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US3740274A
Expired / Lapsed
US
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High post-irradiation ductility process
Assignee: United States Atomic Energy Commission
•
Filing: 1972-04-20
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Granted: 1973-06-19
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Expires: 1992-04-20
Abstract
Abstract A method of treating certain stainless steels to improve the ductility characteristics after irradiation at high temperatures involving working at room temperatures or lower to a 90 percent reduction of area followed by low temperature recrystallization annealing.
Inventors
- 👤 J Chow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:44
CPC Classifications
C; C21; C21D; C21D8/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
17 words
The process according to claim 1 in which working takes place up to a temperature of 300*F.
Claim 2
Dependent Claim
19 words
The process according to claim 2 in which the intermediate annealing temperature is in the range of 1200*-1500* F.
Claim 3
Dependent Claim
24 words
The process according to claim 3 in which final annealing takes place at a temperature in the range of 1200*-1500*F. until recrystallization takes place.
Claim 4
Dependent Claim
14 words
The process according to claim 4 in which the working temperature is room temperature.
Claim 5
Dependent Claim
15 words
The process according to claim 4 in which more than one intermediate annealing is employed.
Claim 6
Dependent Claim
31 words
The process according to claim 3 in which the final annealing is for a substantially longer period than the intermediate anneal to increase long term stabilization characteristics of the grain structure.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |