US3564472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Windings for transformers or choke coils
Assignee: Smit Nijmegen Electrotechnische Fabrieken NV
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Filing: 1968-08-02
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Granted: 1971-02-16
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Expires: 1988-08-02
Abstract
Abstract TRANSFORMER OR CHOKE COIL WINDING WRAPPED IN A TORUSSHAPED ENVELOPE MADE FROM MATERIAL WHICH IS ADAPTED TO BE SUBJECTED TO A TENSILE LOAD IN PLANES CONTAINING THE AXIS OF THE WINDING, IN WHICH A PNEUMATICALLY OR HYDRAULICALLY EXPANDABLE BAG IS PROVIDED BETWEEN ONE OR EACH OF BOTH END FACES OF THE WINDING AND SAID ENVELOPE TO EXERT AXIAL PRESSURE ON THE WINDING.
Inventors
- 👤 Egbertus Adrianus Frowein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:07
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/02; H01F27/002; H01F27/28; H01F27/30; H01F27/303; H01F27/32; H01F27/324; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/127; C; C03; C03C; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/229; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/112; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |