US2808505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant-gain amplifier system
Assignee: Telefunken AG
•
Filing: 1953-01-12
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Granted: 1957-10-01
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Expires: 1973-01-12
Abstract
No abstract record available.
Inventors
- 👤 Cantz Rudolf
- 👤 Nowak Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:26
CPC Classifications
B; B66; B66B; B66B3/00; B66B3/02; B66B3/026; H; H03; H03F; H03F1/00; H03F1/52; H03F1/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1997393A
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US2053414A
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US2323250A
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US2049777A
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US2107395A
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US2432183A
Cited
US2631229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |