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US2784556A
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Anemo-electric power plants
Assignee: De Havilland Propellers Ltd
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Filing: 1955-02-28
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Granted: 1957-03-12
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Expires: 1975-02-28
Abstract
No abstract record available.
Inventors
- 👤 Perdue Robert John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:45
CPC Classifications
F; F03; F03D; F03D1/00; F03D13/00; F03D13/20; F03D80/00; F03D80/70; F03D9/00; F03D9/20; F03D9/25; F05; F05B; F05B2260/00; F05B2260/60; F05B2260/601; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72; Y02E10/728; Y10; Y10S; Y10S416/00; Y10S416/04
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) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |