US2776207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of iron ores
Assignee: Bethlehem Steel Corp
•
Filing: 1951-04-05
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Granted: 1957-01-01
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Expires: 1971-04-05
Abstract
No abstract record available.
Inventors
- 👤 Edgar B Mancke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:39
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0407; C22B23/0415; C22B23/043; C22B3/00; C22B3/04; C22B3/06; C22B3/08; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
A METHOD OF TREATING A SOLUTION CONTAINING IRON AND CHROMIUM SULFATES WHICH COMPRISES OXIDIZING THE SOLUTION TO CONVERT A SUBSTANTIAL PART OF THE CHROMIUM TO THE HEXAVALENT STATE, AUTOCLAVING THE OXIDIZED SOLUTION AT A TEMPERATURE OF NOT LESS THAN ABOUT 390*F. TO PRECIPATE AN IRON COMPOUND HAVING AN IRON TO CHROMIUM RATIO CONSIDERABLY HIGHER THAN THE IRON TO CHROMIUM RATIO OF SAID 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) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |