Patent US3700519A successfully refreshed from Google Patents.
US3700519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of forming a fiber reinforced pipe on an inflatable mandrel
Assignee: Novartis Corp
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Filing: 1969-05-13
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Granted: 1972-10-24
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Expires: 1989-05-13
Abstract
Abstract A METHOD AND APPARATUS IS PROVIDED FOR CONTINUOUSLY MAKING FIBER REINFORCED PLASTIC PIPE IN WHICH A CONVEYOR TUBE IS FORMED ON AN AXIALLY FIXED HOLLOW ROTATABLE MANDREL. A PLURALITY OF BANKS OF RESIN IMPREGNATED FIBER ELEMENTS ARE WOUND ON THE CONVEYOR TUBE AS IT ADVANCES TO PROVIDE THE PIPE ASSEMBLY. THE TERMINAL END OF THE GENERATED PIPE ASSEMBLY IS SEALED WITH A PLUG. A FLUID UNDER PRESSURE IS FED THROUGH THE HOLLOW MANDREL AND OUT THE FORWARD END OF THE MANDREL INTO A CHAMBER FORMED BY THE GENERATED PIPE ASSEMBLY, THE PLUG, AND A FLUID SEALING MEANS WITHIN THE PIPE ASSEMBLY BEING GENERATED, THEREBY CAUSING THE PIPE ASSEMBLY TO ADVANCE.
Inventors
- 👤 J Warne Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:40
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/60; B29C2793/00; B29C2793/009; B29L; B29L2009/00
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |