Patent US2887360A successfully refreshed from Google Patents.
US2887360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of sodium carbonate monohydrate
Assignee: Columbia Southern Chemical Corp
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Filing: 1956-12-07
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Granted: 1959-05-19
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Expires: 1976-12-07
Abstract
No abstract record available.
Inventors
- 👤 Howard H Hoekje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:51
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/22; C01D7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A METHOD OF PURIFYING IMPURE SODIUM CARBONATE WHICH IS CONTAMINATED WITH AN IMPURITY OF THE GROUP CONSISTING OF BORON COMPOUNDS, SILICA, CHLORIDE AND SULPHATE WHICH COMPRISES FROMING AN AQUEOUS SLURRY OF SAID IMPURE SODIUM CARBONATE IN WHICH SOLID SODIUM CARBONATE THERIN IS PRESENT AS SODIUM CARBONATE MONOHYDRATE CRYSTALS RAISING THE TEMPERATURE OF SAID SLURRY TO ABOVE THE SODIUM CARBONATE MONOHYDRATE-UNHYDRATED SODIUM CARBONATE TRANSITION TEMPERATURE OF ABOUT 112*C. UNTIL THE SODIUM CARBONATE MONOHYDRATE CRYSTALS ARE CONVERTED TO UNHYDRATED SODIUM CARBONATE CRYSTALS, THEREAFTER COOLING THE SLURRY TO CAUSE REFORMATION OF SODIUM CARBONATE MONOHYDRATE, THUS FORMING A MOTHER LIQUOR HAVING IMPURITIES OF SAID IMPURE SODIUM CARBONATE DISSOLVED THEREIN IN WHICH THE REFORMED SODIUM CARBONATE MONOHYDRATE IS IN CONTACT, AND REMOVING THE MOTHER LIQUOR FROM THE REFORMED SODIUM CARBONATE MONOHYDRATE.
Claim 2
Independent Claim
126 words
A METHOD OF PURIFYING IMPURE SODIUM CARBONATE WHICH IS CONTAMINATED WITH AN IMPURITY OF THE GROUP CONSISTING OF BORON COMPOUNDS, SILICA, CHLORIDE AND SULPHATE WHICH COMPRISES FROMING AN AQUEOUS SLURRY OF SAID IMPURE SODIUM CARBONATE IN WHICH SOLID SODIUM CARBONATE THERIN IS PRESENT AS SODIUM CARBONATE MONOHYDRATE CRYSTALS RAISING THE TEMPERATURE OF SAID SLURRY TO ABOVE THE SODIUM CARBONATE MONOHYDRATE-UNHYDRATED SODIUM CARBONATE TRANSITION TEMPERATURE OF ABOUT 112*C. UNTIL THE SODIUM CARBONATE MONOHYDRATE CRYSTALS ARE CONVERTED TO UNHYDRATED SODIUM CARBONATE CRYSTALS, THEREAFTER COOLING THE SLURRY TO CAUSE REFORMATION OF SODIUM CARBONATE MONOHYDRATE, THUS FORMING A MOTHER LIQUOR HAVING IMPURITIES OF SAID IMPURE SODIUM CARBONATE DISSOLVED THEREIN IN WHICH THE REFORMED SODIUM CARBONATE MONOHYDRATE IS IN CONTACT, AND REMOVING THE MOTHER LIQUOR FROM THE REFORMED SODIUM CARBONATE MONOHYDRATE.
References Cited (Backward Citations)
US1907987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |