Patent US2475256A successfully refreshed from Google Patents.
US2475256A
Expired / Lapsed
US
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Airplane traffic controlling system
Assignee: SPX Technologies Inc
•
Filing: 1942-05-15
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Granted: 1949-07-05
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Expires: 1962-05-15
Abstract
No abstract record available.
Inventors
- 👤 Samuel P Saint
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:55
CPC Classifications
G; G08; G08G; G08G5/00; G08G5/20; G08G5/22; G01; G01S; G01S1/00; G01S1/02; G08G5/50; G08G5/54; G08G5/56
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) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |