Patent US2551455A successfully refreshed from Google Patents.
US2551455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter
Assignee: PENNINE AIRCRAFT Ltd
•
Filing: 1947-05-15
•
Granted: 1951-05-01
•
Expires: 1967-05-15
Abstract
No abstract record available.
Inventors
- 👤 Neale John Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:06
CPC Classifications
B; B64; B64C; B64C37/00; B64C27/00; B64C27/04; B64C27/08; B64C27/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1491310A
Cited
US2185277A
Cited
US2156334A
Cited
US2395143A
Cited
US2410978A
Cited
US2382373A
Cited
US2477501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |