Patent US2844354A successfully refreshed from Google Patents.
US2844354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor blade and method of making same
Assignee: Cincinnati Testing and Research Laboratories
•
Filing: 1954-04-08
•
Granted: 1958-07-22
•
Expires: 1974-04-08
Abstract
No abstract record available.
Inventors
- 👤 Elmer P Warnken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:57
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; B; B23; B23P; B23P15/00; B23P15/006; F01D5/02; F01D5/021; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044; Y10T29/00; Y10T29/37; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49327; Y10T442/00; Y10T442/60; Y10T442/659; Y10T442/67
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB190721756A
Cited
US1298524A
Cited
US1561765A
Cited
US1912931A
Cited
US2417586A
Cited
US2559013A
Cited
US2500598A
Cited
US2717554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |