Extrusion die apparatus
Abstract
Abstract AN EXTRUSION DIE INCLUDING A MANDREL AND MEANS FOR RELATIVELY MOVING THE MANDREL AND THE DIE TO PRODUCE EXTRUSIONS OF DIFFERENT OR VARIABLE CROSS SECTIONS. IN ONE FORM, THE MANDREL IS LONGITUDINALLY MOVABLE IN THE DIE AND HAS DIFFERENT PORTIONS OF DIFFERENT SHAPE WHICH, WHEN PREDETERMINATELY POSITIONED IN THE DIE OPENING, PRODUCE EXTRUSIONS OF DIFFERENT SHAPES. IN ANOTHER FORM, THE MANDREL HEAD TAPERS OUTWARDLY AND IS LONGITUDINALLY MOVABLE WITHIN THE DIE TO PERMIT VARYING THE WALL THICKNESS OF A TUBULAR EXTRUSION AND, IN CERTAIN INSTANCES, THE COMPLETELY STOP THE FLOW OF EXTRUSION MATERIAL SO AS TO EFFECT THE CUTOFF OF EXTRUSIONS. THE APPARATUS IS ALSO OPERATIVE TO PROVIDE EXTRUSIONS WITH OPENINGS THEREIN AND EXTRUSIONS HAVING RAISED AND RECESSED PORTIONS.
Inventors
- 👤 Jerome H Lemelson
Bibliographic Details
Claims Analysis
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |