US2709252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-plane tracking in ground controlled approach system
Assignee: Gilfillan Bros Inc
•
Filing: 1948-08-20
•
Granted: 1955-05-24
•
Expires: 1968-08-20
Abstract
No abstract record available.
Inventors
- 👤 Homer G Tasker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:30
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/04; G01S7/06; G01S7/20; G01S13/00; G01S13/88; G01S13/91; G01S13/913; H; H01; H01Q; H01Q3/00; H01Q3/01; H01Q3/26; H01Q3/30; H01Q3/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE668231C
Cited
US2156653A
Cited
US2271300A
Cited
US2440250A
Cited
US2426189A
Cited
US2452349A
Cited
US2436408A
Cited
US2421747A
Cited
GB586689A
Cited
US2480208A
Cited
US2489865A
Cited
US2585855A
Cited
GB588851A
Cited
US2512147A
Cited
US2470016A
Cited
GB599572A
Cited
US2521844A
Cited
GB604257A
Cited
US2480143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |