US2773752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallization of sodium cyanide
Assignee: EIDP Inc
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Filing: 1953-07-20
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Granted: 1956-12-11
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Expires: 1973-07-20
Abstract
No abstract record available.
Inventors
- 👤 Vincent W Kremer
- 👤 Charles H Lemke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:09
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/08; C01C3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE METHOD OF PRODUCING WHITE CRYSTALLINE SODIUM CYANIDE WHICH COMPRISES CONTINOUSLY FEEDING A CONCENTRATED SOLUTION OF SODIUM CYANIDE INTO AN EXVAPORATOR HELD AT A TEMPERATURE OF 50*-70* C. AND A PRESSURE OF 40 80 MM. OF MERCURY FORMING A SLURRY IN SAID EVAPORATOR COMPRISING SATURATED MOTHER LIQUOR AND CRYSTALS OF SODIUM CYANIDE, MAINTAINING A CONCENTRATION OF SODIUM HYDROXIDE OF BETWEEN 0.2 AND 3% IN SAID MOTHER LIQUOR AND CONTINUOUSLY SEPARATING A PORTION OF SAID CRYSTALS FORM SAID MOTHER LIQUOR AND RECYCLING A PORTION OF SAID LIQUOR.
Claim 2
Independent Claim
86 words
THE METHOD OF PRODUCING WHITE CRYSTALLINE SODIUM CYANIDE WHICH COMPRISES CONTINOUSLY FEEDING A CONCENTRATED SOLUTION OF SODIUM CYANIDE INTO AN EXVAPORATOR HELD AT A TEMPERATURE OF 50*-70* C. AND A PRESSURE OF 40 80 MM. OF MERCURY FORMING A SLURRY IN SAID EVAPORATOR COMPRISING SATURATED MOTHER LIQUOR AND CRYSTALS OF SODIUM CYANIDE, MAINTAINING A CONCENTRATION OF SODIUM HYDROXIDE OF BETWEEN 0.2 AND 3% IN SAID MOTHER LIQUOR AND CONTINUOUSLY SEPARATING A PORTION OF SAID CRYSTALS FORM SAID MOTHER LIQUOR AND RECYCLING A PORTION OF SAID LIQUOR.
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) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |