US3729412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sludge concentration
Assignee: Polysar Ltd
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Filing: 1971-03-19
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Granted: 1973-04-24
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Expires: 1991-03-19
Abstract
Abstract A PROCESS IS PROVIDED FOR THE DEWATERING OF A SLUDGE DERIVED FROM THE TREATMENT OF AN INDUSTRIAL WASTE WATER STREAM, WHEREIN THE SLUDGE IS MIXED WITH A LATEX COMPRISING RUBBERY POLYMER AND, ON ADDITION OF A COAGULATING AGENT, A COAGULUM IS FORMED WHICH IS SEPARABLE FROM THE AQUEOUS PHASE.
Inventors
- 👤 Kenzie R Mac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:10
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/008; B; B01; B01J; B01J20/00; B01J20/22; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
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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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |