Patent US3121255A successfully refreshed from Google Patents.
US3121255A
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Apparatus for extruding plastic compounds
Assignee: AT&T Inc
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Filing: 1960-11-18
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Granted: 1964-02-18
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Expires: 1980-11-18
Abstract
No abstract record available.
Inventors
- 👤 George E Henning
- 👤 Melvin W Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:29
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; B; B29; B29C; B29C48/00; B29C48/03; B29C48/06; B29C48/25; B29C48/27; B29C48/272; B29C48/30; B29C48/304; B29C48/32; B29C48/34; B29K; B29K2105/00; B29K2105/06; B29K2105/20; B29L; B29L2031/00; B29L2031/34; B29L2031/3462
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
IN AN EXTRUSION APPARATUS FOR EXTRUDING SIMULTANEOUSLY TWO DIFFERENT LAYERS OF PLASTIC COMPOUND ON A CORE, AN EXTRUSION HEAD MEANS HAVING A COMMON EXTRUSION PASSAGE THROUGH WHICH THE CORE IS PASSED, EXTRUSION TOOLS MOUNTED IN SAID EXTRUSION PASSAGE FOR FORMING THE PLASTIC COMPOUNDS INTO TWO DIFFERENT LAYERS ON THE CORE, TWO SEPERATE EXTRUSION CYLINDERS HAVING THE RESPECTIVE EXIT ENDS THEREOF SECURED TO THE EXTRUSION HEAD, AND MEANS FOR SUPPORTING THE EXTRUSION CYLINDERS FOR FREE AXIAL MOVEMENT UNDER THE INFLUENCE OF THERMAL EXPANSION AND CONTRACTION ENCOUNTERED DURING OPERATION OF THE EXTRUDING HEAD SO AS TO MAINTAIN THE LONGITUDINAL AXIS OF THE EXTRUDING HEAD COINCIDENT WITH THE LONGITUDINAL AXIS OF THE CORE.
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) | 1967-02-17 | 1967-08-19 | 1968-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-17 | 1971-08-19 | 1972-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-17 | 1975-08-19 | 1976-02-18 | $7700.00 | Window Closed / Lapsed |