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Patent US2657476A successfully refreshed from Google Patents.
US2657476A
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Signaling system and device for aircraft operation
Assignee: TRANS TRADING CORP
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Filing: 1951-03-20
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Granted: 1953-11-03
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Expires: 1971-03-20
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Holcombe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:25
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/0055; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/28
Claims Analysis
Total Claims: 0
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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) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |