US3621704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bending apparatus
Assignee: INDUSTRIAL PLANTS Corp F/K/A DELTA INDUSTRIES Inc A CORP OF CT
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Filing: 1969-06-17
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Granted: 1971-11-23
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Expires: 1989-06-17
Abstract
Abstract APPARATUS FOR MAKING A PRODUCT, SUCH AS AN EXPANSION SHELL, FROM A STRIP OR METAL INCLUDES A STATION FOR SHEARING NOTCHES ALONG ONE SIDE OF THE STRIP TO FORM THE LEAVES OF A SHELL AND A STATION TO SHEAR A BLANK, INCLUDING A NUMBER OF THE LEAVES, FROM THE STRIP AND TO BEND THE BLANK ABOUT A MANDREL BY MEANS OF A PAIR OF PIVOTALLY MOUNTED DIES.
Inventors
- 👤 Charles W Schaeffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:42
CPC Classifications
B; B21; B21D; B21D5/00; B21D5/01; B21D35/00; B21D53/00; B21D53/36
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |