US3706531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of sodium sulphate
Assignee: Societa Italiana Resine SpA SIR
•
Filing: 1970-12-07
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Granted: 1972-12-19
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Expires: 1990-12-07
Abstract
Abstract SODIUM SULPHATE IS MADE FROM A SOLUTION OF THE FERROUS SULPHATE BY PRODUCT OF TITANIUM DIOXIDE MANUFACTURE, BY PRECIPITATING IRON HYDROXIDE WITH SODIUM HYDROXIDE, REMOVING THE IRON HYDROXIDE, PRECIPITATING PART OF THE SODIUM SULPHATE FORMED IN THE SOLUTION BY ADDING MORE SODI- UM HYDROXIDE AND RECYCLING THE RESIDUAL LIQUOR TO THE IRON HYDROXIDE PRECIPITATION STAGE.
Inventors
- 👤 Giorgio Cozza
- 👤 Gabriele Bottai
- 👤 Filippo Barilli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:49
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/07; C01D5/00; Y; Y10; Y10S; Y10S423/00; Y10S423/01; Y10S423/02
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |