Patent US3071809A successfully refreshed from Google Patents.
US3071809A
Expired / Lapsed
US
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Methods of and apparatus for extruding plastic materials
Assignee: AT&T Inc
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Filing: 1960-05-09
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Granted: 1963-01-08
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Expires: 1980-05-09
Abstract
No abstract record available.
Inventors
- 👤 Brooke W Lerch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:51
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/34; B29C48/03; B29C48/06; B29C48/14; B29C48/15; B29C48/05
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
APPARATUS FOR EXTRUDING PLASTIC MATERIALS, WHICH COMPRISES AN EXTRUSION HEAD HAVING A LONGITUDINALLY EXTENDING EXTRUSION PASSAGE FORMED THEREIN, A FORMING DIE MOUNTED AT THE EXIT END OF THE EXTRUSION PASSAGE, A CORE TUBE POSITIONED ADJACENT TO THE FORMING DIE AND MOUNTED RECIPROCABLY WITH RESPECT THERETO, AND MEANS FOR RECIPROCATING THE CORE TUBE AXIALLY WITH RESPECT TO THE FORMING DIE TO CAUSE HIGH FREQUENCY VARIATIONS IN THE SPACE BETWEEN THE FORMING DIE AND CORE TUBE SO THAT MELT FRACTURE AND THUS BEADINESS AND ROUGHNESS OF PLASTIC MATERIAL BEING EXTRUDED ARE REDUCED.
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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |