US2980502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strontium chromate from brine
Assignee: Dow Chemical Co
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Filing: 1959-01-22
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Granted: 1961-04-18
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Expires: 1979-01-22
Abstract
No abstract record available.
Inventors
- 👤 Robert D Goodenough
- 👤 Vernon A Stenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:26
CPC Classifications
C; C01; C01G; C01G37/00; C01G37/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
THE METHOD OF MAKING STRONTIUM CHROMATE FROM A BRINE CONTAINING A STRONTIUM SALT INTERMIXED WITH OTHER SALTS INCLUDING CALCIUM SALTS IN A RATIO OF CA:SR OF NOT OVER 20:1 DISSOLVED THEREIN CONSISTING OF ADMIXING WITH THE BRINE AN AQUEOUS SOLUTION OF A SOLUBLE CHROMATE IN AN AMOUNT BETWEEN 80 AND 100 PERCENT OF THE STOICHIOMETRIC QUANTITY REQUIRED TO REACT WITH THE STRONTIUM VALUES PRESENT AT A TEMPERATURE OF BETWEEN 90* AND 110*C., DIGESTING THE RESULTING MIXTURE FOR AT LEAST 5 MINUTES TO PRECIPITATE STRONTIUM CHROMATE, AND SEPARATING AND WASHING THE THUS PRECIPITATED STRONTIUM CHROMATE.
Claim 2
Independent Claim
94 words
THE METHOD OF MAKING STRONTIUM CHROMATE FROM A BRINE CONTAINING A STRONTIUM SALT INTERMIXED WITH OTHER SALTS INCLUDING CALCIUM SALTS IN A RATIO OF CA:SR OF NOT OVER 20:1 DISSOLVED THEREIN CONSISTING OF ADMIXING WITH THE BRINE AN AQUEOUS SOLUTION OF A SOLUBLE CHROMATE IN AN AMOUNT BETWEEN 80 AND 100 PERCENT OF THE STOICHIOMETRIC QUANTITY REQUIRED TO REACT WITH THE STRONTIUM VALUES PRESENT AT A TEMPERATURE OF BETWEEN 90* AND 110*C., DIGESTING THE RESULTING MIXTURE FOR AT LEAST 5 MINUTES TO PRECIPITATE STRONTIUM CHROMATE, AND SEPARATING AND WASHING THE THUS PRECIPITATED STRONTIUM CHROMATE.
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) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |