US2798802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the treatment of waste ferrous sulfate liquors
Assignee: Chemical Construction Corp
•
Filing: 1954-05-27
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Granted: 1957-07-09
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Expires: 1974-05-27
Abstract
No abstract record available.
Inventors
- 👤 Roy Tuhin Kumar
- 👤 Jr Louis N Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:13
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; Y; Y10; Y10S; Y10S423/00; Y10S423/01; Y10S423/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A METHOD FOR THE TREATMENT OF WASTE FERROUS SULFATE LIQUORS CONTAINING FERROUS SULFATE AND SULFURIC ACID WHICH COMPRISES NEUTRALIZING SAID LIQUORS WITH LIME, HEATING AN AQUEOUS SLURRY OF THE RESULTING PRECIPITATE WITH CARBON DIOXIDE AND AMMONIA AND THEREBY CONVERTING ITS CALCIUM SULFATE CONTENT TO CALCIUM CARBONATE AND SIMULTANEOUSLY FORMING AMMONIUM SULFATE IN SOLUTION, SEPARATING AND DRYING THE RESULTING MIXTURE OF CALCIUM CARBONATE AND IRON HYDROXIDE
Claim 2
Independent Claim
65 words
A METHOD FOR THE TREATMENT OF WASTE FERROUS SULFATE LIQUORS CONTAINING FERROUS SULFATE AND SULFURIC ACID WHICH COMPRISES NEUTRALIZING SAID LIQUORS WITH LIME, HEATING AN AQUEOUS SLURRY OF THE RESULTING PRECIPITATE WITH CARBON DIOXIDE AND AMMONIA AND THEREBY CONVERTING ITS CALCIUM SULFATE CONTENT TO CALCIUM CARBONATE AND SIMULTANEOUSLY FORMING AMMONIUM SULFATE IN SOLUTION, SEPARATING AND DRYING THE RESULTING MIXTURE OF CALCIUM CARBONATE AND IRON HYDROXIDE
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |