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US2575554A
Expired / Lapsed
US
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Vacuum cleaner with illuminating device
Assignee: Singer Co
•
Filing: 1948-12-11
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Granted: 1951-11-20
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Expires: 1968-12-11
Abstract
No abstract record available.
Inventors
- 👤 Langille Wilfred Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:03
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/28; A47L9/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1996934A
Cited
US2099172A
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US2093913A
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US2188809A
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US2228173A
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US2314334A
Cited
US2355183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |