US3752712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron copper prealloys
Assignee: Domtar Inc
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Filing: 1971-06-07
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Granted: 1973-08-14
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Expires: 1991-06-07
Abstract
Abstract A PREALLOYED IRON-COPPER POWDER WHICH HAS HIGH COMPRESSIBLIITY AND SHRINKS UPON SINTERING IS PREPARED BY MELTING A CHARGE OF IRON AND COPPER, ATOMIZING THE CHARGE WITH WATER JETS UNDER PRESSURE, FURTHER COMMINUTING THE PARTICLES IF DESIRED, AND SUBJECTING THE FORMED POWDER TO A HEAT TREATMENT BETWEEN 1400*F. AND 1800*F. IN A REDUCING ATMOSPHERE FOLLOWED BY A CONTROLLED COOLING.
Inventors
- 👤 R Holcomb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:14
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/082; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; B22F2009/0824; B22F2009/0828
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |