Patent US2739655A successfully refreshed from Google Patents.
US2739655A
Expired / Lapsed
US
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Variable pitch fan
Assignee: Hudson Engineering Corp
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Filing: 1951-12-17
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Granted: 1956-03-27
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Expires: 1971-12-17
Abstract
No abstract record available.
Inventors
- 👤 Petty Macon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:32
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; F04D29/36; F04D29/362; F04D27/00; F04D27/002
Claims Analysis
Total Claims: 0
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GB569867A
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US2473697A
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US2438542A
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US2457609A
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US2539339A
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US2514097A
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US2553214A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |