Patent US2989268A successfully refreshed from Google Patents.
US2989268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convertible aircraft
Assignee: Individual
•
Filing: 1953-01-27
•
Granted: 1961-06-20
•
Expires: 1973-01-27
Abstract
No abstract record available.
Inventors
- 👤 Edward F Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:23
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/22; B64C27/26; B64C29/00; B64C29/0008; B64C29/0016
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |