US2531820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage transformer
Assignee: RCA Corp
•
Filing: 1946-03-08
•
Granted: 1950-11-28
•
Expires: 1966-03-08
Abstract
No abstract record available.
Inventors
- 👤 Nils E Lindenblad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:53
CPC Classifications
H; H01; H01F; H01F19/00; H01F19/04; H01F19/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US534802A
Cited
US1844501A
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US1706193A
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US2029041A
Cited
US2089860A
Cited
US2181899A
Cited
US2318095A
Cited
US2348325A
Cited
US2388473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |