US2884349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of calcium sulfate scale
Assignee: Freeport Minerals Co
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Filing: 1956-07-19
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Granted: 1959-04-28
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Expires: 1976-07-19
Abstract
No abstract record available.
Inventors
- 👤 Bernard A Axelrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:05
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C02; C02F; C02F5/00; C02F5/08; C02F5/083; Y; Y10; Y10S; Y10S159/00; Y10S159/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A PROCESS FOR THE REMOVAL OF CALCIUM SULFATE SCALE FROM HEAT EXCHANGE WHICH COMPRISES, DISSOLVING SAID SCALE IN A CONTINUOUSLY FLOWING STREAM OF AN AQUEOUS SOLUTION OF SODIUM CHLORIDE OF A CONCENTRATION OF A MAGNITUDE WHICH INCREASES THE SOLUBILITY OF THE CALCIUM SULFATE IN THE SOLUTION TO A LEVEL WHICH ACCOMPLISHES DISSOLUTION OF THE SCALE AT AN ECONOMICALLY FEASIBLE RATE.
Claim 2
Dependent Claim
60 words
A PROCESS FOR THE REMOVAL OF CALCIUM SULFATE SCALE FROM HEAT EXCHANGE WHICH COMPRISES, DISSOLVING SAID SCALE IN A CONTINUOUSLY FLOWING STREAM OF AN AQUEOUS SOLUTION OF SODIUM CHLORIDE OF A CONCENTRATION OF A MAGNITUDE WHICH INCREASES THE SOLUBILITY OF THE CALCIUM SULFATE IN THE SOLUTION TO A LEVEL WHICH ACCOMPLISHES DISSOLUTION OF THE SCALE AT AN ECONOMICALLY FEASIBLE RATE.
References Cited (Backward Citations)
US2601364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |