US2565690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner
Assignee: AIR APPLIANCES Inc
•
Filing: 1948-07-29
•
Granted: 1951-08-28
•
Expires: 1968-07-29
Abstract
No abstract record available.
Inventors
- 👤 Ketelsen Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:02
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0027; B01D46/003; B01D46/0031; B01D46/24; B01D46/2403; B01D2275/00; B01D2275/20; B01D2275/201
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |