Patent US3446732A successfully refreshed from Google Patents.
US3446732A
Expired / Lapsed
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Method of purifying waste water
Assignee: Entwicklungsring Sued GmbH
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Filing: 1966-12-05
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Granted: 1969-05-27
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Expires: 1986-12-05
Abstract
No abstract record available.
Inventors
- 👤 Adolf Gasser
- 👤 Georg Ronge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:35
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A METHOD OF PURIFYING WASTE WATER CONTAMINATED BY EMULSIFIED OIL DROPLETS, WHICH COMPRISES; (1) MIXING THE WASTE WATER AT AN ALKALINE PH VALUE WITH OIL AND A SOLUTION OF A FERRIC SALT CAPABLE OF FORMING IRON HYDROXIDE IN AN ALKALINE MEDIUM, WHEREBY FLOCCULENT IRON HYDROXIDE IS FORMED IN NASCENT STATE, (2) ALLOWING THE MIXTURE TO STAND, WHEREBY THE IRON HYDROXIDE, TOGETHER WITH CONTAMINATING OIL DROPLETS AND THE ADDED OIL, RISES TO THE SURFACE TO FORM A TOP LAYER, (3) SEPARATING THE TOP LAYER FROM THE SUBJACENT WATER COLUMN, (4) SUBSEQUENTLY MIXING THE SUBJACENT WATER COLUMN WITH A PURIFYING MATERIAL COMPRISING IRON HYDROXIDE, OIL AND A STABILIZING AGENT, (5) ALLOWING THE MIXTURE TO STAND, WHEREBY REMAINING CONTAMINATING OIL AND THE PURIFYING MATERIAL RISE TO THE SURFACE TO FORM A SURFACE LAYER, AND (6) SEPARATING THE SURFACE LAYER FROM THE REMAINING PURE WATER.
Claim 2
Independent Claim
141 words
A METHOD OF PURIFYING WASTE WATER CONTAMINATED BY EMULSIFIED OIL DROPLETS, WHICH COMPRISES; (1) MIXING THE WASTE WATER AT AN ALKALINE PH VALUE WITH OIL AND A SOLUTION OF A FERRIC SALT CAPABLE OF FORMING IRON HYDROXIDE IN AN ALKALINE MEDIUM, WHEREBY FLOCCULENT IRON HYDROXIDE IS FORMED IN NASCENT STATE, (2) ALLOWING THE MIXTURE TO STAND, WHEREBY THE IRON HYDROXIDE, TOGETHER WITH CONTAMINATING OIL DROPLETS AND THE ADDED OIL, RISES TO THE SURFACE TO FORM A TOP LAYER, (3) SEPARATING THE TOP LAYER FROM THE SUBJACENT WATER COLUMN, (4) SUBSEQUENTLY MIXING THE SUBJACENT WATER COLUMN WITH A PURIFYING MATERIAL COMPRISING IRON HYDROXIDE, OIL AND A STABILIZING AGENT, (5) ALLOWING THE MIXTURE TO STAND, WHEREBY REMAINING CONTAMINATING OIL AND THE PURIFYING MATERIAL RISE TO THE SURFACE TO FORM A SURFACE LAYER, AND (6) SEPARATING THE SURFACE LAYER FROM THE REMAINING PURE WATER.
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) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |