US2730573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feed-back amplifier systems and servo mechanisms that are adapted to respond to input changes at very low frequencies
Assignee: Sperry Gyroscope Co Ltd
•
Filing: 1949-11-30
•
Granted: 1956-01-10
•
Expires: 1969-11-30
Abstract
No abstract record available.
Inventors
- 👤 Sedgfield Hugh Brougham
- 👤 Summerlin Frederick Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:50
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1445
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2481485A
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US2475576A
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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) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |