US4960552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sheetlike preshapes
Assignee: BASF SE
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Filing: 1987-02-13
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Granted: 1990-10-02
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Expires: 2007-02-13
Abstract
Abstract A sheetlike, thermoplastically moldable preshape is produced by extruding a liquid-crystalline polymer by dividing the melt into two or more separate streams, then conferring different directions of orientation on the polymer in these separate streams, recombining the separate streams and extruding the recombined melt stream.
Inventors
- 👤 Michael Portugall
- 👤 Franz Schumacher
- 👤 Erhard Seiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:15
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/695; B29C48/70; B29C48/705; B29C48/022; B29C48/001; B29C48/0017; B29C48/0018; B29C48/0021; B29C48/0022; B29C48/03; B29C48/07; B29C48/08; B29K; B29K2105/00; B29K2105/0079
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A process for producing a sheetlike, thermoplastically moldable preshape based on a liquid-crystalline polymer and composed of two or more layers in which the polymer is oriented in different directions, which comprises melting the polymer in an extruder, dividing the melt into two or more separate streams, then conferring different directions of orientation on the polymer in the separate streams, recombining the separate streams before the discharge orifice of the extruder die before the polymer solidifies, and extruding the recombined single melt stream as a sheetlike preshape.
Claim 2
Dependent Claim
87 words
A process for producing a sheetlike, thermoplastically moldable preshape based on a liquid-crystalline polymer and composed of two or more layers in which the polymer is oriented in different directions, which comprises melting the polymer in an extruder, dividing the melt into two or more separate streams, then conferring different directions of orientation on the polymer in the separate streams, recombining the separate streams before the discharge orifice of the extruder die before the polymer solidifies, and extruding the recombined single melt stream as a sheetlike preshape.
References Cited (Backward Citations)
JPS526761A
Cited
US4332759A
Cited
US4508891A
Cited
US4384016A
Cited
JPS5859818A
Cited
US4581399A
Cited
US4614629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |