Patent US3249670A successfully refreshed from Google Patents.
US3249670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic tube extrusion process
Assignee: Hoechst AG
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Filing: 1962-02-05
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Granted: 1966-05-03
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Expires: 1982-02-05
Abstract
No abstract record available.
Inventors
- 👤 Rottner Emil
- 👤 Schiedrum Hans-Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:51
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/908; B29C48/03; B29C48/09; B29C48/30; B29C48/32; B29C48/34; B29C48/78; B29C48/80; B29C48/83; B29C48/832; B29C48/86; B29C48/865; B29C48/919; B29C48/001; B29C48/0018; B29C48/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR THE CONTINUOUS FORMATION OF A THIN WALLED TUBE OF HIGH STRENGTH WHICH COMPRISES EXTRUDING MOTLEN THERMOPLASTIC RESIN THROUGH AN ANNULAR PASSAGEWAY FORMED BETWEEN A DIE AND A MANDREL, TURNING THE DIRECTION OF FLOW OF THE PLASTIC 180* AND OUTWARDLY BY CONDUCTING IT THROUGH AN ANNULAR PASSAGEWAY FORMED BY THE LIP AND OUTSIDE SURFACE OF THE DIE AND SURFACES OF THE MANDREL, AGAIN TURNING THE DIRECTION OF THE FLOW OF PLASTIC 180* AND OUTWARDLY AROUND AN EXTERNAL SURFACE OF THE MANDREL, COOLING THE PLASTIC DURING THE SECOND TURNING SO THAT IT BEGINS TO SOLIDIFY, AND SIMULTANEOUSLY DRAWING THE THUS FORMED TUBE AWAY FROM THE EXTRUDER.
Claim 2
Dependent Claim
107 words
A PROCESS FOR THE CONTINUOUS FORMATION OF A THIN WALLED TUBE OF HIGH STRENGTH WHICH COMPRISES EXTRUDING MOTLEN THERMOPLASTIC RESIN THROUGH AN ANNULAR PASSAGEWAY FORMED BETWEEN A DIE AND A MANDREL, TURNING THE DIRECTION OF FLOW OF THE PLASTIC 180* AND OUTWARDLY BY CONDUCTING IT THROUGH AN ANNULAR PASSAGEWAY FORMED BY THE LIP AND OUTSIDE SURFACE OF THE DIE AND SURFACES OF THE MANDREL, AGAIN TURNING THE DIRECTION OF THE FLOW OF PLASTIC 180* AND OUTWARDLY AROUND AN EXTERNAL SURFACE OF THE MANDREL, COOLING THE PLASTIC DURING THE SECOND TURNING SO THAT IT BEGINS TO SOLIDIFY, AND SIMULTANEOUSLY DRAWING THE THUS FORMED TUBE AWAY FROM THE EXTRUDER.
References Cited (Backward Citations)
US2177633A
Cited
US2663904A
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DE1013865B
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US3066356A
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US3108851A
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US3057013A
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US3079636A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |