US3557265A
Expired / Lapsed
US
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Method of extruding laminates
Assignee: Dow Chemical Co
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Filing: 1967-12-29
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Granted: 1971-01-19
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Expires: 1987-12-29
Abstract
Abstract A METHOD IS DESCRIBED WHEREBY PLASTIC FILM OR SHEET HAVING A PLURALITY OF LAYERS IS FORMED BY DEFORMING A FLOWING STREAM HAVING LAYERS OF DIVERSE THERMOPLASTIC MATERIAL WHEREIN THE CROSS-SECTIONAL DONFIGURATION OF THE PLURALITY OF FLOWING STREAMS IS ALTERED BY REDUCING THE DIMENSION OF THE STREAM IN A DIRECTION GENERALLY PERPENDICULAR TO THE INTERFACES BETWEEN THE INDIVIDUAL STREAMS AND BY INCREASING THE DIMENSION OF THE STREAM IN A DIRECTION GENERALLY PARALLEL TO THE SAID INTERFACE TO PROVIDE A SHEET OR FILM HAVING A LAMINAR STRUCTURE. OPTIONALLY, ALTERNATING FOAMED AND UNFOAMED LAYERS MAY BE OBTAINED. D R A W I N G
Inventors
- 👤 Douglas Chisholm
- 👤 Walter J Schrenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:20
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/22; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |