US2729304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning device for air filters
Assignee: Day Co
•
Filing: 1953-12-28
•
Granted: 1956-01-03
•
Expires: 1973-12-28
Abstract
No abstract record available.
Inventors
- 👤 Arden E Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:55
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/42; B01D46/4272; B01D46/66; B01D46/70; B01D46/72; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18152
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2594957A
Cited
US2333832A
Cited
US2316760A
Cited
US2415233A
Cited
US2495635A
Cited
US2661079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |