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US3759709A
Expired / Lapsed
US
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Method for producing porous metal products
Assignee: United States Atomic Energy Commission
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Filing: 1970-04-28
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Granted: 1973-09-18
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Expires: 1990-04-28
Abstract
Abstract POROUS METAL PRODUCTS HAVING WALL THICKNESSES OF ABOUT 1.0 TO ABOUT 6.0 INCHES AND POROSITIES IN THE RANGE OF ABOUT 20 TO 70 PERCENT WITH INTERCONNECTING PORES ARE PREPARED BY FILLING A RECEPTACLE WITH FINE METAL POWDER, HEATING THE METAL TO A TEMPERATURE SLIGHTLY BELOW THE SINTERING TEMPERATURE OF THE METAL, MAINTAINING THE LOWER TEMPERATURE FOR A DURATION SUFFICIENT TO PROVIDE A TEMPERATURE EQUILIBRIUM THROUGHOUT THE POWDER, INCREASING THE TEMPERATURE OF THE METAL TO THE SINTERING TEMPERATURE THEREOF, AND IMMEDIATELY THEREAFTER DECREASING THE TEMPERATURE TO INHIBIT FURTHER SINTERING.
Inventors
- 👤 J Asbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:37
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; 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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |