Patent US2584280A successfully refreshed from Google Patents.
US2584280A
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Method of preparing substantially iron-free ammonium sulfate from spent pickle liquor
Assignee: Republic Steel Corp
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Filing: 1947-01-09
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Granted: 1952-02-05
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Expires: 1967-01-09
Abstract
No abstract record available.
Inventors
- 👤 Herman P Meissner
- 👤 Richard W Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:06
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/24; C01C1/244; Y; Y10; Y10S; Y10S423/00; Y10S423/01; Y10S423/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
THE METHOD OF PREPARING SUBSTANTIALLY IRONFREE AMMONIUM SULFATE FROM A SPENT PICKLE LIQUOR WHICH COMPRISES THE STEPS OF CONTACTING SAID LIQUOR WITH A CRUDE COKE OVEN GAS CONTAINING AMMONIA TO ELEVATE AND MAINTAIN THE PH OF SAID LIQUOR BETWEEN ABOUT 8.1 AND 8.5 AND THEREBY CONVERTING THE SAID LIQUOR INTO A BLACK SLURRY CONTAINING PRECIPITATED FERROUS IRON COMPOUNDS, SEPARATING THE SOLID PHASE FROM THE LIQUID PHASE WHICH CONSISTS ESSENTIALLY OF AMMONIUM SULFATE AND CONTAINS SUBSTANTIALLY NO DISSOLVED IRON, CONTACTING SAID LIQUID PHASE WITH AN OXIDIZING GAS AND OXIDIZING ANY RESIDUAL DISSOLVED IRON, AND SEPARATING THE AMMONIUM SULFATE FROM THE RESULTING PRECIPITATE OF OXIDIZED IRON.
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) | 1955-02-04 | 1955-08-06 | 1956-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-04 | 1959-08-06 | 1960-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-04 | 1963-08-06 | 1964-02-05 | $7700.00 | Window Closed / Lapsed |