US3752612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the continuous production of tubular film from thermoplastic synthetic resins
Assignee: Akzo NV
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Filing: 1971-05-18
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Granted: 1973-08-14
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Expires: 1991-05-18
Abstract
Abstract An apparatus for the production of wrinkle-free tubular films from thermoplastic synthetic resins is disclosed. The apparatus comprises an extruder, at least one guide surface, and haul-off rolls. The guide surface is covered with a layer of synthetic resin containing at least 0.5% glass fiber. The presence of the glass fiber in the synthetic resin produces a somewhat granular surface which minimizes or eliminates wrinkling in the extruded film.
Inventors
- 👤 Duuren A Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:45
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/001; B29C48/0018; B29C48/0019; B29C48/09; B29C48/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
An apparatus for the continuous manufacture of tubular film from thermoplastic synthetic resin comprising an extruder, at least one fired guide surface for flattening the extruded film, and a pair of haul-off rolls, wherein said guide surface is covered with a layer of synthetic resin, wherein said resin layer consists essentially of polyamide, and contains at least 0.5% glass fiber.
Claim 2
Independent Claim
60 words
An apparatus for the continuous manufacture of tubular film from thermoplastic synthetic resin comprising an extruder, at least one fired guide surface for flattening the extruded film, and a pair of haul-off rolls, wherein said guide surface is covered with a layer of synthetic resin, wherein said resin layer consists essentially of polyamide, and contains at least 0.5% glass fiber.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |