US3029133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing strontium carbonate and strontium sulfate from brines containing calcium and strontium halides
Assignee: Dow Chemical Co
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Filing: 1959-01-22
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Granted: 1962-04-10
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Expires: 1979-01-22
Abstract
No abstract record available.
Inventors
- 👤 Robert D Goodenough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:26
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/46; C01F11/462
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
THE METHOD OF PRODUCING FINELY DIVIDED STRONIUM CARBONATE OF LOW BARIUM CONTAMINATION FROM A BRINE CONTAINING HALIDES IN SOLUTION INCLUDING THOSE SELECTED FROM THE GROUP CONSISTING OF BROMIDES CHLORIDES AND UODIDES OF STRONTIUM AND CALCIUM WHEREIN THE MOLAR RATIO OF CA TO SR IS NOT OVER 7 WHICH CONSISTS OF ADMIXING THEREWITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SULFATE SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFATE MAGNESIUM SULFATE AND SULFORIC ACID AT A TEMPERATURE OF BETWEEN 96* AND 109* C. FOR BETWEEN 5 AND 15 MINUTES TO PRECIPITATE CRUDE STRONTIUM SULFATE CONTAMINATED
References Cited (Backward Citations)
US2764472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |