Patent US2735757A successfully refreshed from Google Patents.
US2735757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of iron powder
Assignee: —
•
Filing: —
•
Granted: 1956-02-21
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Expires: 1973-02-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:34
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A METHOD OF PRODUCING IRON POWDER, COMPRISING THE STEPS OF PREPARING AN AQUEOUS HALOID SALT SOLUTION CONTAINING IRON IONS, OXIDIZING SAID SOLUTION BY MEANS OF AIR SO AS TO PRECIPITATE IRON THEREFROM IN THE FORM OF A HYDRATE SLUDGE, SEPARATING SAID SLUDGE AND SAID SOLUTION, WASHING AND DRYING SAID SLUDGE AND THEREUPON REDUCING THE SAME TO IRON POWDER BY MEANS OF A GASEOUS REDUCING AGENT AND IN A PLURALITY OF STAGES, AT LEAST THE LAST ONE OF SAID STAGES BEING CARRIED OUT IN HYDROGEN, REGENERATING SAID SEPARATED SOLUTION AS TO ITS IRON CONTENT BY DISSOLVING IRON SCRAP THEREIN, AND THEREUPON AGAIN OXIDIZING SAID SOLUTION, SAID OXIDIZING AND REGENERATING STEPS FORMING A CYCLE OF OPERATIONS.
Claim 2
Independent Claim
114 words
A METHOD OF PRODUCING IRON POWDER, COMPRISING THE STEPS OF PREPARING AN AQUEOUS HALOID SALT SOLUTION CONTAINING IRON IONS, OXIDIZING SAID SOLUTION BY MEANS OF AIR SO AS TO PRECIPITATE IRON THEREFROM IN THE FORM OF A HYDRATE SLUDGE, SEPARATING SAID SLUDGE AND SAID SOLUTION, WASHING AND DRYING SAID SLUDGE AND THEREUPON REDUCING THE SAME TO IRON POWDER BY MEANS OF A GASEOUS REDUCING AGENT AND IN A PLURALITY OF STAGES, AT LEAST THE LAST ONE OF SAID STAGES BEING CARRIED OUT IN HYDROGEN, REGENERATING SAID SEPARATED SOLUTION AS TO ITS IRON CONTENT BY DISSOLVING IRON SCRAP THEREIN, AND THEREUPON AGAIN OXIDIZING SAID SOLUTION, SAID OXIDIZING AND REGENERATING STEPS FORMING A CYCLE OF OPERATIONS.
References Cited (Backward Citations)
US1829635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-20 | 1959-08-22 | 1960-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-20 | 1963-08-22 | 1964-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-20 | 1967-08-22 | 1968-02-21 | $7700.00 | Window Closed / Lapsed |