US2815446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube protective system
Assignee: RCA Corp
•
Filing: 1954-03-31
•
Granted: 1957-12-03
•
Expires: 1974-03-31
Abstract
No abstract record available.
Inventors
- 👤 Edward M Coombs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:42
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H02; H02H; H02H3/00; H02H3/02; H02H3/021; H02H3/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2676284A
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US2615147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |