US2781998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bladed rotors
Assignee: CENTRAX POWER UNITS Ltd
•
Filing: 1951-03-02
•
Granted: 1957-02-19
•
Expires: 1971-03-02
Abstract
No abstract record available.
Inventors
- 👤 Richard H H Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:01
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3007; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49321
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1039915A
Cited
GB190815893A
Cited
US1142690A
Cited
US1250005A
Cited
US1279800A
Cited
GB369127A
Cited
US1890581A
Cited
US1919970A
Cited
US2255486A
Cited
GB555135A
Cited
US2337700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |