US2659845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency alternating current transformer
Assignee: WAYNE KERR LAB Ltd
•
Filing: 1950-02-13
•
Granted: 1953-11-17
•
Expires: 1970-02-13
Abstract
No abstract record available.
Inventors
- 👤 Calvert Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:55
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/20; H01F38/22; H01F38/28; H01F38/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US354274A
Cited
US400515A
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US1731012A
Cited
GB385806A
Cited
US2027861A
Cited
US2158493A
Cited
US2384799A
Cited
US2474395A
Cited
US2470598A
Cited
US2477074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |