US2665090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller ice-prevention heating unit
Assignee: Individual
•
Filing: 1950-08-03
•
Granted: 1954-01-05
•
Expires: 1970-08-03
Abstract
No abstract record available.
Inventors
- 👤 George H Holdaway
- 👤 Elwyn C Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:17
CPC Classifications
B; B64; B64D; B64D15/00; B64D15/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1846468A
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US2202820A
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US2393635A
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US2454874A
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US2552075A
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US2406367A
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US2496279A
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US2487658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |