Patent US3893844A successfully refreshed from Google Patents.
US3893844A
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Dispersion strengthened metals
Assignee: SCM Metal Products Inc
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Filing: 1973-07-30
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Granted: 1975-07-08
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Expires: 1993-07-30
Abstract
Abstract A dispersion-strengthened metal wherein the improvement comprises recrystallizing alloy powder prior to internal oxidation to increase the grain size of the alloy to at least about ASTM (E-112) Grain Size No. 6 to reduce the grain boundary area in the alloy powder whereby the recrystallized alloy powder provides substantially improved structural properties in the dispersion-strengthened metal product.
Inventors
- 👤 Anil V Nadkarni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:07
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
AN IMPROVED POWDERD ALLOY SUITABLE FOR DISPERSION STRENGTHENING BY INTERNAL OXIDATION, COMPRISING: AN ALLOY COMPRISING A RELATIVELY NOBLE MATRIX METAL HAVING A NEGATIVE FREE ENERGY OF OXIDE FORMATION AT 25*C OF UP TO 70 KILOCALORIES PER GRAM ATOM OF OXYGEN AND A SOLUTE METAL HAVING A NEGATIVE FREE ENERGY OF OXIDE FORMATION EXCEEDING THE FREE ENERGY OF OXIDE FORMATION NOBLE MATRIX METAL BY AT LEAST ABOUT 60 KILOCALORIES PER GRAM ATOM OF OXYGEN AT 25*C, AND SAID POWDERED ALLOY BEING RECRYSTALLIZED AND HAVING A GRAIN SIZE OF AT LEAST BUMBER 6 AS MEASURED BY ASTME - 112.
Claim 2
Dependent Claim
97 words
AN IMPROVED POWDERD ALLOY SUITABLE FOR DISPERSION STRENGTHENING BY INTERNAL OXIDATION, COMPRISING: AN ALLOY COMPRISING A RELATIVELY NOBLE MATRIX METAL HAVING A NEGATIVE FREE ENERGY OF OXIDE FORMATION AT 25*C OF UP TO 70 KILOCALORIES PER GRAM ATOM OF OXYGEN AND A SOLUTE METAL HAVING A NEGATIVE FREE ENERGY OF OXIDE FORMATION EXCEEDING THE FREE ENERGY OF OXIDE FORMATION NOBLE MATRIX METAL BY AT LEAST ABOUT 60 KILOCALORIES PER GRAM ATOM OF OXYGEN AT 25*C, AND SAID POWDERED ALLOY BEING RECRYSTALLIZED AND HAVING A GRAIN SIZE OF AT LEAST BUMBER 6 AS MEASURED BY ASTME - 112.
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |