US3570062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Midstream radial valve for in-line extrusion of viscous thermoplastics
Assignee: Pennwalt Corp
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Filing: 1969-02-14
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Granted: 1971-03-16
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Expires: 1989-02-14
Abstract
Abstract AN IN-LINE VALVING DIE FOR EXTRUDING VISCOUS THERMOPLASTICS. OUTWARDLY DIVERGING SEMI-CIRCULAR CHANNELS FIRST DIRECT THE MATERIAL FROM THE EXTRUDER IN A CONTINUOUS STREAM OF SHEET-LIKE CONFIGURATION, WHICH IS DEPOSITED IN A HIGH-INVENTORY, ANNULAR CAVITY. THE MATERIAL THEN PASSES RADIALLY INWARD THROUGH AN ADJUSABLE DISK VALVE INTO A CENTRALLY DISPOSED RELATION RESERVOIR TO ALLOW FOR RECOVERY FROM THE UNIFORM SHEARING ACTION OF THE VALVE PRIOR TO FINAL SHAPING IN THE FORMING DIE. ALL INCREMENTS OF THE MATERIAL ADVANCE WITH EQUAL BACK PRESSURE TO DELIVER WELL CONVERTED MELTS WITHOUT SURFACE DEFECTS OR INTERNAL STRESSES.
Inventors
- 👤 Andrew Anthony Dukert
- 👤 Alkis Christofas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:12
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/03; B29C48/09; B29C48/10; B29C48/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |