US2497667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-treatment of nickel-chromium alloys
Assignee: Rolls Royce PLC
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Filing: 1947-02-04
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Granted: 1950-02-14
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Expires: 1967-02-04
Abstract
No abstract record available.
Inventors
- 👤 Gresham Harold Ernest
- 👤 Hall Douglas Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:19
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/058
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
IN THE PROCESSING OF NICKEL-CHROMIUM BASE ALLOYS CONTAINING A HARDENING ELEMENT AND CAPABLE OF BEING HARDENED BY PRECIPITATION HEAT TREATMENT, THE STEP OF SUBJECTING THE ALLOY TO A TWOSTAGE THAT TREATMENT BY FIRST HEATING IT DURING SEVERAL HOURS AT 650 TO 895*C. AND THEREAFTER SUBJECTING IT DURING 8 TO 30 HOURS TO SOAKING AT 1020 TO 1100*C., THEN COOLING AND FINALLY AGEING AT 650 TO 850*C.
Claim 2
Dependent Claim
66 words
IN THE PROCESSING OF NICKEL-CHROMIUM BASE ALLOYS CONTAINING A HARDENING ELEMENT AND CAPABLE OF BEING HARDENED BY PRECIPITATION HEAT TREATMENT, THE STEP OF SUBJECTING THE ALLOY TO A TWOSTAGE THAT TREATMENT BY FIRST HEATING IT DURING SEVERAL HOURS AT 650 TO 895*C. AND THEREAFTER SUBJECTING IT DURING 8 TO 30 HOURS TO SOAKING AT 1020 TO 1100*C., THEN COOLING AND FINALLY AGEING AT 650 TO 850*C.
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) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |