Patent US2538494A successfully refreshed from Google Patents.
US2538494A
Expired / Lapsed
US
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Servo control amplifier
Assignee: RCA Corp
•
Filing: 1946-01-15
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Granted: 1951-01-16
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Expires: 1966-01-15
Abstract
No abstract record available.
Inventors
- 👤 Loy E Barton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:44
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1418; G05D3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2020275A
Cited
US1959803A
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US2115086A
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US2275317A
Cited
US2307134A
Cited
US2448793A
Cited
US2423438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |