US2881854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purifier
Assignee: Individual
•
Filing: 1956-12-12
•
Granted: 1959-04-14
•
Expires: 1976-12-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Fred Henry Uehre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:56
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/12; B60; B60H; B60H3/00; B60H3/06; B60H3/0658; F; F02; F02M; F02M35/00; F02M35/02; F02M35/024; B60H2003/0691
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) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |