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US2025561A
Expired / Lapsed
US
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Gyroplane
Assignee: Individual
•
Filing: 1931-10-30
•
Granted: 1935-12-24
•
Expires: 1951-10-30
Abstract
No abstract record available.
Inventors
- 👤 Wilford Edward Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:51
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54; B64C27/58; B64C27/59; B64C27/615; Y; Y02; Y02T; Y02T50/00; Y02T50/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-12-23 | 1939-06-24 | 1939-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-12-23 | 1943-06-24 | 1943-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-12-23 | 1947-06-24 | 1947-12-24 | $7700.00 | Window Closed / Lapsed |