Patent US3741389A successfully refreshed from Google Patents.
US3741389A
Expired / Lapsed
US
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Filtering apparatus
Assignee: Atlantic Richfield Co
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Filing: 1971-11-24
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Granted: 1973-06-26
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Expires: 1991-11-24
Abstract
Abstract An adherent filter cake is removed from areas of a filter cloth by progressively suspending the cloth and beating the reverse side. The beater bars are shaped in undulations so that different bars strike different points across the width of the cloth.
Inventors
- 👤 H Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:58
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/44; B01D33/46; B01D33/466; B01D29/00; B01D29/09; B01D33/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
The apparatus of claim 1 wherein said cloth forms an endless band.
Claim 2
Independent Claim
151 words
The method of filtering an aqueous slurry comprising particles tending to adhere to filter cloth comprising the steps of: A. advancing an elongated filter cloth through a filtration zone and therein precipitating an adherent filter cake comprising said particles upon said cloth, B. progressively suspending areas of said cloth above a deposition zone for said cake, and C. progressively mechanically beating said areas on the side of said cloth opposite said cake with a beater means comprising a plurality of undulatory means mounted on a rotating frame, the undulations of at least one of said undulatory means being out of phase with the undulations of at least one other of said undulatory means, said beating applying impacts to separated points across the width of said cloth and succeeding impacts of said beating being applied to laterally different of said points, thereby loosening said cake from said cloth within said deposition zone.
Claim 3
Dependent Claim
11 words
The method of claim 3 wherein said particles comprise copper oxides.
Claim 4
Dependent Claim
17 words
The method of claim 3 wherein said slurry comprises an oil emulsion and particles of copper oxide.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |