US2689886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization circuit for thermionic valve amplifiers, modulators, and repeaters
Assignee: Marconis Wireless Telegraph Co Ltd
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Filing: 1951-04-05
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Granted: 1954-09-21
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Expires: 1971-04-05
Abstract
No abstract record available.
Inventors
- 👤 Cooper Victor James
- 👤 Smith Norman Neville Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:09
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/607; H; H04; H04N; H04N5/00; H04N5/14; H04N5/16; H04N5/165
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) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |