US2759513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for stretch bending metal members
Assignee: Individual
•
Filing: 1952-08-20
•
Granted: 1956-08-21
•
Expires: 1972-08-20
Abstract
No abstract record available.
Inventors
- 👤 Lee B Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:58
CPC Classifications
B; B21; B21D; B21D11/00; B21D11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE METHOD OF STRETCH BENDING A METAL WORKPIECE WHICH COMPRISES, APPLYING A STRETCHING FORCE TO OPPOSITE ENDS OF THE WORKPIECE AND SIMULTANEOUSLY BENDING THE WORKPIECE AROUND A CONVEXLY CURVED DIE, SAID SIMULTANEOUS STRETCHING AND BENDING BEING ACCOMPLISHED BY FORCING SAID DIE AGAINST AN INTERMEDIATE PORTION OF THE WORKPIECE AND SIMULTANEOUSLY STRETCHINGLY PULLING SAID OPPOSITE ENDS AROUND CURVED PORTIONS OF THE DIE, PROGRESSIVELY CHANGING THE DIRECTION OF APPLICATION OF THE STRETCHING FORCE SUCH THAT THE END PORTION OF THE WORKPIECE ARE AL-
Claim 2
Independent Claim
81 words
THE METHOD OF STRETCH BENDING A METAL WORKPIECE WHICH COMPRISES, APPLYING A STRETCHING FORCE TO OPPOSITE ENDS OF THE WORKPIECE AND SIMULTANEOUSLY BENDING THE WORKPIECE AROUND A CONVEXLY CURVED DIE, SAID SIMULTANEOUS STRETCHING AND BENDING BEING ACCOMPLISHED BY FORCING SAID DIE AGAINST AN INTERMEDIATE PORTION OF THE WORKPIECE AND SIMULTANEOUSLY STRETCHINGLY PULLING SAID OPPOSITE ENDS AROUND CURVED PORTIONS OF THE DIE, PROGRESSIVELY CHANGING THE DIRECTION OF APPLICATION OF THE STRETCHING FORCE SUCH THAT THE END PORTION OF THE WORKPIECE ARE AL-
References Cited (Backward Citations)
DE621397C
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US2129774A
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US2269549A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |