US1389925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Captive flying-machine of the helicopter type
Assignee: Individual
•
Filing: 1920-03-09
•
Granted: 1921-09-06
•
Expires: 1940-03-09
Abstract
No abstract record available.
Inventors
- 👤 Zurovec Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:53
CPC Classifications
B; B64; B64U; B64U2201/00; B64U2201/20; B64U2201/202; B64U50/00; B64U50/10; B64U50/11
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) | 1924-09-05 | 1925-03-07 | 1925-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-09-05 | 1929-03-07 | 1929-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-09-05 | 1933-03-07 | 1933-09-06 | $7700.00 | Window Closed / Lapsed |