US3568490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for heat forming elongated metal panels
Assignee: Fairchild Hiller Corp
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Filing: 1968-09-27
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Granted: 1971-03-09
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Expires: 1988-09-27
Abstract
Abstract A METHOD OF STRETCH FORMING METAL PARTS BY THE PASSAGE OF A HEAT ZONE ALONG A PART HELD IN TENSION AGAINST A DIE SURFACE. THE ENDS OF THE PART OT BE FORMED ARE HELD AND A TENSILE LOAD IS APPLIED HOLDING THE PART IN CONTACT WITH A DIE SURFACE WHILE A MOVABLE HEAT SOURCE TRAVERSES THE PART, LOCALLY YIELDING AID FORMING IT TO THE DIE CONFIGURATION. ELONGATION OF THE PART IS CONTROLLED AS A FUNCTION OF THE POSITION OF THE HEAT ZONE PERMITTING THE FORMING OF PARTS OF BOTH UNIFORM AND NONUNIFORM CROSS SECTION.
Inventors
- 👤 George A Bohmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:18
CPC Classifications
B; B21; B21D; B21D11/00; B21D11/02
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 |