US3588987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion dies and method and apparatus for fabrication of extrusion dies
Assignee: Individual
•
Filing: 1970-03-11
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Granted: 1971-06-29
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Expires: 1990-03-11
Abstract
Abstract AN EXTRUSION DIE IS MADE BY STRETCHING A FLEXIBLE DIAPHRAGM HAVING ONE END HELD IN A SHAPE CONFORMING TO THE INPUT END OF THE DIE AND THE OTHER END MAINTAINED IN CONFORMITY WITH THE DESIRED PROFILE OF THE PART TO BE EXTRUDED. A FLUID HAVING HARDENING PROPERTIES IS APPLIED TO ONE SURFACE OF THE DISTENDED DIAPHRAGM. ONCE THE MATERIAL HAS HARDENED, THE FLEXIBLE DIAPHRAGM IS STRIPPED AWAY, AND THE RESULTANT, CONTOUR IS COATED WITH A MATERIAL TO FORM THE CONTOUR OF THE DIE. THIS CONTOUR IS CAST IN A SHELL, WITH APPROPRIATE HEAT AND HEAT SENSING ELEMENTS, TO FORM THE DIE.
Inventors
- 👤 Edward Korostoff
- 👤 Gary K Zin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:14
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/02; B29C33/56; B29C48/00; B29C48/03; B29C48/12; B29C48/25; B29C48/30; B29C48/3001; B29C48/3003; B29C48/78; B29C48/86; B29C48/865; Y; Y10; Y10S; Y10S29/00; Y10S29/029
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |