filter as claimed in claim 1 wherein said walls are annular.
Claim 6
Dependent Claim
38 words
A filter as claimed in claim 4 comprising a funnel-shaped bottom portion with solid walls adjoining the first and second walls for collecting the sand charge, said bottom portion having a lower opening for discharge of sand charge.
Claim 7
Dependent Claim
38 words
A filter as claimed in claim 5 wherein said manifold is annular and surrounds said funnel-shaped bottom portions, and means communicating said manifold with said collecting chamber, said manifold having an outer wall aligned with said first wall.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |