US2690430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a fluoride-containing composition
Assignee: Dow Chemical Co
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Filing: 1949-11-16
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Granted: 1954-09-28
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Expires: 1969-11-16
Abstract
No abstract record available.
Inventors
- 👤 Raymond J Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:29
CPC Classifications
C; C01; C01D; C01D15/00; C01D15/04; C01D3/00; C01D3/02; C01F; C01F11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A METHOD OF PRODUCTING A USEFUL FLUORIDECONTAINING PRODUCT WHICH COMPRISES HEATING CALCIUM FLUORIDE WITH AQUEOUS SODIUM HYDOXIDE IN AT LEAST A MOLECULARLY EQUIVALENT PROPORTION IN THE ABSENCE OF CARBONATES AND SILATES AT A TEMPERATURE OF 80* TO 160* C. FOR A TIME SUFFICIENT TO CONVERT AT LEAST A MAJOR PART OF THE CALCIUM FLUORIDE TO SODIUM FLUORIDE, AND VAPORIZING WATER FROM THE RESULTING MIXTURE AT A TEMPERATURE WITHIN THE SAID RANGE UNTIL IT IS CONVERTED TO A DRY, FRIABLE SOLID.
Claim 2
Independent Claim
80 words
A METHOD OF PRODUCTING A USEFUL FLUORIDECONTAINING PRODUCT WHICH COMPRISES HEATING CALCIUM FLUORIDE WITH AQUEOUS SODIUM HYDOXIDE IN AT LEAST A MOLECULARLY EQUIVALENT PROPORTION IN THE ABSENCE OF CARBONATES AND SILATES AT A TEMPERATURE OF 80* TO 160* C. FOR A TIME SUFFICIENT TO CONVERT AT LEAST A MAJOR PART OF THE CALCIUM FLUORIDE TO SODIUM FLUORIDE, AND VAPORIZING WATER FROM THE RESULTING MIXTURE AT A TEMPERATURE WITHIN THE SAID RANGE UNTIL IT IS CONVERTED TO A DRY, FRIABLE SOLID.
References Cited (Backward Citations)
US1613656A
Cited
US1722137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |