US3843516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating waste solutions containing cyano-heavy metal-complex compounds
Assignee: Toyo Gas Chemical Industry Ltd
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Filing: 1973-01-08
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Granted: 1974-10-22
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Expires: 1993-01-08
Abstract
Abstract 1. A PROCESS FOR TREATING AN AQUEOUS SOLUTION CONTAINING FERRICYANIDE AND FERROCYANIDE COMPLEX COMPOUNDS WHICH COMPRISES ADDING TO SAID SOLUTION (1) PHOSPHORIC ACID, (2) SULFURIC ACID AND (3) AN OXIDIZING AGENT, AND THEN DECOMPOSING THE MIXTURE TO CONVERT THE IRON INTO A SOLUBLE IRON SALT AND TO REMOVE CYANIDE FROM THE SOLUTION.
Inventors
- 👤 T Yamada
- 👤 M Ito
- 👤 K Hirata
- 👤 T Sugahara
- 👤 S Murakami
- 👤 S Kondo
- 👤 S Yoshihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:55
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F2101/00; C02F2101/10; C02F2101/16; C02F2101/18; C02F2101/20; C02F2101/22; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/903; Y10S210/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR TREATING AN AQUEOUS SOLUTION CONTAINING FERRICYANIDE AND FERROCYANIDE COMPLEX COMPOUNDS WHICH COMPRISES ADDING TO SAID SOLUTION (1) PHOSPHORIC ACID, (2) SULFURIC ACID AND (3) AN OXIDIZING AGENT, AND THEN DECOMPOSING THE MIXTURE TO CONVERT THE IRON INTO A SOLUBLE IRON SALT AND TO REMOVE CYANIDE FROM THE SOLUTION.
Claim 2
Dependent Claim
51 words
A PROCESS FOR TREATING AN AQUEOUS SOLUTION CONTAINING FERRICYANIDE AND FERROCYANIDE COMPLEX COMPOUNDS WHICH COMPRISES ADDING TO SAID SOLUTION (1) PHOSPHORIC ACID, (2) SULFURIC ACID AND (3) AN OXIDIZING AGENT, AND THEN DECOMPOSING THE MIXTURE TO CONVERT THE IRON INTO A SOLUBLE IRON SALT AND TO REMOVE CYANIDE FROM THE SOLUTION.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |