US3553996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion of brittle materials
Assignee: Battelle Development Corp
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Filing: 1967-11-13
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Granted: 1971-01-12
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Expires: 1987-11-13
Abstract
Abstract A METHOD OF EXTRUDING BRITTLE MATERIALS WHICH COMPRISES FORCING A BILLET OF BRITTLE MATERIAL THROUGH A DIE HAVING A RELIEF PORTION AT ITS EXIT END WHICH TAPERS LATERALLY OUTWARD AT A VERY SMALL ANGLE TO APPLY AN ABNORMALLY HIGH RADIAL COMPRESSIVE STRESS ON THE EXITING EXTRUSION. THE DIE MAY ALTERNATELY BE FORMED HAVING AWO COAXIAL LAND PORTIONS WITH THE LAND PORTION AT THE EXIT END OF THE DIE APPLYING A LONGITUDINAL COMPRESSIVE STRESS ON THE OUTER FIBERS ONLY OF THE LENGTH OF EXTRUSION BETWEEN LAND PORTIONS.
Inventors
- 👤 Alvin M Sabroff
- 👤 Robert J Fiorentino
- 👤 Barry D Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:52
CPC Classifications
B; B21; B21C; B21C25/00; B21C25/02; Y; Y10; Y10S; Y10S72/00; Y10S72/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |