Patent US3736254A successfully refreshed from Google Patents.
US3736254A
Expired / Lapsed
US
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System for removing color from paper mill liquid waste
Assignee: OI Glass Inc
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Filing: 1971-06-03
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Granted: 1973-05-29
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Expires: 1991-06-03
Abstract
Abstract WASTE EFFUENT LIQUID FROM A PAPER MILL IS INTIMATELY MIXED WITH A WATER SLURRY OF LIME AND A WATER SLURRY OF LIME MUD, COMPOSED PRINCIPALLY OF CALCIUM CARBONATE, UNDER ALKALINE CONDITIONS, THE RESULTING MIXTURE BEING SUBJECTED TO CLARIFICATION SEPARATION OF FORMED PRECIPITANTS, FOLLOWING WHICH, THE LIQUID EFFUENT OVERFLOW IS CARBONATE BY THEBUBBLLING OF CARBON DIOXIDE GAS THERETHROUGH TO PRECIPITATE CALCIUM CARBONATE AND RESIDUAL COLOR-IMPARTING ENTITIES AND TO EFFECT ADJUSTMENT OF THE PH TO APPROXIMATELY NEUTRAL CONDITIONS WHEREBY THE RESULTANT LIWUID IS ADAPTED FOR DISCHARGE.
Inventors
- 👤 H Croom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:55
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/917; Y10S210/928
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |