US2588930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airway traffic control system
Assignee: SPX Technologies Inc
•
Filing: 1947-04-22
•
Granted: 1952-03-11
•
Expires: 1967-04-22
Abstract
No abstract record available.
Inventors
- 👤 Hugh C Kendall
- 👤 Lionel H Orpin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:14
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/78
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1894019A
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US1924174A
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US2262838A
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US2467465A
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US2464353A
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US2444452A
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US2468045A
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US2480123A
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US2421017A
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US2471416A
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US2457522A
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US2483097A
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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) | 1955-03-11 | 1955-09-10 | 1956-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-11 | 1959-09-10 | 1960-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-11 | 1963-09-10 | 1964-03-11 | $7700.00 | Window Closed / Lapsed |