US2515633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air traffic control system
Assignee: SPX Technologies Inc
•
Filing: 1949-05-18
•
Granted: 1950-07-18
•
Expires: 1969-05-18
Abstract
No abstract record available.
Inventors
- 👤 Nelson B Coley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:00
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)
US2139352A
Cited
US2268240A
Cited
US2276646A
Cited
US2344231A
Cited
US2452590A
Cited
US2444243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |