Patent US2658229A successfully refreshed from Google Patents.
US2658229A
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Suction cleaning tool having an air pressure actuated nozzle area varying means
Assignee: Hoover Co
•
Filing: 1948-10-27
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Granted: 1953-11-10
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Expires: 1968-10-27
Abstract
No abstract record available.
Inventors
- 👤 Donald G Smellie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:49
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/02; A47L9/06; A47L9/0633; A47L9/064; A47L9/0653
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE667452C
Cited
US1055771A
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US1129817A
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FR464374A
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US1519192A
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US1471671A
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DE467730C
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US1925354A
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AT116997B
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US1908284A
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US1970290A
Cited
US1904974A
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US2275357A
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US2314081A
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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) | 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 |