US3712797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for evaporating naci brine to separate naci crystals from na2so4
Assignee: Sulzer Escher Wyss AG
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Filing: 1971-03-05
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Granted: 1973-01-23
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Expires: 1991-03-05
Abstract
Abstract PROCESS AND APPARATUS FOR EVAPORATING NACL BRINE CONTAINING NA2SO4, WHEREBY THE CRYSTALLISATION OF NACL FROM THE BRINE IS CARRIED OUT PRACTICALLY TO SATURATION OF THE MOTHER LIQUOR WITH NA2SO4, AND THEN THE MOTHER LIQUOR IS UNDERSATURATED WITH NACL BY BEING HEATED TO A HIGHER TEMPERATURE, WHEREUPON STEPS ARE TAKEN FOR RESATURATION OF THE MOTHER LIQUOR WITH NACL, THE N2SO4 THEN PRECIPITATING IS SEPARATED, AND THE RESIDUAL MOTHER LIQUOR IS RETURNED TO THE NACL CRYSTALLISATION PROCESS.
Inventors
- 👤 R Winkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:56
CPC Classifications
C; C01; C01D; C01D3/00; C01D3/04; C01D3/06; B; B01; B01D; B01D1/00; B01D1/26; C01D3/14; C01D3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |