US3720557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for lining conductive tubes with insulating material
Assignee: Pirelli and C SpA
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Filing: 1970-10-21
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Granted: 1973-03-13
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Expires: 1990-10-21
Abstract
Abstract PROCESS FOR PRODUCING A LAYER OF INSULATING MATERIAL ON THE INTERIOR OF A CONDUCTIVE TUBE IN WHICH A TUBE OF INSULATING MATERIAL IS EXTRUDED BY AN EXTRUDER HEAD AND EXPANDED WITHIN THE CONDUCTIVE TUBE AS IT IS EXTRUDED BY A SECOND EXTRUDER HEAD CO-AXIAL WITH THE FIRST HEAD AS THE CONDUCTIVE TUBE IS ADVANCED, THE INSULATING TUBE ENGAGING THE INNER WALL OF THE CONDUCTIVE TUBE AT A POINT WHERE THE TEMPERATUE OF THE LATTER IS APPROXIMATELY EQUAL TO THE MELTING TEMPERATURE OF THE INSULATING MATERIAL.
Inventors
- 👤 S Longoni
- 👤 A Portinari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:32
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; B; B29; B29C; B29C48/00; B29C48/15; B29C48/151; B29C48/152; H01P; H01P11/00; H01P11/001; H01P11/002; B29C48/03; B29C48/09
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |