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US3462562A
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Tap changer for transformers with elongated switch-over contact
Assignee: ABB Norden Holding AB
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Filing: 1967-11-20
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Granted: 1969-08-19
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Expires: 1987-11-20
Abstract
No abstract record available.
Inventors
- 👤 Sivert Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:43
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/02; H01F29/04; H01F29/14; H01F29/143; H01H; H01H9/00; H01H9/0005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US485619A
Cited
US2177109A
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US2201642A
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US2693573A
Cited
US2878333A
Cited
US3066208A
Cited
US3070964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-18 | 1973-02-17 | 1973-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-18 | 1977-02-17 | 1977-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-18 | 1981-02-17 | 1981-08-19 | $7700.00 | Window Closed / Lapsed |