US3558755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of layered synthetic products
Assignee: Akzona Inc
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Filing: 1969-03-10
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Granted: 1971-01-26
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Expires: 1989-03-10
Abstract
Abstract A PROCESS FRO PRODUCING A SYNTHETIC POLYMERIC PRODUCT MADE UP OF A PLURALITY OF LAYERS OF ALTERNATELY DIFFERENT COMPONENT TO POLYMERS WHICH COMPRISES FORMING AT LEAST ONE MULTI-LAYER STREAM OF PARALLEL FLAT POLYMERIC LAYERS, PASSING A STREAM OF THE PARALLEL FLAT LAYERS INTO EITHER HALF OF AN ANNULAR SPACE TO FORM TWO SUB-STREAMS, CAUSING THE SUBSTREAMS TO COALESCE TO FORM A MAIN ANNULAR STREAM OF UNINTERRUPTED ANNULAR POLYMERIC LAYERS, AND THREAFTER EX TRUDING THE MAIN STREAM THROUGH AN EXTRUSION OPENING, AND COOLING THE EXTRUDED STREAM. THE THINNEST LAYER OF THE MULTI-LAYER STREAM HAS A THICKNESS NOT LESS THAN ABOUT ONE MILLIMETER.
Inventors
- 👤 Theodorus F Laban
- 👤 Bertus H Zandstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:18
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/06; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/12; B29C48/14; B29C48/147; B29C48/1472; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C2791/00; B29C2791/004; B29C2791/007
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |