Patent US3677849A successfully refreshed from Google Patents.
US3677849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medium voltage cables
Assignee: Pirelli and C SpA
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Filing: 1969-10-06
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Granted: 1972-07-18
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Expires: 1989-10-06
Abstract
Abstract DESCRIBES A MEDIUM VOLTAGE CABLE INCLUDING AN INSULATING LAYER AND A SEMICONDUCTIVE LAYER IN CONTIGUOUS BUT NOT ADHESIVE RELATIONSHIP. THE INSULATING LAYER IS AN AMORPHOUS OLEFIN COPOLYMER, SATURATED OR UNSATURATED, AND THE SEMICONDUCTIVE LAYER IS A COMPOSITION CONTAINING CARBON PARTICLES DISPERSED IN CHLOROSULFONATED POLYETHYLENE. PRODUCT IS PREPARED BY HEAT TREATMENT OF THE SUPERIMPOSED LAYERS ON A CONDUCTOR.
Inventors
- 👤 Luigi Lombardi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:57
CPC Classifications
H; H01; H01B; H01B9/00; H01B9/02; H01B9/027; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; H01B3/443
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |