US2607954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming gel-free thermoplastic films
Assignee: Celanese Corp
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Filing: 1950-06-17
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Granted: 1952-08-26
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Expires: 1970-06-17
Abstract
No abstract record available.
Inventors
- 👤 Schneider George
- 👤 Andersen Bjorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:31
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/69; B29C48/03; B29C48/07; B29C48/08; B29C48/254; B29C48/2545; B29C48/693
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
IN AN APPARATUS FOR THE PRODUCTION OF FILMS WHEREIN A GEL-CONTAINING THERMOPLASTIC MATERIAL IS FORCED THROUGH A SHAPING NOZZLE AT AN ELEVATED TEMPERATURE BY MEANS OF AN EXTRUDER, A FILTERING MEDIUM COMPRISING A LAYER OF INERT GRANULES, WET WITH A PLASTICISER FOR THE THERMOPLASTIC MATERIAL, POSTIONED BETWEEN THE EXTRUDER AND THE SHAPING NOZZLE, WHEREBY GELS ARE REMOVED AND THE OPTICAL HOMOGENEITY OF THE EXTRUDED FILMS IS IMPROVED.
Claim 2
Dependent Claim
67 words
IN AN APPARATUS FOR THE PRODUCTION OF FILMS WHEREIN A GEL-CONTAINING THERMOPLASTIC MATERIAL IS FORCED THROUGH A SHAPING NOZZLE AT AN ELEVATED TEMPERATURE BY MEANS OF AN EXTRUDER, A FILTERING MEDIUM COMPRISING A LAYER OF INERT GRANULES, WET WITH A PLASTICISER FOR THE THERMOPLASTIC MATERIAL, POSTIONED BETWEEN THE EXTRUDER AND THE SHAPING NOZZLE, WHEREBY GELS ARE REMOVED AND THE OPTICAL HOMOGENEITY OF THE EXTRUDED FILMS IS IMPROVED.
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) | 1955-08-26 | 1956-02-25 | 1956-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-26 | 1960-02-25 | 1960-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-26 | 1964-02-25 | 1964-08-26 | $7700.00 | Window Closed / Lapsed |