US2742344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of sodium cyanide
Assignee: EIDP Inc
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Filing: 1953-03-16
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Granted: 1956-04-17
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Expires: 1973-03-16
Abstract
No abstract record available.
Inventors
- 👤 Byron N Inman
- 👤 Charles H Lemke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:10
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/08; C01C3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE METHOD OF PRODUCING SODIUM CYANIDE SOLUTIONS IN SUBSTANTIALLY PURE CONDITION WHICH COMPRISES PASSING THROUGH AN AQUEOUS SODIUM HYDROXIDE SOLUTION AT A TEMPERATURE NOT EXCEEDING ABOUT 60* C. GASEOUS HYDROGEN CYANIDE CONTAMINATED WITH CARBON DIOXIDE TO PRODUCE A SOLUTION CONTAINING 25-37.5% BY WEIGHT OF SODIUM CYANIDE AND AROUND 0.2-05% BY WEIGHT OF SODIUM HYDROXIDE, ADDING TO THE SOLUTION AN AQUEOUS SOLUTION OF CALCIUM CYANIDE TO PRECIPITATE CARBONATE AND FORMATE THEREFROM BUT INSUFFICIENT IN QUANTITY TO INTRODUCE CONTAMINATING CALCIUM IONS AND SEPARATING THE PRECIPITATE FROM THE PURIFIED SODIUM CYANIDE SOLUTION.
Claim 2
Independent Claim
89 words
THE METHOD OF PRODUCING SODIUM CYANIDE SOLUTIONS IN SUBSTANTIALLY PURE CONDITION WHICH COMPRISES PASSING THROUGH AN AQUEOUS SODIUM HYDROXIDE SOLUTION AT A TEMPERATURE NOT EXCEEDING ABOUT 60* C. GASEOUS HYDROGEN CYANIDE CONTAMINATED WITH CARBON DIOXIDE TO PRODUCE A SOLUTION CONTAINING 25-37.5% BY WEIGHT OF SODIUM CYANIDE AND AROUND 0.2-05% BY WEIGHT OF SODIUM HYDROXIDE, ADDING TO THE SOLUTION AN AQUEOUS SOLUTION OF CALCIUM CYANIDE TO PRECIPITATE CARBONATE AND FORMATE THEREFROM BUT INSUFFICIENT IN QUANTITY TO INTRODUCE CONTAMINATING CALCIUM IONS AND SEPARATING THE PRECIPITATE FROM THE PURIFIED SODIUM CYANIDE SOLUTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |