US2806989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic synchronous converters
Assignee: RCA Corp
•
Filing: 1953-08-31
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Granted: 1957-09-17
•
Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 Frederic F Shoup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:56
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/40; G; G05; G05B; G05B11/00; G05B11/01; G05B11/012; G05B11/013
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |