Patent US3361666A successfully refreshed from Google Patents.
Patent US2788259A successfully refreshed from Google Patents.
US2788259A
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US
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Process for production of alkali ferrocyanides and ammonium sulfate
Assignee: Imperial Paper and Color Corp
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Filing: 1955-03-15
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Granted: 1957-04-09
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Expires: 1975-03-15
Abstract
No abstract record available.
Inventors
- 👤 Alfred E Van Wirt
- 👤 Louis J Gagliano
- 👤 Clarence W Shonnard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:24
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/08; C01C3/12; C01C1/00; C01C1/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
THE PROCESS OF PRODUCING ALKALI METAL FERROCYANIDE AND AMMONIUM SULFATE WHICH COMPRISES REACTING THE PRODUCT GAS OF THE AMMONIA, METHANE AND AIR REAC TION CONTAINING HYDROGEN CYANIDE AND AMMONIA AND A SMALL AMOUNT OF CARBON DIOXIDE WITH AN AQUEOUS SLURRY OF ALKALI METAL HYDROGEN, FERROUS HYDROXIDE PRODUCED IN THE PROCESS AND LIME, TO FORM WITH THE HYDROGEN CYANIDE THE ALKALI METAL FERROCYANIDE IN SOLUTION AND WITH THE CARBON DIOXIDE TO FORM CALCIUM CARBONATE, SEPARATING FROM THE SOLUTION ANY RESIDUAL FERROUS HYDROXIDE AND THE CALCIUM CARBONATE LEAVING IN THE SOLUTION SODIUM FERROCYANIDE, AND THEN PASSING THE REMAINING GAS CONTAINING AMMONIA INTO CONTACT WITH AN AQUEOUS SOLUTION OF FERROUS SULFATE TO FORM AMMONIUM SULFATE AND THE FERROUS HYDROXIDE USED IN THE PRECEDING REACTION.
Claim 2
Dependent Claim
121 words
THE PROCESS OF PRODUCING ALKALI METAL FERROCYANIDE AND AMMONIUM SULFATE WHICH COMPRISES REACTING THE PRODUCT GAS OF THE AMMONIA, METHANE AND AIR REAC TION CONTAINING HYDROGEN CYANIDE AND AMMONIA AND A SMALL AMOUNT OF CARBON DIOXIDE WITH AN AQUEOUS SLURRY OF ALKALI METAL HYDROGEN, FERROUS HYDROXIDE PRODUCED IN THE PROCESS AND LIME, TO FORM WITH THE HYDROGEN CYANIDE THE ALKALI METAL FERROCYANIDE IN SOLUTION AND WITH THE CARBON DIOXIDE TO FORM CALCIUM CARBONATE, SEPARATING FROM THE SOLUTION ANY RESIDUAL FERROUS HYDROXIDE AND THE CALCIUM CARBONATE LEAVING IN THE SOLUTION SODIUM FERROCYANIDE, AND THEN PASSING THE REMAINING GAS CONTAINING AMMONIA INTO CONTACT WITH AN AQUEOUS SOLUTION OF FERROUS SULFATE TO FORM AMMONIUM SULFATE AND THE FERROUS HYDROXIDE USED IN THE PRECEDING REACTION.
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) | 1960-04-08 | 1960-10-08 | 1961-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-08 | 1964-10-08 | 1965-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-08 | 1968-10-08 | 1969-04-09 | $7700.00 | Window Closed / Lapsed |