Patent US2835456A successfully refreshed from Google Patents.
US2835456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control mechanism for a convertible aircraft
Assignee: Convertawings Inc
•
Filing: 1954-07-13
•
Granted: 1958-05-20
•
Expires: 1974-07-13
Abstract
No abstract record available.
Inventors
- 👤 David H Kaplan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:17
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0091; B64C13/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |