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US2561964A
Expired / Lapsed
US
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Air-flow control for vacuum cleaners
Assignee: Landers Frary and Clark
•
Filing: 1946-01-30
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Granted: 1951-07-24
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Expires: 1966-01-30
Abstract
No abstract record available.
Inventors
- 👤 Oscar M Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:32
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/0072; A47L5/00; A47L5/12; A47L5/22; A47L5/28; A47L5/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US562908A
Cited
US1209721A
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US1260282A
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US2064344A
Cited
US2126383A
Cited
US2221746A
Cited
US2244165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |