US2840647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Input and output coaxial-type circuits for double ended vacuum tubess
Assignee: RCA Corp
•
Filing: 1956-05-23
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Granted: 1958-06-24
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Expires: 1976-05-23
Abstract
No abstract record available.
Inventors
- 👤 Leslie L Koros
- 👤 Merle V Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:52
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2169396A
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US2153728A
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US2207846A
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US2289846A
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US2425748A
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US2410109A
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US2727950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |