Patent US3557447A successfully refreshed from Google Patents.
US3557447A
Expired / Lapsed
US
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Method of producing an insulator of glass fiber reinforced cast resin
Assignee: Siemens AG
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Filing: 1968-11-04
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Granted: 1971-01-26
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Expires: 1988-11-04
Abstract
Abstract DESCRIBED IS A METHOD OF PRODUCING AN INSULATOR OF GLASS FIBER REINFORCED CAST RESIN. A PRESTRESSED GLASS FIBER CORD, WHICH HAD BEEN PRETREATED WITH AN EPOXIDE RESIN MIXTURE AND LOCATED IN THE INTERIOR CHAMBER OF A FORM IS FIXED THEREIN AT THE CAPS AND IS EXPANDED WITH THE SAME EPOXIDE RESIN HARDENER MIXTURE. TO PRODUCE A MANTEL, A FILLER-CONTAINING CASTING RESIN WHICH IS RESISTANT TO CREEP CURRENT, TO ELECTRIC ARC AND TO ATMOSPHERIC AIR IS CAST AROUND THE CORDS AND HEAT HARDENED.
Inventors
- 👤 Wolfgang Gruber
- 👤 Gunter Steger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:50
CPC Classifications
H; H01; H01B; H01B17/00; H01B17/32; B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49227
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |