Patent US3563813A successfully refreshed from Google Patents.
US3563813A
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US
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Controlling fracture toughness of high-strength stainless steels
Assignee: Boeing Co
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Filing: 1968-12-20
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Granted: 1971-02-16
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Expires: 1988-12-20
Abstract
Abstract A METHOD OF CONTROLLING FRACTURE TOUGHNESS IN HIGHSTRENGTH STAINLESS STEELS BY HEAT TREATING PROCEDURES. THE HEAT TREATED ALLOY RETAINS A CONTROLLED AMOUNT OF AUSTENITE WHICH IMPARTS FRACTURE TOUGHNESS ALONG WITH A MINOR INCREASE IN STRENGTH.
Inventors
- 👤 Donald Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:48
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/30; C21; C21D; C21D8/00
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |