US3598726A
Expired / Lapsed
US
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Water treatment apparatus and method
Assignee: Siemens Water Technologies Holding Corp
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Filing: 1968-08-27
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Granted: 1971-08-10
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Expires: 1988-08-27
Abstract
Abstract AN APPARATUS FOR AND METHOD OF REMOVING NUTRIENTS SUCH AS NITRATES, PHOSPHATES OR CARBONACEOUS MATERIALS FROM WATER. THE WATER TO BE TREATED IS CONTACTED BY ROTATINGS DISKS HAVING TAPERED SURFACES. ALGAE ARE SUPPLIED TO THE WATER AND ARE PICKED UP BY THE ROTATING DISKS, BEING SUPPORTED BY THE TAPERED SURFACES OF THE DISKS. THE ALGAE ON THE DISKS ARE EXPOSED TO THE COMBINED EFFECTS OF SUNLIGHT, EITHER NATURAL OR ARTIFICIAL, AND TO AN ATMOSPHERE OF CARBON DIOXIDE (CO2). THE ALGAE REMOVE THE NUTRIENTS FROM THE WATER, AND REDUCE THE CARBON DIOXIDE PRESENT IN THE ATMOSPHERE ABOVE THE LIQUID TO OXYGEN (O2).
Inventors
- 👤 Fredrick M Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:17
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/082; C02F3/32; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y02W10/30; Y02W10/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |