US2955321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for manufacturing polyethylene tubing
Assignee: Plax Corp
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Filing: 1956-11-09
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Granted: 1960-10-11
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Expires: 1976-11-09
Abstract
No abstract record available.
Inventors
- 👤 Fortner Cecil Paul
- 👤 Clarence G Reber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:54
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/908; B29C48/03; B29C48/09; B29C48/10; B29C48/901; B29C48/903; B29C48/919; B29C48/885; B29C48/911; B29C48/9115; B29C48/912
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
114 words
THE PROCESS OF FORMING TUBING OF THERMOPLASTIC MATERIAL WHICH INCLUDES EXTRUDING THE PLASTIC TUBING FROM AN ANNULAR DIE IN TUBULAR FORM, INTRODUCING A FLUID PRESSURE MEDIUM INTO THE EXTRUDING PLASTIC TUBING TO INFLATE THE SAME PASSING THE INFLATED PLASTIC TUBING THROUGH A SIZING RING TO CONFINE THE TUBING TO A PREDETERMINED DIAMETER, ESTABLISHING AN ENCIRCLING WALL OF COOLING LIQUID ABOVE THE SIZING RING WITH THE INTERNAL FLUID PRESSURE MEDIUM HOLDING THE PLASTIC TUBING AGAINST THE SIZING RING TO MAINTAIN COOLING LIQUID ABOVE THE SIZING RING AND THEREBY COOL AND SET THE INFLATED PLASTIC TUBING BY ENGAGEMENT WITH SAID LIQUID WALL, CONTROLLING INTRODUCTION OF FLUID PRESSURE MEDIUM INTO THE EXTRUDING PLASTIC TUBING IN RELATION TO
References Cited (Backward Citations)
US1601686A
Cited
US1744884A
Cited
US2452080A
Cited
US2541064A
Cited
US2583330A
Cited
US2641022A
Cited
US2697852A
Cited
BE530848A
Cited
GB741963A
Cited
US2863172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |