US2843216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter and humidifier
Assignee: DARREL A RUSH
•
Filing: 1954-05-13
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Granted: 1958-07-15
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Expires: 1974-05-13
Abstract
No abstract record available.
Inventors
- 👤 William N Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:20
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0027; B01D46/0035; B01D46/24; B01D46/56; B01D46/62; B01D46/64; F; F02; F02M; F02M25/00; F02M25/022; F02M25/0221; F02M25/0225; F02M25/025; F02M25/028; F02M35/00; F02M35/02; F02M35/04; F02M35/042; F24; F24F; F24F6/00; F24F6/02; F24F6/04; B01D2279/00; B01D2279/60; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |