US2584700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of iron ore containing impurities, including nickel and chromium
Assignee: Bethlehem Steel Corp
•
Filing: 1948-08-24
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Granted: 1952-02-05
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Expires: 1968-08-24
Abstract
No abstract record available.
Inventors
- 👤 Carle R Hayward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:37
CPC Classifications
C; C22; C22B; C22B3/00; C22B1/00; C22B1/02; C22B1/14; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
43 words
THE METHOD OF SEPARATING CHROMIUM FROM IRON IN AN IRON SULFATE SOLUTION CONTAINING A SMALL AMOUNT OF CHROMIUM WHICH COMPRISES ADDING METALLIC IRON OF SAID SULFATE SOLUTION TO FROM A PRECIPITATE CONTAINING CHROMIUM VALUES, THEN SEPARATING THE SAID PRECIPITATE FROM THE REMAINING SOLUTION.
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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) | 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 |