US3574004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing of gas turbine engine shafting
Assignee: RTX Corp
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Filing: 1969-03-20
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Granted: 1971-04-06
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Expires: 1989-03-20
Abstract
Abstract BI-METAL GAS TURBINE ENGINE SHAFTNG , FORMED AT ONE END FROM A HIGH FATIGUE STRENGTH, CREEP LIMITED LOW ALLOY STEEL SUCH AS AMS 6340, AND AT THE OTHER END FROM A HIGH CREEP STRENGTH AGE-HARDENABLE NICKEL BASE ALLOY SUCH AS INCONE1 718, IS HEAT TREATED IN AN UNCONVENTIONAL CYCLE TO ATTAIN AND PRESERVE THE ADVANTAGEOUS MECHANICAL PROPERTIES AT BOTH ENDS OF THE SHAFTING.
Inventors
- 👤 John E Flynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:14
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; B32B15/013; B32B15/015; C; C21; C21D; C21D9/00; C21D9/28; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/056; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12937
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |