Patent US2504846A successfully refreshed from Google Patents.
US2504846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner with auxiliary suction tube and automatically controlled brush drive
Assignee: Individual
•
Filing: 1944-08-16
•
Granted: 1950-04-18
•
Expires: 1964-08-16
Abstract
No abstract record available.
Inventors
- 👤 James B Kirby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:42
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; A47L5/28; A47L5/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1217817A
Cited
US1458939A
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US1498383A
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US1726592A
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US1937766A
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US1904973A
Cited
US1984191A
Cited
US2166863A
Cited
US2175004A
Cited
US2287922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |