Patent US2399777A successfully refreshed from Google Patents.
US2399777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airway traffic control system
Assignee: SPX Technologies Inc
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Filing: 1943-08-31
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Granted: 1946-05-07
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Expires: 1963-08-31
Abstract
No abstract record available.
Inventors
- 👤 Sedgwick N Wight
- 👤 Oscar S Field
- 👤 Oscar H Dicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
G; G08; G08G; G08G5/00; G08G5/20; G08G5/22; G08G5/50; G08G5/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-05-06 | 1949-11-05 | 1950-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-05-06 | 1953-11-05 | 1954-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-05-06 | 1957-11-05 | 1958-05-07 | $7700.00 | Window Closed / Lapsed |