Patent US3729413A successfully refreshed from Google Patents.
US3729413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the removal of cyanide from sewage by means of formaldehyde
Assignee: Nikex Nehezipari Kulkereskedelmi Vallalat
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Filing: 1971-04-28
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Granted: 1973-04-24
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Expires: 1991-04-28
Abstract
Abstract SEWAGE IS DECYANIZED WITH FORMALDEHYDE AND THE FORMED PRODUCT RECOVERED. THE ESSENCE OF THE METHOD IS THAT A FORMALDEHYDE SOLUTION OF AT LEAST PH 8 ALKALINITY IS ADDED UNDER INTENSIVE AGITATION TO THE SEWAGE, THE SOLUTION ALLOWED TO STAND AT TEMPERATURES RANGING FROM ROOM TEMPERATURE TO 100*C. FOR 50-1 HOURS AND HEADED OR BOILED. TO IMPROVE THE ECONOMY OF THE METHOD IN GIVEN CASES THE AMMONIA IS ABSORBED AND THE FORMED GLYCOLIC ACID RECOVERED FROM THE SOLUTION. THE METHOD CAN BE APPLIED TO THE DETOXICATION OF BOTH DILUTE AND CONCENTRATED CYANIDE-CONTAINING SEWAGE.
Inventors
- 👤 Z Csueroes
- 👤 J Petro
- 👤 Z Dusza
- 👤 J Vaczulin
- 👤 Nee Barczy Z Simo
- 👤 I Turcsan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:52
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/281; C07; C07C; C07C51/00; D; D06; D06M; D06M13/00; D06M13/10; D06M13/184; D06M13/207; C02F2101/00; C02F2101/10; C02F2101/16; C02F2101/18
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) | 1976-04-23 | 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 |