US2728655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing iron powder with a low silica content
Assignee: Hoganas Billesholms AB
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Filing: 1952-01-21
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Granted: 1955-12-27
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Expires: 1972-01-21
Abstract
No abstract record available.
Inventors
- 👤 Brundin Nils Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:55
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A METHOD FOR THE PRODUCTION OF IRON POWDER WHICH COMPRISES MIXING IRON OXIDIC MATERIAL IN FINELY DIVIDED FORM WITH A SOLID, ASH-CONTAINING CARBONACEOUS REDUCING AGENT COMPRISING GRAINS OF A LARGER GRAIN SIZE THAN THE IRON OXIDIC MATERIAL AND WHICH IS SUBSTANTIALLY FREE OF PARTICLES OF A GRAIN SIZE BELOW ABOUT 80 MESH, HEATING THE MIXTURE TO A TEMPERATURE AND FOR A TIME SUFFICIENT TO COMPLETE THE REDUCTION OF THE IRON OXIDIC MATERIAL, SAID TEMPERATURE BEING BELOW THE MELTING POINT OF THE IRON FORMED BY THE REDUCTION, COOLING THE RESULTING SPONGE IRON, CRUSHING THE COOLED SPONGE IRON TO THE DESIRED GRAIN SIZE AND MAGNETICALLY SEPARATING THE IRON TO THE DESIRED GRAIN CRUSHED SPONGE.
Claim 2
Independent Claim
112 words
A METHOD FOR THE PRODUCTION OF IRON POWDER WHICH COMPRISES MIXING IRON OXIDIC MATERIAL IN FINELY DIVIDED FORM WITH A SOLID, ASH-CONTAINING CARBONACEOUS REDUCING AGENT COMPRISING GRAINS OF A LARGER GRAIN SIZE THAN THE IRON OXIDIC MATERIAL AND WHICH IS SUBSTANTIALLY FREE OF PARTICLES OF A GRAIN SIZE BELOW ABOUT 80 MESH, HEATING THE MIXTURE TO A TEMPERATURE AND FOR A TIME SUFFICIENT TO COMPLETE THE REDUCTION OF THE IRON OXIDIC MATERIAL, SAID TEMPERATURE BEING BELOW THE MELTING POINT OF THE IRON FORMED BY THE REDUCTION, COOLING THE RESULTING SPONGE IRON, CRUSHING THE COOLED SPONGE IRON TO THE DESIRED GRAIN SIZE AND MAGNETICALLY SEPARATING THE IRON TO THE DESIRED GRAIN CRUSHED SPONGE.
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) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |