US2548942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: Electrolux Corp
•
Filing: 1947-06-06
•
Granted: 1951-04-17
•
Expires: 1967-06-06
Abstract
No abstract record available.
Inventors
- 👤 Raymond L Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:23
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/12; A47L9/122; B; B01; B01D; B01D46/00; B01D46/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1581450A
Cited
FR638692A
Cited
GB394796A
Cited
US2008067A
Cited
US2035097A
Cited
US2324838A
Cited
US2156857A
Cited
US2353717A
Cited
US2433727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |