US3555128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the controlled extrusion of multicomponent synthetic resinous bodies
Assignee: Dow Chemical Co
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Filing: 1969-03-10
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Granted: 1971-01-12
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Expires: 1989-03-10
Abstract
Abstract IN EXTRUSION OF LAYERED FILM WHERE A LAYERED STREAM IS DISCHARGED FROM A SINGLE DIE, CONTROL OF THE VOLUME OF MATERIAL PASSING THROUGH THE FEED PORTS IS OBTAINED BY INTRODUCTING VARYING MECHANICAL SHEAR RATES TO AT LEAST A PORTION OF THE INDIVIDUAL LAYERS OF THE COMPOSITE STREAM.
Inventors
- 👤 Walter J Schrenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:04
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21; B29C48/304
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |