US3331901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for condensing volatile components of extruded thermoplastic tubing
Assignee: EIDP Inc
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Filing: 1963-12-17
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Granted: 1967-07-18
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Expires: 1983-12-17
Abstract
No abstract record available.
Inventors
- 👤 Carmen V Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:11
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/908; B29C48/03; B29C48/09; B29C48/10; B29C48/901; B29C48/902; B29C48/001; B29C48/0018; B29C48/0019
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
A METHOD OF PRODUCING THERMOPLASTIC TUBING WHICH COMPRISES EXTRUDING THE MOLTEN THERMOPLASTIC POLYMER IN THE FORM OF A TUBE FROM AN ANNULAR DIE, CONTINUOUSLY WITHDRAWING THE TUBING FROM THE POINT OF EXTRUSION, FLATTENING THE TUBING AT A POINT SPACED FROM THE POINT OF EXTRUSION, MAINTAINING A BUBBLE OF GASEOUS MEDIUM IN THE SECTION OF TUBING EXTENDING FROM THE POINT OF EXTRUSION TO THE POINT OF FLATTENING, COOLING THE INTERIOR OF SAID TUBING BY MEANS OF A COOLING MEDIUM WHICH CONTINUOUSLY CIRCULATES THROUGH THE INTERIOR OF A SHAPED COOLER PLACED WITHIN SAID BUBBLE, THE GASEOUS MEDIUM IN THE BUBBLE BEING UNDER A DIFFERENTIAL PRESSURE SUCH TAHT THE PRESSURE IN THE ZONE BETWEEN THE DIE AND THE SHAPED COOLER IS SUFFICIENT TO EXPAND THE TUBING WHILE IN THE PLASTIC FORMATIVE STATE TO THE DESIRED DIAMETER WHILE THE PRESSURE IN THE ZONE FROM THE SHAPED COOLER TO THE POINT OF FLATTENING IS SUFFICIENT TO DEEP THE TUBING EXPANDED BUT INSUFFICIENT TO CAUSE FURTHER EXPANSION, CONDENSING THE VOLATILE COMPONENTS FROM THE THERMOPLASTIC POLYMER BY MEANS OF A COOLED CONDENSER SECTION MOUNTED IN THE ZONE BETWEEN THE DIE AND THE SHAPED COOLER AND DEPOSITING SAID CONDENSE VOLATILE COMPONENTS INTO A RECEPTACLE LOCATED BELOW SAID COOLED CONDENSER SECTION.
Claim 2
Independent Claim
202 words
A METHOD OF PRODUCING THERMOPLASTIC TUBING WHICH COMPRISES EXTRUDING THE MOLTEN THERMOPLASTIC POLYMER IN THE FORM OF A TUBE FROM AN ANNULAR DIE, CONTINUOUSLY WITHDRAWING THE TUBING FROM THE POINT OF EXTRUSION, FLATTENING THE TUBING AT A POINT SPACED FROM THE POINT OF EXTRUSION, MAINTAINING A BUBBLE OF GASEOUS MEDIUM IN THE SECTION OF TUBING EXTENDING FROM THE POINT OF EXTRUSION TO THE POINT OF FLATTENING, COOLING THE INTERIOR OF SAID TUBING BY MEANS OF A COOLING MEDIUM WHICH CONTINUOUSLY CIRCULATES THROUGH THE INTERIOR OF A SHAPED COOLER PLACED WITHIN SAID BUBBLE, THE GASEOUS MEDIUM IN THE BUBBLE BEING UNDER A DIFFERENTIAL PRESSURE SUCH TAHT THE PRESSURE IN THE ZONE BETWEEN THE DIE AND THE SHAPED COOLER IS SUFFICIENT TO EXPAND THE TUBING WHILE IN THE PLASTIC FORMATIVE STATE TO THE DESIRED DIAMETER WHILE THE PRESSURE IN THE ZONE FROM THE SHAPED COOLER TO THE POINT OF FLATTENING IS SUFFICIENT TO DEEP THE TUBING EXPANDED BUT INSUFFICIENT TO CAUSE FURTHER EXPANSION, CONDENSING THE VOLATILE COMPONENTS FROM THE THERMOPLASTIC POLYMER BY MEANS OF A COOLED CONDENSER SECTION MOUNTED IN THE ZONE BETWEEN THE DIE AND THE SHAPED COOLER AND DEPOSITING SAID CONDENSE VOLATILE COMPONENTS INTO A RECEPTACLE LOCATED BELOW SAID COOLED CONDENSER SECTION.
References Cited (Backward Citations)
US2966700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |