US2917740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio beacons
Assignee: Marconis Wireless Telegraph Co Ltd
•
Filing: 1953-06-15
•
Granted: 1959-12-15
•
Expires: 1973-06-15
Abstract
No abstract record available.
Inventors
- 👤 Ramsay John Forrest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:00
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/12; H01Q3/16; G; G01; G01S; G01S13/00; G01S13/74; G01S13/75; G01S13/751; G01S13/756; H01Q15/00; H01Q15/23; H01Q3/44; H01Q3/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE694523C
Cited
US2432984A
Cited
US2443643A
Cited
US2472782A
Cited
GB654734A
Cited
US2557979A
Cited
GB684300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |