Patent US2685345A successfully refreshed from Google Patents.
US2685345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: Individual
•
Filing: 1952-03-12
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Granted: 1954-08-03
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Expires: 1972-03-12
Abstract
No abstract record available.
Inventors
- 👤 Frank W Lindner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:47
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/28; B; B01; B01D; B01D46/00; B01D46/10
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) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |