US2975413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simplified ground controlled approach system including adaptations for surveillance, precision approach, taxi and height finding
Assignee: Gilfillan Bros Inc
•
Filing: 1955-05-27
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Granted: 1961-03-14
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Expires: 1975-05-27
Abstract
No abstract record available.
Inventors
- 👤 Robert W Landee
- 👤 James R Deen
- 👤 John J Fling
- 👤 Robert G Shaw
- 👤 Ronald R Davis
- 👤 James K Johnston
- 👤 Paul L Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:16
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/91; G01S13/913; G01S7/00; G01S7/02; G01S7/40; G01S7/4004; G01S7/4026; G01S7/403; G01S7/4034
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |