Patent US2421166A successfully refreshed from Google Patents.
US2421166A
Expired / Lapsed
US
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Means for giving warning of the formation of ice on aircraft
Assignee: Individual
•
Filing: 1942-04-24
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Granted: 1947-05-27
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Expires: 1962-04-24
Abstract
No abstract record available.
Inventors
- 👤 Sherlock John Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:25
CPC Classifications
B; B64; B64D; B64D15/00; B64D15/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-26 | 1950-11-25 | 1951-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-26 | 1954-11-25 | 1955-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-26 | 1958-11-25 | 1959-05-27 | $7700.00 | Window Closed / Lapsed |