US3705790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for increasing bulk density of sodium carbonate by the addition of calcium ion
Assignee: Henley Group Inc
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Filing: 1970-12-01
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Granted: 1972-12-12
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Expires: 1990-12-01
Abstract
Abstract INVENTION RELATES TO AN IMPROVED PROCESS FOR THE PREPARATION OF SODIUM CARBONATE PRECURSOR CRYSTALS BY A CRYSTALLIZATION PROCESS WHICH INVOLVES FORMING A FIRST CROP OF SAID CARBONATE PRECURSOR CRYSTALS FROM A SUBSTANTIALLY SATURATED CARBONATE PROCESS SOLUTION AND PROVIDING IN THE MOTHER LIQUOR SEPARATD FROM SAID FIRST CROP OF CRYSTALS A SUFFICIENT AMOUNT OF CALCIUM IONS SUCH THAT WHEN THE MOTHER LIQUOR IS SUBJECTED TO CRYSTALLIZATION AT A TEMPERATURE HIGHER THAN THAT EMPLOYED TO OBTAIN THE FIRST CROP OF SAID PRECURSOR CRYSTALS, A SECOND CROP OF SODIUM CARBONATE PRECURSOR CRYSTALS OF IMPROVED QUALITY IS OBTAINED.
Inventors
- 👤 Norman R Garofano
- 👤 Alan G Follows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:13
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/38; C01D7/40; C01D7/35; C01D7/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |