US2631676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet-propelled helicopter wing construction
Assignee: HILLER HELICOPTERS
•
Filing: 1949-12-27
•
Granted: 1953-03-17
•
Expires: 1969-12-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Stanley Hiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:41
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
FR423590A
Cited
US1099083A
Cited
US1519444A
Cited
FR648107A
Cited
US2397357A
Cited
US2469480A
Cited
US2464651A
Cited
US2462587A
Cited
US2485502A
Cited
US2472917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |