US2925337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing rolled steel products from fine grained iron material
Assignee: STORA KOPPARSBERG BERGSLAGS AB
•
Filing: 1955-03-21
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Granted: 1960-02-16
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Expires: 1975-03-21
Abstract
No abstract record available.
Inventors
- 👤 Kalling Bo Michael Sture
- 👤 Eketorp Sven Gustav Harald
- 👤 Johansson Folke Carl Evald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:14
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/18; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0235
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
METHOD FOR THE MANUFACTURE OF HOT ROLLED STEEL PRODUCTS DIRECTLY FROM PIG IRON WHICH COMPRISES MIXING PIG IRON HAVING A SILICON CONTENT OF NOT MORE THAN 0.1 PERCENT AND AN IRON OXIDE MATERIAL BOTH COMMINUTED TO A GRAIN SIZE SUBSTANTIALLY BELOW 1 MM. IN SUCH PROPORTIONS THAT THE OXYGEN CONTENT OF THE IRON OXIDE MATERIAL IS SUFFICIENT FOR REDUCING THE CARBON CONTENT OF THE PIG IRON TO A VALUE WHICH MAKES SAID IRON ROLLABLE SIMULTANEOUSLY WITH THE CONVERSION OF THE IRON OXIDE MATERIAL TO METAL, INTRODUCING SAID MIXTURE INTO A STEEL SHEET
Claim 2
Dependent Claim
92 words
METHOD FOR THE MANUFACTURE OF HOT ROLLED STEEL PRODUCTS DIRECTLY FROM PIG IRON WHICH COMPRISES MIXING PIG IRON HAVING A SILICON CONTENT OF NOT MORE THAN 0.1 PERCENT AND AN IRON OXIDE MATERIAL BOTH COMMINUTED TO A GRAIN SIZE SUBSTANTIALLY BELOW 1 MM. IN SUCH PROPORTIONS THAT THE OXYGEN CONTENT OF THE IRON OXIDE MATERIAL IS SUFFICIENT FOR REDUCING THE CARBON CONTENT OF THE PIG IRON TO A VALUE WHICH MAKES SAID IRON ROLLABLE SIMULTANEOUSLY WITH THE CONVERSION OF THE IRON OXIDE MATERIAL TO METAL, INTRODUCING SAID MIXTURE INTO A STEEL SHEET
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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) | 1963-02-15 | 1963-08-17 | 1964-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-15 | 1967-08-17 | 1968-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-15 | 1971-08-17 | 1972-02-16 | $7700.00 | Window Closed / Lapsed |