US2678437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air traffic control system
Assignee: SPX Technologies Inc
•
Filing: 1949-04-27
•
Granted: 1954-05-11
•
Expires: 1969-04-27
Abstract
No abstract record available.
Inventors
- 👤 Nelson B Coley
- 👤 Reginald F Albrighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:01
CPC Classifications
G; G08; G08G; G08G5/00; G08G5/20; G08G5/26; G08G5/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1763390A
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US1894019A
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US2252083A
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US2403755A
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US2531412A
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US2459811A
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US2521697A
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US2421017A
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US2554329A
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US2517540A
Cited
US2483097A
Cited
US2588930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |