US3271986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion apparatus and method
Assignee: Baldwin Lima Hamilton Corp
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Filing: 1964-12-09
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Granted: 1966-09-13
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Expires: 1984-12-09
Abstract
No abstract record available.
Inventors
- 👤 Walter H Stulen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:32
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
THE METHOD OF EXTRUDING HOLLOW METAL SHAPES THROUGH A DIE HAVING AN EXTRUSION ORIFICE WHICH COMPRISES PROVIDING A METAL BILLET, CONFINING THE BILLET, PIERCING THE BILLET, SUBJECTING THE BILLET TO FORCES APPLIED IN A DIRECTION TO FLOW THE METAL OF THE BILLET THROUGH SAID EXTRUSION ORIFICE, RENDERING THE INNER PERIPHERY OF THE FLOWING METAL FREE OF LATERALLY RESTRICTIVE FORCES IN A GIVEN ZONE IN COMMUNICATION WITH SAID METAL, PROVIDING A SOURCE OF A FLOWABLE MEDIUM AT A PRESSURE SUBSTANTIALLY BELOW AND UNRELATED TO THE PRESSURE OF THE FLOWING METAL, AND INTRODUCING SAID MEDIUM INTO SAID ZONE TO FORM AT LEAST A SURFACE LAYER OF THE FLOWING METAL WITH SAID MEDIUM.
Claim 2
Independent Claim
110 words
THE METHOD OF EXTRUDING HOLLOW METAL SHAPES THROUGH A DIE HAVING AN EXTRUSION ORIFICE WHICH COMPRISES PROVIDING A METAL BILLET, CONFINING THE BILLET, PIERCING THE BILLET, SUBJECTING THE BILLET TO FORCES APPLIED IN A DIRECTION TO FLOW THE METAL OF THE BILLET THROUGH SAID EXTRUSION ORIFICE, RENDERING THE INNER PERIPHERY OF THE FLOWING METAL FREE OF LATERALLY RESTRICTIVE FORCES IN A GIVEN ZONE IN COMMUNICATION WITH SAID METAL, PROVIDING A SOURCE OF A FLOWABLE MEDIUM AT A PRESSURE SUBSTANTIALLY BELOW AND UNRELATED TO THE PRESSURE OF THE FLOWING METAL, AND INTRODUCING SAID MEDIUM INTO SAID ZONE TO FORM AT LEAST A SURFACE LAYER OF THE FLOWING METAL WITH SAID MEDIUM.
References Cited (Backward Citations)
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Cited
US1331169A
Cited
US2258930A
Cited
US2887224A
Cited
US2907454A
Cited
US2962164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |