Patent US2621849A successfully refreshed from Google Patents.
US2621849A
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Axial flow fan with yieldingly centered fan element
Assignee: Joy Manufacturing Co
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Filing: 1949-05-25
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Granted: 1952-12-16
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Expires: 1969-05-25
Abstract
No abstract record available.
Inventors
- 👤 Harold F Minnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:44
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/60; F04D29/64; F04D29/644; F04D29/646
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB348446A
Cited
US1867365A
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US1927644A
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US2141648A
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US2100439A
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US2257804A
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US2264895A
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US2316389A
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US2294586A
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US2339565A
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US2397171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |