US3176756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for multiple-effect evaporators
Assignee: Elsag Bailey Inc
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Filing: 1960-09-23
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Granted: 1965-04-06
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Expires: 1980-09-23
Abstract
No abstract record available.
Inventors
- 👤 Samuel G Dukelow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:39
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/0082; D; D21; D21C; D21C11/00; D21C11/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
137 words
IN A CONTROL SYSTEM FOR A MULTIPLE-EFFECT EVAPORATOR SYSTEM FOR THE CONCENTRATION OF THIN BLACK LIQUOR TO HEAVY BLACK LIQUOR COMPOSED OF SEVERAL EVAPORATORS ARRANGED IN CASCADE BY VAPOR PIPING IN WHICH THE WATER BOILED OFF THE LIQUOR IN ONE EVAPORATOR ACTS AS THE HEATING MEDIUM IN THE FOLLOWING EVAPORATOR AND ARRANGED TO ADMIT STEAM AS THE HEATING MEDIUM TO THE FIRST EVAPORATOR AND TO ADMIT THIN BLACK LIQUOR TO THE LAST EVAPORATOR WHEREBY THE BLACK LIQUOR AND HEATING MEDIUM PASS THROUGH THE SYSTEM IN CONTRA FLOW REACTION AND WHEREIN THE LIQUOR IS DIVERTED THROUGH A SOAP SEPARATION TANK IN PASSING FROM ONE EVAPORATOR TO ANOTHER, THE COMBINATION COMPRISING CONTROL MEANS MAINTAINING A CONSTANT RATE OF FLOW OF THE STEAM ADMITTED TO THE FIRST EVAPORATOR HAVING AN ADJUSTABLE SET POINT, MEANS RESPONSIVE TO THE FLOW OF LIQUOR
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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) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |