Patent US2429975A successfully refreshed from Google Patents.
US2429975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amphibian supporting and propelling structure for aircraft and the like
Assignee: Individual
•
Filing: 1943-07-27
•
Granted: 1947-11-04
•
Expires: 1963-07-27
Abstract
No abstract record available.
Inventors
- 👤 Harold T Avery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:53
CPC Classifications
B; B64; B64C; B64C35/00; B64C35/008
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USRE21120E
Cited
US1110156A
Cited
DE302640C
Cited
FR463502A
Cited
US1214536A
Cited
US1331221A
Cited
GB143591A
Cited
US1405407A
Cited
US1408899A
Cited
GB228245A
Cited
US1710869A
Cited
US1780298A
Cited
US1930922A
Cited
US1879700A
Cited
US2023312A
Cited
FR797803A
Cited
US2135073A
Cited
US2223855A
Cited
US2279074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-03 | 1951-05-05 | 1951-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-03 | 1955-05-05 | 1955-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-03 | 1959-05-05 | 1959-11-04 | $7700.00 | Window Closed / Lapsed |