US4990249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the desludging of baths
Assignee: HA WHITTEN & Co
•
Filing: 1990-02-27
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Granted: 1991-02-05
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Expires: 2010-02-27
Abstract
Abstract An apparatus for the desludging of baths includes a separation part with an oblique sieve filter containing a plurality of essentially horizontal slots. A side of the slots over which soiled liquid runs is covered by a filter cloth placed on the sieve plate and consisting of a polyester monofilament filter fabric with a mesh width smaller than the width of the slots between the sieve rods of the oblique sieve. The combination of the filter fabric of the filter cloth and the slots of the oblique sieve yields in spite of the filtering of small solid particles, a high liquid throughput.
Inventors
- 👤 Andreas Leuenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:55
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
Apparatus for the desludging of baths, in particular for the freeing of tick immersion baths for cows, from solid particles introduced by the animals, comprising: a suction tube immersible in liquid; a pump and a preliminary basin supplied by said pump, said basin being equipped with an overflow conducting the liquid to be purified to the upper edge of a sieve plate extending obliquely relative to the direction of gravity and retaining the solid particles, said plate being provided with a plurality of slots extending essentially transversely to the direction of flow; and, a collector basin located under the sieve plate for receiving the filtered liquid and connected by means of a drain with the bath, the sieve plate being designed to provide ribbed support for a filter cloth of a tight mesh plastic fabric placed upon it.
Claim 2
Dependent Claim
138 words
Apparatus for the desludging of baths, in particular for the freeing of tick immersion baths for cows, from solid particles introduced by the animals, comprising: a suction tube immersible in liquid; a pump and a preliminary basin supplied by said pump, said basin being equipped with an overflow conducting the liquid to be purified to the upper edge of a sieve plate extending obliquely relative to the direction of gravity and retaining the solid particles, said plate being provided with a plurality of slots extending essentially transversely to the direction of flow; and, a collector basin located under the sieve plate for receiving the filtered liquid and connected by means of a drain with the bath, the sieve plate being designed to provide ribbed support for a filter cloth of a tight mesh plastic fabric placed upon it.
Claim 3
Dependent Claim
20 words
Apparatus according to claim 1, wherein the filter cloth placed onto the sieve plate is a polyester monofilament filter fabric.
Claim 4
Dependent Claim
52 words
Apparatus according to claim 2, wherein the sieve plate comprises a plurality of sieve rods with triangular profiles, wherein the slots are larger at the discharging side of the sieve plate and have a minimum width amounting to a multiple of the mesh width of the filter fabric of the filter cloth.
Claim 5
Dependent Claim
41 words
Apparatus according to claim 3, wherein the width of the slots of the sieve plate is dimensioned from 250 to 1,500 micrometers and the mesh opening of the filter fabric of the filter cloth is dimensioned from 100 to 250 micrometers.
Claim 6
Dependent Claim
29 words
Apparatus according to claim 4, wherein the filter fabric has a mesh opening of approximately 177 micrometers and the sieve plate has a slot width of approximately 500 micrometers.
Claim 7
Dependent Claim
28 words
Apparatus according to claim 5, wherein an angle of inclination of the sieve plate with the filter cloth located on it is offset 20°to 50°relative to its vertical.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |