US2554938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amphibian helicopter
Assignee: Individual
•
Filing: 1946-07-01
•
Granted: 1951-05-29
•
Expires: 1966-07-01
Abstract
No abstract record available.
Inventors
- 👤 Joseph D Catalano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:27
CPC Classifications
B; B60; B60F; B60F3/00; B62; B62D; B62D57/00; B62D57/04; B64; B64C; B64C37/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US859274A
Cited
US1151172A
Cited
US1355990A
Cited
US1541534A
Cited
US2070610A
Cited
US2096599A
Cited
US2135073A
Cited
CH198878A
Cited
US2338935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |