Patent US2500766A successfully refreshed from Google Patents.
US2500766A
Expired / Lapsed
US
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Electrical transformer
Assignee: RCA Corp
•
Filing: 1946-11-29
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Granted: 1950-03-14
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Expires: 1966-11-29
Abstract
No abstract record available.
Inventors
- 👤 Maximilian J Obert
- 👤 Edwin L Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:30
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/26; H01F27/263
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1732937A
Cited
US790581A
Cited
US1486648A
Cited
GB215186A
Cited
US1807135A
Cited
US1815380A
Cited
US2156461A
Cited
US2372067A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |