US2437324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter steering surface control
Assignee: Individual
•
Filing: 1945-02-16
•
Granted: 1948-03-09
•
Expires: 1965-02-16
Abstract
No abstract record available.
Inventors
- 👤 Elden L Kirchoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:27
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/82
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1191501A
Cited
US1350982A
Cited
US1739703A
Cited
US1786576A
Cited
US2058678A
Cited
US2074805A
Cited
US2308802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-09 | 1951-09-08 | 1952-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-09 | 1955-09-08 | 1956-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-09 | 1959-09-08 | 1960-03-09 | $7700.00 | Window Closed / Lapsed |