US2818472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutralized triode tuner
Assignee: Standard Coil Products Co Inc
•
Filing: 1955-02-18
•
Granted: 1957-12-31
•
Expires: 1975-02-18
Abstract
No abstract record available.
Inventors
- 👤 Robert C A Eland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:51
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/08; H03F1/14; H03F1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2226694A
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US2270953A
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US2398050A
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US2569667A
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US2589092A
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GB678384A
Cited
US2709788A
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US2686903A
Cited
US2714192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |