US3583033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valving die for in-line extrusion of thermoplastic material
Assignee: Pennwalt Corp
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Filing: 1969-01-22
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Granted: 1971-06-08
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Expires: 1989-01-22
Abstract
Abstract A DIE FOR IN-LINE EXTRUSION OF VISCOELASTIC AND VISCOUS THERMOPLASTIC MATERIALS. THE DIE INCLUDES A CONICAL MALE VALVE MEMBER WHICH IS ADVANCED OR RETRACTED WITH RESPECT TO A CONICAL SEAT TO VARY THE DEGREE OF SHEAR AND BACK PRESSURE TO WHICH THEMATERIAL IS EXPOSED IN PASSING THROUGH THE ANNULAR CONICAL PASSAGEWAY. HIGH INVENTORY ZONES ARE DISPOSED DOWNSTREAM OF THE SPIDER FOR SUPPORTING THE VALVE MEMBER AND ALLOWS FOR RELAXATION OF THE MATERIAL. HEAT MAY BE PERIPHERALLY OR CENTRALLY INCORPORATED AND AIR INTRODUCED FOR BLOW FORMING.
Inventors
- 👤 Alkis Christofas
- 👤 Andrew Anthony Dukert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:45
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/03; B29C48/06; B29C48/09; B29C48/10; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92514; B29C2948/92523; B29C2948/92571; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92904; B29C48/05; B29C48/07; B29C48/08
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |