Patent US2944609A successfully refreshed from Google Patents.
US2944609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter power transmission system
Assignee: RTX Corp
•
Filing: 1956-06-01
•
Granted: 1960-07-12
•
Expires: 1976-06-01
Abstract
No abstract record available.
Inventors
- 👤 Igor I Sikorsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:11
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/36; B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2392622A
Cited
GB634332A
Cited
US2687779A
Cited
US2653778A
Cited
FR1029081A
Cited
US2755038A
Cited
US2689615A
Cited
US2747364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |