US2423973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft bearing
Assignee: De Havilland Aircraft Co Ltd
•
Filing: 1943-08-31
•
Granted: 1947-07-15
•
Expires: 1963-08-31
Abstract
No abstract record available.
Inventors
- 👤 Halford Frank Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:42
CPC Classifications
F; F16; F16C; F16C35/00; F16C35/04; F01; F01D; F01D25/00; F01D25/16; F16C21/00; F16C39/00; F16C39/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1255378A
Cited
DE558016C
Cited
US1991614A
Cited
US2196952A
Cited
US2255662A
Cited
US2142632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-14 | 1951-01-13 | 1951-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-14 | 1955-01-13 | 1955-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-14 | 1959-01-13 | 1959-07-15 | $7700.00 | Window Closed / Lapsed |