US2861867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying sodium carbonate and bicarbonate solutions
Assignee: Diamond Shamrock Corp
•
Filing: 1955-01-03
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Granted: 1958-11-25
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Expires: 1975-01-03
Abstract
No abstract record available.
Inventors
- 👤 Hirsch Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:33
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/22; C01D7/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A PROCESS FOR THE REMOVAL OF IRON IMPURITIES FROM A COMPLEX LIQUOR CONTAINING SODIUM CARBONATE AND SODIUM BICARBONATE COMPRISING ADDING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES AND AMMONIUM HYDROXIDE TO THE SAID MIXTURE IN AN AMOUNT AT LEAST EQUIMOLAR TO THE COMBINED QUANTITY OF SODIUM BICARBONATE AND IRON IMPURITIES CONTAINED IN THE SAID LIQUOR; ALLOWING THE MIXTURE THUS PREPARED TO REACT TO SUBSTANTIAL COMPLETION AND SEPARATING THE RESULTING PRECIPITATE FROM THE SAID MIXTURE.
Claim 2
Dependent Claim
78 words
A PROCESS FOR THE REMOVAL OF IRON IMPURITIES FROM A COMPLEX LIQUOR CONTAINING SODIUM CARBONATE AND SODIUM BICARBONATE COMPRISING ADDING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES AND AMMONIUM HYDROXIDE TO THE SAID MIXTURE IN AN AMOUNT AT LEAST EQUIMOLAR TO THE COMBINED QUANTITY OF SODIUM BICARBONATE AND IRON IMPURITIES CONTAINED IN THE SAID LIQUOR; ALLOWING THE MIXTURE THUS PREPARED TO REACT TO SUBSTANTIAL COMPLETION AND SEPARATING THE RESULTING PRECIPITATE FROM THE SAID MIXTURE.
References Cited (Backward Citations)
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Cited
US1373887A
Cited
US2021987A
Cited
US2124894A
Cited
US2642334A
Cited
US2537034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |