US3720511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of metal strip from powdered metal
Assignee: British Steel Corp
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Filing: 1970-03-17
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Granted: 1973-03-13
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Expires: 1990-03-17
Abstract
Abstract A PROCESS IS PROVIDED FOR ROLLING METAL STRIP, PARTICULARLY IRON OR IRON STRIP, DIRECTLY FROM POWDERED METAL UTILISING THE TECHNIQUE OF BATCH SINTERING A GREEN STRIP OR A PARTIALLY SINTERED STRIP IN COILED FORM IN A BATCH ANNEALING FURNACE AT RELATIVELY LOW TEMPERATURES. IN A PREFERRED EMBODIMENT A GREEN STRIP IS FORMED BY COMPACTING A LAYER FOUND FROM A METAL/BINDER COMPOSITION, PARTIALLY SINTERING THE GREEN STRIP BY PASSAGE THROUGH AN IN-LINE FURNACE, COILING THE PARTIALLY SINTERED STRIP AND SINTERING IT IN A BATCH ANNEALING FURNACE AT A TEMPERATURE SUBSTANTIALLY BELOW THAT OF THE IN-LINE FURNACE.
Inventors
- 👤 I Davies
- 👤 A Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:39
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/02; B22F7/04; B22F5/00; B22F5/006; B22F2998/00; B22F2998/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |