Patent US2478847A successfully refreshed from Google Patents.
US2478847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convertible helicopter-airplane
Assignee: Motors Liquidation Co
•
Filing: 1944-10-06
•
Granted: 1949-08-09
•
Expires: 1964-10-06
Abstract
No abstract record available.
Inventors
- 👤 Stuart Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:55
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0016; B64C29/0033
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1007810A
Cited
FR421051A
Cited
US1414241A
Cited
US1871015A
Cited
US1971734A
Cited
US1950915A
Cited
US1977392A
Cited
US2230370A
Cited
US2135073A
Cited
US2280654A
Cited
US2284902A
Cited
US2359265A
Cited
US2350126A
Cited
US2364871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-08 | 1953-02-07 | 1953-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-08 | 1957-02-07 | 1957-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-08 | 1961-02-07 | 1961-08-09 | $7700.00 | Window Closed / Lapsed |