US2774694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the descaling of sugar factory evaporators and other heat transfer equipment
Assignee: Individual
•
Filing: 1954-09-30
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Granted: 1956-12-18
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Expires: 1974-09-30
Abstract
No abstract record available.
Inventors
- 👤 Wiggins Leslie Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:01
CPC Classifications
C; C13; C13B; C13B30/00; C13B30/002; C13B30/005; C23; C23G; C23G1/00; C23G1/14; F; F28; F28G; F28G9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A PROCESS FOR THE DE-SCALING OF SUGAR FACTORY EVAPORATORS AND OTHER HEAT TRANSFER APPARATUS CONSISTING IN TREATING THE APPARATUS WITH A HOT ALKALINE SOLUTION OF A SEQUESTERING AGENT CONSISTING OF THE TETRA-SODIUM SALT OF ETHYLENE DIAMINE TETRA-ACETIC ACID, AND LATER RECOVERING THE SAID AGENT BY BRINGING THE PH VALUE OF THE SOLUTION TO ABOUT 2.5, REMOVING THE PRECIPITATE FROM THE SOLUTION, AND SUBSEQUENTLY MAKING THE SOLUTION ALKALINE TO ABOUT PH 11 WITH AN ALKALI METAL HYDORXIDE.
Claim 2
Dependent Claim
76 words
A PROCESS FOR THE DE-SCALING OF SUGAR FACTORY EVAPORATORS AND OTHER HEAT TRANSFER APPARATUS CONSISTING IN TREATING THE APPARATUS WITH A HOT ALKALINE SOLUTION OF A SEQUESTERING AGENT CONSISTING OF THE TETRA-SODIUM SALT OF ETHYLENE DIAMINE TETRA-ACETIC ACID, AND LATER RECOVERING THE SAID AGENT BY BRINGING THE PH VALUE OF THE SOLUTION TO ABOUT 2.5, REMOVING THE PRECIPITATE FROM THE SOLUTION, AND SUBSEQUENTLY MAKING THE SOLUTION ALKALINE TO ABOUT PH 11 WITH AN ALKALI METAL HYDORXIDE.
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) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |