Patent US3659720A successfully refreshed from Google Patents.
US3659720A
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US
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Sedimentation system
Assignee: Purac AB
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Filing: 1970-10-27
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Granted: 1972-05-02
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Expires: 1990-10-27
Abstract
Abstract A system for purifying water and sewage by forcing a liquid that is to be sedimented flow from the lower portion of a basin and upwards while sedimented matter in the liquid sinks downwardly in the basin. Concentrically positioned elements are located at the surface of the liquid for draining off purified liquid through fall pipes that interconnect the elements with discharge pipes at the bottom of the basin.
Inventors
- 👤 Lars G Malm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:38
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/02; B01D21/04; B01D21/06; B01D21/003; B01D21/0039; B01D21/0042; B01D21/24; B01D21/2405; B01D21/2427; B01D21/2444
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A sedimentation system for purifying liquid having suspension comprising, a basin for holding liquid; A basin inlet pipe for flowing liquid, such as liquid having suspended matter into the basin, whereby the liquid in the basin will have an increasing degree of purity towards the upper surface end of the basin with sedimented matter sinking towards the bottom of the basin; a plurality of concentrically positioned elements disposed at approximately equal radial increments across the entire upper surface level of the liquid in the basin for drawing off the purified liquid in the basin from the entire surface portion of the liquid in the basin; a discharge pipe connected to the bottom of the basin for removing the purified liquid and a plurality of vertical fall pipes for interconnecting the concentrical positioned elements with the discharge pipe.
Claim 2
Dependent Claim
137 words
A sedimentation system for purifying liquid having suspension comprising, a basin for holding liquid; A basin inlet pipe for flowing liquid, such as liquid having suspended matter into the basin, whereby the liquid in the basin will have an increasing degree of purity towards the upper surface end of the basin with sedimented matter sinking towards the bottom of the basin; a plurality of concentrically positioned elements disposed at approximately equal radial increments across the entire upper surface level of the liquid in the basin for drawing off the purified liquid in the basin from the entire surface portion of the liquid in the basin; a discharge pipe connected to the bottom of the basin for removing the purified liquid and a plurality of vertical fall pipes for interconnecting the concentrical positioned elements with the discharge pipe.
Claim 3
Dependent Claim
37 words
A sedimentation system in accordance with claim 1, comprising partitions disposed in connection with the concentrically disposed elements and and fall pipes, respectively, for dividing the basin into a plurality of concentrical portions communicating with each other.
Claim 4
Dependent Claim
20 words
A sedimentation system in accordance with claim 1, wherein the fall pipes affix the concentrically positioned elements of the basin.
Claim 5
Dependent Claim
29 words
A sedimentation system in accordance with claim 1, comprising means for physically pretreating a volume of liquid communicating with the external sedimentation volume around the center of the basin.
Claim 6
Dependent Claim
37 words
A sedimentation system as in claim 2 further including slime scraper means for scraping the bottom of the basin including individual scrapers suspended from the top of the basin and extending down between each pair of partitions.
Claim 7
Dependent Claim
31 words
A sedimentation system as in claim 2 wherein the fall pipes affix the concentrically positioned elements of the basin and each of the partitions extend the same depth into the liquid.
References Cited (Backward Citations)
US2428756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |