US3677830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing of the precipitation hardening nickel-base superalloys
Assignee: RTX Corp
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Filing: 1970-02-26
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Granted: 1972-07-18
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Expires: 1990-02-26
Abstract
Abstract AFTER WORKING AND PRIOR TO AGING, THE PRECIPITATION HARDENING NICKEL-BASE SUPERALLOYS ARE SUBJECTED TO A DUPLEX HEAT TREATMENT COMPRISING A FIRST HEAT TREATMENT AT A TEMPERATURE OF 25* -100*F. BELOW THE SECONDARY PHASE SOLVUS AND A SECOND HEAT TREATMENT IN THE TEMPERATURE RANGE OF 0-25*F. BELOW THE SECONDARY PHASE SOLVUS.
Inventors
- 👤 Arthur R Cox
- 👤 Marvin M Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:41
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/10
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |