Patent US3284350A successfully refreshed from Google Patents.
US3284350A
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Removal of tin and fluoride from aqueous solutions of the same
Assignee: National Steel Corp
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Filing: 1964-02-12
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Granted: 1966-11-08
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Expires: 1984-02-12
Abstract
No abstract record available.
Inventors
- 👤 Robert C Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:27
CPC Classifications
C; C02; C02F; C02F9/00; C01; C01G; C01G19/00; C01G19/02; C02F2101/00; C02F2101/10; C02F2101/20; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD OF REMOVING TIN AND FLUORIDE FROM DISTION IN WATER, COMPRISING ADDING, TO WATER CONTAINING DISSOLVED TIN IN THE STANNIC OXIDATION STATE AND FLUORIDE, CALCIUM HYDROXIDE IN AN AMOUNT TO PRECIPITATE A GREATER PROPORTION FO THE DISSOLVED TIN THAN OF THE DISSOLVED FLUORIDE, THE PRECIPITATE CONTAINING STANNIC HYDROXIDE, SEPARATING THE PRECIPITATE CONTAINING STANNIC HYDROXIDE FROM AT LEAST MOST OF THE WATER, AND THEREAFTER ADDING TO THE WATER MORE CALCIUM HYDROXIDE IN AN AMOUNT TO PRECIPITATE A GREATER PROPORTION OF THE ORIGINAL DISSOLVED FLUORIDE THAN OF THE ORIGINAL DISSOLVED TIN.
Claim 2
Independent Claim
90 words
A METHOD OF REMOVING TIN AND FLUORIDE FROM DISTION IN WATER, COMPRISING ADDING, TO WATER CONTAINING DISSOLVED TIN IN THE STANNIC OXIDATION STATE AND FLUORIDE, CALCIUM HYDROXIDE IN AN AMOUNT TO PRECIPITATE A GREATER PROPORTION FO THE DISSOLVED TIN THAN OF THE DISSOLVED FLUORIDE, THE PRECIPITATE CONTAINING STANNIC HYDROXIDE, SEPARATING THE PRECIPITATE CONTAINING STANNIC HYDROXIDE FROM AT LEAST MOST OF THE WATER, AND THEREAFTER ADDING TO THE WATER MORE CALCIUM HYDROXIDE IN AN AMOUNT TO PRECIPITATE A GREATER PROPORTION OF THE ORIGINAL DISSOLVED FLUORIDE THAN OF THE ORIGINAL DISSOLVED TIN.
References Cited (Backward Citations)
US2914474A
Cited
US3082157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |