US2640762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for evaporating sodium sulfate solutions and recovering sodium sulfate therefrom
Assignee: West End Chemical Co
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Filing: 1951-07-13
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Granted: 1953-06-02
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Expires: 1971-07-13
Abstract
No abstract record available.
Inventors
- 👤 James V Wiseman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:17
CPC Classifications
C; C01; C01D; C01D5/00; C01D5/18; B; B01; B01D; B01D1/00; B01D1/14; B01D1/16; B01D1/22; B01D9/00; B01D9/0018; B01D9/0031; B01D9/0036; B01D9/0059
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A PROCESS FOR EVAPORATING WATER FROM AN AQUEOUS SOLUTION OF SODIUM SULFATE COMPRISING CONTINUOUSLY SPRAYING THE SOLUTION INTO AN UPPER PORTION OF AN EVAPORATION ZONE, CONTINUOUSLY INTRODUCING INTO AN UPPER PORTION OF SAID ZONE, BUT OUT OF DIRECT CONTACT THEREWITH, A DRY HOT GAS AND ADDITIONAL SODIUM SULFATE SOLUTION, CONDUCTING SAID GAS AND ADDITIONAL SODIUM SULFATE SOLUTION DOWNWARDLY THROUGH SAID EVAPORATION ZONE BUT STILL OUT OF DIRECT CONTACT THEREWITH AND THEN REVERSING THE GAS FLOW UP INTO THE EVAPORATION ZONE INTO DIRECT CONTACT WITH SAID SPRAYED SOLUTION, WHILE CONFINING SAID GAS IN A REGION BOUNDED AND DEFINED BY A CONTINUOUS FILM OF SOLUTION, MAINTAINING ALL SURFACES DEFINING SAID ZONE WET CONTINUOUSLY WITH A FILM OF SAID SOLUTION, COLLECTING SOLUTION FROM SAID ZONE ADJACENT THE BOTTOM THEREOF, AND RECOVERING SOLID SODIUM SULFATE FROM THE SOLUTION.
Claim 2
Dependent Claim
134 words
A PROCESS FOR EVAPORATING WATER FROM AN AQUEOUS SOLUTION OF SODIUM SULFATE COMPRISING CONTINUOUSLY SPRAYING THE SOLUTION INTO AN UPPER PORTION OF AN EVAPORATION ZONE, CONTINUOUSLY INTRODUCING INTO AN UPPER PORTION OF SAID ZONE, BUT OUT OF DIRECT CONTACT THEREWITH, A DRY HOT GAS AND ADDITIONAL SODIUM SULFATE SOLUTION, CONDUCTING SAID GAS AND ADDITIONAL SODIUM SULFATE SOLUTION DOWNWARDLY THROUGH SAID EVAPORATION ZONE BUT STILL OUT OF DIRECT CONTACT THEREWITH AND THEN REVERSING THE GAS FLOW UP INTO THE EVAPORATION ZONE INTO DIRECT CONTACT WITH SAID SPRAYED SOLUTION, WHILE CONFINING SAID GAS IN A REGION BOUNDED AND DEFINED BY A CONTINUOUS FILM OF SOLUTION, MAINTAINING ALL SURFACES DEFINING SAID ZONE WET CONTINUOUSLY WITH A FILM OF SAID SOLUTION, COLLECTING SOLUTION FROM SAID ZONE ADJACENT THE BOTTOM THEREOF, AND RECOVERING SOLID SODIUM SULFATE FROM THE SOLUTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |