Patent US4285821A successfully refreshed from Google Patents.
US4285821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering method
Assignee: INTEREX A JOINT STOCK Co OF Ltd LIABILITY OF GERMANY GmbH
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Filing: 1979-08-01
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Granted: 1981-08-25
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Expires: 1999-08-01
Abstract
Abstract A method of and an apparatus for the filtering of a fluid in which a filter-aid agent of a particulate or fibrous character is floated onto and deposited upon a support fabric in a fluid. The medium to be filtered is then passed through the filter layer formed by this filter aid. The fabric divides the filter chamber into two compartments both of which are flushed with washing liquid which is discharged from the upstream compartment after back-washing through the fabric. During the filtration, a loss of the purified filtrate and a mixture with nonfiltered medium is precluded in that both compartments, after the filtering and cleaning phases, are completely discharged of fluid. The backwashing of the fabric is effected with another fluid.
Inventors
- 👤 Edwin Hiesinger
- 👤 Klaus Keplinger
- 👤 Hermann Nessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:23
CPC Classifications
C; C07; C07C; C07C255/00; B; B01; B01D; B01D29/00; B01D29/01; B01D29/62; B01D29/66; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
329 words
A method of filtering which comprises: (a) partitioning a filter chamber with a fluid-permeable planar support fabric into a single upstream compartment and a single downstream compartment, said planar support fabric forming a horizontal partition; (b) entraining onto said support fabric in said upstream compartment a particulate filter-aid layer by suspending particles of a filter-aid material in a carrier medium, introducing said carrier medium into said upstream compartment, and passing said carrier medium through said fabric whereby said particles form said layer; (c) discharging the carrier medium of step (b) from said chamber downstream of said support fabric, and removing any residues of the carrier medium completely from said chamber by a displacement fluid so that removal of carrier medium from said upstream compartment is completed prior to complete removal of carrier medium from said downstream compartment; (d) introducing a filterable medium into said upstream compartment, and passing said filterable medium through said layer and said support fabric from said upstream compartment to said downstream compartment, thereby depositing impurities contained in said filterable medium on said layer and enabling pure filtrate to enter said downstream compartment; (e) discharging the filterable medium of step (d) from said upstream compartment and discharging the pure filtrate downstream from said downstream compartment, and then drawing any residues of said filterable medium completely from said chamber by introducing said displacement fluid so that removal of such residues from said upstream compartment is completed prior to complete removal of the residues from the downstream compartment; (f) thereafter introducing a washing medium into said chamber and to the downstream side of said fabric and thereby backwashing said layer from said fabric and entraining material of said layer backwashed from said fabric out of said upstream compartment with the washing medium; (g) discharging the washing medium used in step (f) from said chamber and removing any residues of said washing medium completely from said chamber by said displacement fluid; and (h) thereafter repeating steps (b) through (g).
Claim 2
Independent Claim
329 words
A method of filtering which comprises: (a) partitioning a filter chamber with a fluid-permeable planar support fabric into a single upstream compartment and a single downstream compartment, said planar support fabric forming a horizontal partition; (b) entraining onto said support fabric in said upstream compartment a particulate filter-aid layer by suspending particles of a filter-aid material in a carrier medium, introducing said carrier medium into said upstream compartment, and passing said carrier medium through said fabric whereby said particles form said layer; (c) discharging the carrier medium of step (b) from said chamber downstream of said support fabric, and removing any residues of the carrier medium completely from said chamber by a displacement fluid so that removal of carrier medium from said upstream compartment is completed prior to complete removal of carrier medium from said downstream compartment; (d) introducing a filterable medium into said upstream compartment, and passing said filterable medium through said layer and said support fabric from said upstream compartment to said downstream compartment, thereby depositing impurities contained in said filterable medium on said layer and enabling pure filtrate to enter said downstream compartment; (e) discharging the filterable medium of step (d) from said upstream compartment and discharging the pure filtrate downstream from said downstream compartment, and then drawing any residues of said filterable medium completely from said chamber by introducing said displacement fluid so that removal of such residues from said upstream compartment is completed prior to complete removal of the residues from the downstream compartment; (f) thereafter introducing a washing medium into said chamber and to the downstream side of said fabric and thereby backwashing said layer from said fabric and entraining material of said layer backwashed from said fabric out of said upstream compartment with the washing medium; (g) discharging the washing medium used in step (f) from said chamber and removing any residues of said washing medium completely from said chamber by said displacement fluid; and (h) thereafter repeating steps (b) through (g).
Claim 3
Dependent Claim
19 words
The method defined in claim 1 wherein the carrier medium of step (b) is different from the filterable medium.
Claim 4
Dependent Claim
23 words
The method defined in claim 1 or 2 wherein subsequent to step (d) and prior to step (e), said filter chamber is sterilized.
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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |