US2724669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bending metal parts
Assignee: North American Aviation Corp
•
Filing: 1953-12-14
•
Granted: 1955-11-22
•
Expires: 1973-12-14
Abstract
No abstract record available.
Inventors
- 👤 Charles F Quirolo
- 👤 William F Thurber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:02
CPC Classifications
B; B21; B21D; B21D11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF PROVIDING A CONTOURED PART COMPRISING THE STEPS OF HEATING AN UNFORMED METAL WORKPIECE SUFFICIENTLY TO LOWER THE ELASTIC LIMIT THEREOF WHILE SIMULTANEOUSLY MAINTAINING A SUBSTANTIALLY CONSTANT BENDING STRESS THEREIN SUFFICIENT TO IMPART A CURVATURE THERETO GREATER THAN THAT REQUIRED FOR A COMPLETED PART AND SUFFICIENT TO EXCEED THE ELASTIC LIMIT OF SAID WORKPIECE WHEN SO HEATED, COOLING SAID WORKPIECE, AND RELEASING SAID WORKPIECE WHEREBY SAID WORKPIECE SPRING BACK TO A PERMANENTLY IMPART CONTOUR.
Claim 2
Independent Claim
76 words
THE METHOD OF PROVIDING A CONTOURED PART COMPRISING THE STEPS OF HEATING AN UNFORMED METAL WORKPIECE SUFFICIENTLY TO LOWER THE ELASTIC LIMIT THEREOF WHILE SIMULTANEOUSLY MAINTAINING A SUBSTANTIALLY CONSTANT BENDING STRESS THEREIN SUFFICIENT TO IMPART A CURVATURE THERETO GREATER THAN THAT REQUIRED FOR A COMPLETED PART AND SUFFICIENT TO EXCEED THE ELASTIC LIMIT OF SAID WORKPIECE WHEN SO HEATED, COOLING SAID WORKPIECE, AND RELEASING SAID WORKPIECE WHEREBY SAID WORKPIECE SPRING BACK TO A PERMANENTLY IMPART CONTOUR.
References Cited (Backward Citations)
US2449428A
Cited
US2527983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-21 | 1959-05-23 | 1959-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-21 | 1963-05-23 | 1963-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-21 | 1967-05-23 | 1967-11-22 | $7700.00 | Window Closed / Lapsed |