Patent US3726743A successfully refreshed from Google Patents.
US3726743A
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US
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Film blowing method and apparatus
Assignee: Reifenhaeuser GmbH and Co KG Maschinenenfabrik
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Filing: 1970-11-02
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Granted: 1973-04-10
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Expires: 1990-11-02
Abstract
Abstract An apparatus for the blowing of thermoplastic film wherein a pair of closed envelopes of thermoplastic material are extruded from concentric and coaxial dies and are independently blown and orientated prior to being passed together between a pair of calendaring and compression rolls. A parting compound to enable separation of the laminated foils emerging from the rolls or an adhesion means may be applied to the interface of the two blown bodies.
Inventors
- 👤 F Reifenhauser
- 👤 H Rahlfs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:40
CPC Classifications
B; B32; B32B; B32B27/00; B29; B29C; B29C48/00; B29C48/001; B29C48/0013; B29C48/0015; B29C48/0016; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/10
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |