US3011141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-phase transformer core
Assignee: Central Transformer Corp
•
Filing: 1954-12-13
•
Granted: 1961-11-28
•
Expires: 1974-12-13
Abstract
No abstract record available.
Inventors
- 👤 George A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:56
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F27/00; H01F27/24; H01F27/245; H01F27/2455
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2456458A
Cited
US2542806A
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US2456461A
Cited
US2467868A
Cited
US2516164A
Cited
US2579578A
Cited
FR1038604A
Cited
US2634321A
Cited
US2889525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-27 | 1965-05-29 | 1965-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-27 | 1969-05-29 | 1969-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-27 | 1973-05-29 | 1973-11-28 | $7700.00 | Window Closed / Lapsed |