Patent US2978167A successfully refreshed from Google Patents.
US2978167A
Expired / Lapsed
US
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Fan unit with a removable blade assembly
Assignee: CANYON SWI Inc
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Filing: 1957-11-08
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Granted: 1961-04-04
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Expires: 1977-11-08
Abstract
No abstract record available.
Inventors
- 👤 Alonzo M Harp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:33
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/263; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53796; Y10T29/5383
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1685408A
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US1986176A
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US2397171A
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US2407471A
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US2439692A
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US2671262A
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US2665841A
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US2754574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |