US3568491A
Expired / Lapsed
US
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Low-temperature stress-relieving process
Assignee: Boeing North American Inc
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Filing: 1969-05-23
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Granted: 1971-03-09
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Expires: 1989-05-23
Abstract
Abstract A METHOD OF MANUFACTURING A STRESS-RELIEVED ALUMINUM ALLOY FORGING USING THE FINISH IMPRESSION CAVITY OF CLOSED DIE APPARATUS FOR BOTH HOT-FORMING AND STRESS-RELIEVING OPERATIONS AND WITH INTERMEDIATE PROCESSING STEPS ALSO BEING INVOLVED.
Inventors
- 👤 Ralph C Bruner
- 👤 James W Ramsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:30
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/04; Y; Y10; Y10S; Y10S72/00; Y10S72/70
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |