US2639810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion of metal billets having a temperature gradient
Assignee: Dow Chemical Co
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Filing: 1947-04-10
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Granted: 1953-05-26
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Expires: 1967-04-10
Abstract
No abstract record available.
Inventors
- 👤 Jack P Doan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:57
CPC Classifications
B; B21; B21C; B21C29/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN HOT-EXTRUDING METAL BILLETS IN AN EXTRUSION PRESS HAVING A CYLINDER, DIE , AND RAM, THE IMPROVEMENT WHICH COMPRISES PRETREATING EACH BILLET TO ESTABLISH WITHIN IT A TEMPERATURE GRADIENT SUCH THAT ONE ENTIRE END OF THE BILLET IS AT A HOT-WORKING TEMPERATURE AND THE OTHER ENTIRE END OF THE BILLET IS AT A TEMPERATURE BELOW THE MINIMUM HOT-WORKING TEMPERATURE, AND WHILE SUCH GRADIENT PERSISTS INSERTING THE BILLET IN THE PRESS CYLINDER WITH THE HOTTER END TOWARD THE DIE
Claim 2
Dependent Claim
78 words
IN HOT-EXTRUDING METAL BILLETS IN AN EXTRUSION PRESS HAVING A CYLINDER, DIE , AND RAM, THE IMPROVEMENT WHICH COMPRISES PRETREATING EACH BILLET TO ESTABLISH WITHIN IT A TEMPERATURE GRADIENT SUCH THAT ONE ENTIRE END OF THE BILLET IS AT A HOT-WORKING TEMPERATURE AND THE OTHER ENTIRE END OF THE BILLET IS AT A TEMPERATURE BELOW THE MINIMUM HOT-WORKING TEMPERATURE, AND WHILE SUCH GRADIENT PERSISTS INSERTING THE BILLET IN THE PRESS CYLINDER WITH THE HOTTER END TOWARD THE DIE
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 |