US3645867A
Expired / Lapsed
US
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Method of treating cyanide-containing liquors in surface treatment installations
Assignee: NORDNERO AG
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Filing: 1969-06-19
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Granted: 1972-02-29
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Expires: 1989-06-19
Abstract
Abstract A METHOD OF REMOVING CYANIDE WASTES FROM CYANIDECONTAINING SURFACE TREATING BATHS IN A METAL-TREATING PROCESS WHICH INCLUDES AN ELECTROLYTIC ALKALINE CLEANING BATH AND A CYANIDE-CONTAINING SURFACE TREATING BATH COMPRISING PASSING THE WASTE CYANIDE-CONTAINING WATER FROM THE CYANIDE TREATMENT BATH TO AN ALKALINE ELECTRLYTIC CLEANING BATH, WHEREBY THE CYANIDE IS ELECTROLYTICALLY OXIDIZED.
Inventors
- 👤 Harry A H Ericson
- 👤 Gustav Bertil Norstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:16
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/467; C02F1/4672; C25; C25D; C25D21/00; C25D21/16; C25F; C25F1/00; C02F2101/00; C02F2101/10; C02F2101/16; C02F2101/18; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/903; Y10S210/904
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |