US2853589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical de-icing equipment
Assignee: Napier Turbochargers Ltd
•
Filing: 1954-11-01
•
Granted: 1958-09-23
•
Expires: 1974-11-01
Abstract
No abstract record available.
Inventors
- 👤 Harold F Crooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:46
CPC Classifications
B; B64; B64D; B64D15/00; B64D15/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US684628A
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US2590944A
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US2552955A
Cited
US2762897A
Cited
DE906661C
Cited
US2791668A
Cited
GB725125A
Cited
US2741692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |