US2489218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument for landing aircraft
Assignee: LAFAYETTE M HUGHES
•
Filing: 1944-11-07
•
Granted: 1949-11-22
•
Expires: 1964-11-07
Abstract
No abstract record available.
Inventors
- 👤 Robert J Herbold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:52
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607; G05D1/0653; G05D1/0676; G01; G01C; G01C23/00; G01C23/005; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1864638A
Cited
US1787992A
Cited
DE501963C
Cited
US2070178A
Cited
US2077398A
Cited
US2133241A
Cited
US2196139A
Cited
US2179570A
Cited
US2366939A
Cited
US2216716A
Cited
US2280126A
Cited
US2206036A
Cited
US2361956A
Cited
US2297534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |