US2593490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio signal tone control
Assignee: Farnsworth Research Corp
•
Filing: 1947-03-27
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Granted: 1952-04-22
•
Expires: 1967-03-27
Abstract
No abstract record available.
Inventors
- 👤 Robert W Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:41
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/02; H03G5/04; H03G5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1700393A
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US2072708A
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US2101688A
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US2230996A
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CH216062A
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US2350869A
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US2313098A
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US2384263A
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US2429755A
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US2408242A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |