Patent US3752749A successfully refreshed from Google Patents.
US3752749A
Expired / Lapsed
US
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Electrodialytic removal of acid from aqueous effluent
Assignee: Honeywell International Inc
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Filing: 1971-09-27
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Granted: 1973-08-14
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Expires: 1991-09-27
Abstract
Abstract THE ELECTRODIALYTIC CONCENTRATION AND REMOVAL OF ACIDS FROM AQUEOUS EFFLUENTS, E.G., MALIC ACID EFFLUENT CONTAINING LESS THAN ABOUT 10% MALIC ACID, TO PRODUCE TWO STREAMS, A RELATIVELY CONCENTRATED AQUEOUS CONCENTRATE STREAM OF ABOUT 30% ACID AND A RELATIVELY DILUTE STREAM OF LESS THAN ABOUT 03% ACID, IS DISCLOSED. THE PROCESS, CONTINUOUS, SEMICONTINUOUS OR BATCH OFFERS A PARTICAL SOLUTION FROM THE STANDPOINT OF MEETING POLLUTION CONTROL STANDARDS AND FOR SEPARATING OR RECOVERING ACIDS WHICH MAY BE RETURNED TO THE PROCESS BY DIRECT RECYCLING.
Inventors
- 👤 F Chlanda
- 👤 H Gregor
- 👤 K Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:58
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/52; C; C07; C07C; C07C51/00; C07C51/42
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |