US2535954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airway traffic controlling system
Assignee: SPX Technologies Inc
•
Filing: 1946-01-16
•
Granted: 1950-12-26
•
Expires: 1966-01-16
Abstract
No abstract record available.
Inventors
- 👤 Neil D Preston
- 👤 Forest B Hitchcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:37
CPC Classifications
G; G08; G08G; G08G5/00; G08G5/50; G08G5/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US748941A
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US1849694A
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US1935910A
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US2155825A
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US2246449A
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US2344761A
Cited
US2399777A
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US2386743A
Cited
US2474438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |