Patent US2658665A successfully refreshed from Google Patents.
US2658665A
Expired / Lapsed
US
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Multistage fan for suction cleaners
Assignee: Hoover Co
•
Filing: 1950-12-07
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Granted: 1953-11-10
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Expires: 1970-12-07
Abstract
No abstract record available.
Inventors
- 👤 Donald B Tschudy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:01
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/441; A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; F04D17/00; F04D17/08; F04D17/16; F04D17/164
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US932297A
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GB131781A
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US1573973A
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US2135939A
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US2091537A
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US2333226A
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US2360211A
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US2401386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |