US3699747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cleaning filter elements of fabric filter equipment
Assignee: Individual
•
Filing: 1969-09-08
•
Granted: 1972-10-24
•
Expires: 1989-09-08
Abstract
Abstract A process and apparatus for cleaning the filter elements of a fabric filter equipment in which certain of the filter elements are recurrently shut off from the current dust-laden air, and at such time is exposed to the action of a clean air current under relatively higher pressure, thus causing the filter elements to move alternately in opposite directions. The apparatus includes intermittently rotatable valve means causing the filter elements to be subjected to suction for short times and alternately then to air under pressure for longer periods.
Inventors
- 👤 Gert Kroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:44
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/66; B01D46/70; B01D46/71; B01D46/02; B01D46/04; B01D46/42; B01D46/4272
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
37 words
The method as recited in claim 1, and controlling the lengths of said intervals of scavenging air flow so that the intervals of air flow in said opposite directIon are longer than those in said one direction.
Claim 2
Dependent Claim
41 words
The method as recited in claim 1, and controlling the relative pressures of the scavenging air flows through the fabric filter pocket so that they are greater during the periods of flow in said opposite direction than in said one direction.
Claim 3
Independent Claim
125 words
The method of removing dust from a flexible fabric filter pocket, wherein during normal filtration dust-laden air is fed to the outer side of the fabric filter pocket and filtered air is exhausted from the inner side of the fabric filter pocket so that the air, in being filtered, flows through the fabric from the outside in, said method comprising, periodically interrupting the filtration for predetermined intervals, feeding scavenging air through the fabric filter pocket during said intervals for a series of periods alternately from the outside in and then from the inside out, and controlling the flow of the scavenging air through the filter pocket so that it is greater during the periods of flow from the inside out than from the outside in.
Claim 4
Dependent Claim
32 words
The method recited in claim 4, and controlling the periods of flow of scavenging air so that the periods of flow from the inside out are longer than from the outside in.
Claim 5
Dependent Claim
36 words
The method recited in claim 4, and controlling the pressures of the scavenging air flows through the filter pocket so that they are greater during the periods of flow from inside out than from outside in.
References Cited (Backward Citations)
US1784339A
Cited
US2276805A
Cited
US3209521A
Cited
US3078646A
Cited
US3057137A
Cited
GB1009993A
Cited
US3385033A
Cited
US3430419A
Cited
US3513638A
Cited
US3535851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |