Patent US3247102A successfully refreshed from Google Patents.
US3247102A
Expired / Lapsed
US
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Process for the elutriation of digested sludge
Assignee: Dow Chemical Co
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Filing: 1964-01-13
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Granted: 1966-04-19
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Expires: 1984-01-13
Abstract
No abstract record available.
Inventors
- 👤 Charles P Priesing
- 👤 Mogelnicki Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:36
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
IN THE ELUTRIATION OF A DIGESTED SEWAGE SLUDGE WHICH COMPRISES THE STEPS OF FEEDING A DIGESTED SEWAGE SLUDGE TO A MIXING ZONE CONCOMITANTLY WITH AN AQUEOUS WASHING MEDIUM, THEREAFTER SETTLING THE RESULTING WASHED SOLIDS AND WITHDRAWING THE AQUEOUS WASHING MEDIUM ELUTRIATE AS AN OVERHEAD FROM THE SETTLED SOLIDS, THE IMPROVEMENT WHICH CONSISTS IN INCORPORATING EACH OF (1) AN ADDITIVE, NONDIGESTED SEWAGE SLUDGE AND (2) A WATER-SOLUBLE, ANIONIC ORGANIC POLYMERIC FLOCCULANT INTO THE MIXING ZONE WHEREIN INTERMIXING OF THE NON-DIGESTED SEWAGE SLUDGE, POLYMERIC FLOCCULANT, DIGESTED SEWAGE SLUDGE AND WASHING MEDIUM OCCURS; THE RATE OF INCORPORATING THE ADDITIVE NON-DIGESTED SEWAGE SLUDGE INTO THE MIXING ZONE BEING SUFFICIENT TO PROVIDE FROM ABOUT 5 TO ABOUT 50 PERCENT BY WEIGHT ADDITIONAL SOLIDS BASED ON THE WEIGHT OF THE DIGESTED SLUDGE SOLIDS AND THE RATE OF INCORPORATING THE ORGANIC, ANIONIC POLYMERIC FLUOCCULANT INTO THE MIXING ZONE BEING SUFFICIENT TO ENHANCE THE RATE AT WHICH THE RESULTING BLENDED SLUDGE SOLIDS SETTLE.
Claim 2
Dependent Claim
155 words
IN THE ELUTRIATION OF A DIGESTED SEWAGE SLUDGE WHICH COMPRISES THE STEPS OF FEEDING A DIGESTED SEWAGE SLUDGE TO A MIXING ZONE CONCOMITANTLY WITH AN AQUEOUS WASHING MEDIUM, THEREAFTER SETTLING THE RESULTING WASHED SOLIDS AND WITHDRAWING THE AQUEOUS WASHING MEDIUM ELUTRIATE AS AN OVERHEAD FROM THE SETTLED SOLIDS, THE IMPROVEMENT WHICH CONSISTS IN INCORPORATING EACH OF (1) AN ADDITIVE, NONDIGESTED SEWAGE SLUDGE AND (2) A WATER-SOLUBLE, ANIONIC ORGANIC POLYMERIC FLOCCULANT INTO THE MIXING ZONE WHEREIN INTERMIXING OF THE NON-DIGESTED SEWAGE SLUDGE, POLYMERIC FLOCCULANT, DIGESTED SEWAGE SLUDGE AND WASHING MEDIUM OCCURS; THE RATE OF INCORPORATING THE ADDITIVE NON-DIGESTED SEWAGE SLUDGE INTO THE MIXING ZONE BEING SUFFICIENT TO PROVIDE FROM ABOUT 5 TO ABOUT 50 PERCENT BY WEIGHT ADDITIONAL SOLIDS BASED ON THE WEIGHT OF THE DIGESTED SLUDGE SOLIDS AND THE RATE OF INCORPORATING THE ORGANIC, ANIONIC POLYMERIC FLUOCCULANT INTO THE MIXING ZONE BEING SUFFICIENT TO ENHANCE THE RATE AT WHICH THE RESULTING BLENDED SLUDGE SOLIDS SETTLE.
References Cited (Backward Citations)
US3105041A
Cited
US3142638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |