US2540472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically heated blade and process of manufacture
Assignee: AV Roe Canada Ltd
•
Filing: 1949-05-02
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Granted: 1951-02-06
•
Expires: 1969-05-02
Abstract
No abstract record available.
Inventors
- 👤 Boyd Winnett
- 👤 George F Kelk
- 👤 John E Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:13
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1525460A
Cited
US1807359A
Cited
US1737912A
Cited
US1951846A
Cited
US2110621A
Cited
US2227931A
Cited
US2309682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |