US3688780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter cleaning method
Assignee: HERBERT L EVERROAD
•
Filing: 1971-03-19
•
Granted: 1972-09-05
•
Expires: 1991-03-19
Abstract
Abstract A method for cleaning air filters of the accordion folded paper type comprises spraying liquid over the filter wall on the side opposite the collected residue, concurrently passing air through the filter in the same direction, then discontinuing the flow when the discharged liquid is clear and similarly producing flows of liquid and air through the filter in the opposite direction and discontinuing when the liquid is clear.
Inventors
- 👤 Herbert L Everroad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:59
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/2411; B01D41/00; B01D41/04; B01D46/26; B01D46/52; B01D46/521; B01D46/66; B01D46/70; B01D46/72; B01D46/79; B01D2279/00; B01D2279/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
33 words
The method of claim 1 including the step of continuing the flow of air through the filter element toward said opposite side for a time sufficient to remove excess liquid from the element.
Claim 2
Dependent Claim
35 words
The method of claim 1 wherein the flow of air is effected by reducing the pressure of the air on the side of the filter element toward which the air and liquid are to flow.
Claim 3
Dependent Claim
25 words
The method of claim 1 including the initial step of soaking the filter in a cleaning solution capable of loosening the residue on the filter.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |