US2717829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ore preparation
Assignee: Bethlehem Steel Corp
•
Filing: 1950-10-17
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Granted: 1955-09-13
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Expires: 1970-10-17
Abstract
No abstract record available.
Inventors
- 👤 Robert S A Dougherty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:30
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0407; C22B23/0446
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A METHOD OF TREATING A FERROUS ORE CONTAINING NICKEL IN EXCESS OF 0.25 PER CENT TO REMOVE NICKEL THEREFROM, WHICH COMPRISES REDUCING SAID ORE TO A POINT AT WHICH SUBSTANTIALLY ALL OF THE NICKEL HAS BEEN REDUCED TO ELEMENTAL METAL, THEN TREATING SAID ORE IN THE PRESENCE OF AN AQUEOUS AMMONIUM CARBONATE SOLUTION AND AMMONINA GAS AT A PRESSURE OF AT LEAST 175 POUNDS PER SQUARE INCH AND AT A TEMPERATURE OF AT LEAST 250* F.
Claim 2
Independent Claim
76 words
A METHOD OF TREATING A FERROUS ORE CONTAINING NICKEL IN EXCESS OF 0.25 PER CENT TO REMOVE NICKEL THEREFROM, WHICH COMPRISES REDUCING SAID ORE TO A POINT AT WHICH SUBSTANTIALLY ALL OF THE NICKEL HAS BEEN REDUCED TO ELEMENTAL METAL, THEN TREATING SAID ORE IN THE PRESENCE OF AN AQUEOUS AMMONIUM CARBONATE SOLUTION AND AMMONINA GAS AT A PRESSURE OF AT LEAST 175 POUNDS PER SQUARE INCH AND AT A TEMPERATURE OF AT LEAST 250* F.
References Cited (Backward Citations)
US2531336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |