US2639809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion of continuous metal articles
Assignee: Dow Chemical Co
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Filing: 1947-04-02
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Granted: 1953-05-26
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Expires: 1967-04-02
Abstract
No abstract record available.
Inventors
- 👤 Robert E Perry
- 👤 Ansel Gerhard
- 👤 Robert L Dietrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:12
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/02; B21C23/04; B21C23/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
IN THE HOT EXTRUSION OF MAGNESIUM-BASE ALLOY BILLETS TO FORM A CONTINUOUS PRODUCT IN A DIRECT-EXTRUSION PRESS HAVING A CYLINDER, RAM, AND DIE, THE STEPS OF: EXTRUDING EACH BILLET THROUGH A DIE OF SUFFICIENTLY RESTRICTED OPEN AREA THAT THE REDUCTION IN CROSS-SECTIONAL ARAS DURING EXTRUSION IS AT LEAST 75:1, FORMING THE REAR END OF EACH BILLET TO A CONVEX SHAPE DURING EXTRUSION THEREOF BY APPLYING THE EXTRUSION PRES-SURE THERETO BY MEANS OF CONCAVE-ENDED RAM, TERMINATING EACH EXTRUSION STROKE WHEN THE
Claim 2
Dependent Claim
80 words
IN THE HOT EXTRUSION OF MAGNESIUM-BASE ALLOY BILLETS TO FORM A CONTINUOUS PRODUCT IN A DIRECT-EXTRUSION PRESS HAVING A CYLINDER, RAM, AND DIE, THE STEPS OF: EXTRUDING EACH BILLET THROUGH A DIE OF SUFFICIENTLY RESTRICTED OPEN AREA THAT THE REDUCTION IN CROSS-SECTIONAL ARAS DURING EXTRUSION IS AT LEAST 75:1, FORMING THE REAR END OF EACH BILLET TO A CONVEX SHAPE DURING EXTRUSION THEREOF BY APPLYING THE EXTRUSION PRES-SURE THERETO BY MEANS OF CONCAVE-ENDED RAM, TERMINATING EACH EXTRUSION STROKE WHEN THE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |