US3819788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruded plastic films and method for forming the same
Assignee: Cellophane SA France
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Filing: 1971-11-23
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Granted: 1974-06-25
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Expires: 1991-11-23
Abstract
Abstract A process is disclosed for preparing plastic film having space transverse ribs thereon wherein the plastic is extruded in tubular shape, drawn into a hallow member by vacuum after extrusion while still hot or after reheating and moving the hollow member along with the tubular shape while fusing portions of the tubular film upon itself to give a circumferential rib then releasing the vacuum and moving the hollow member back in the opposite direction to position the member for a repeat of the operation.
Inventors
- 👤 P Grumbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:57
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/16; B29C48/18; B29C48/20; B29C48/19; B29C48/001; B29C48/0018; B29C48/0019; B29C48/03; B29C48/05; B29C48/09; B29C48/10; B29C48/12; B29C48/13; B29L; B29L2023/00; B29L2023/003
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |