Patent US2589299A successfully refreshed from Google Patents.
US2589299A
Expired / Lapsed
US
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Safety control circuit for electronic amplifiers
Assignee: Individual
•
Filing: 1950-05-23
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Granted: 1952-03-18
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Expires: 1970-05-23
Abstract
No abstract record available.
Inventors
- 👤 Barton T Sctchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:54
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2476854A
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US2510027A
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US2492090A
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US2553360A
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US2543305A
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US2545346A
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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) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |