US4608164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membrane filter plate
Assignee: JV KUNSTOFFWERK OBERE LERCH 2 8544 GEORGENSGMUND GmbH
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Filing: 1985-01-31
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Granted: 1986-08-26
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Expires: 2005-01-31
Abstract
Abstract A membrane filter press comprises a plurality of one piece plastic base plates having on opposite sides recesses each bounded by a lower inner peripheral portion surrounded by a higher outer peripheral portion. In the lower inner peripheral portion of the base plate there is a circumferential groove. On each side of the base plate there is a membrane of elastomeric material. The membrane is planar in unstressed condition and has a marginal portion seated on the lower inner peripheral portion of the base plate. A rib on the membrane is received in the circumferential groove of the base plate. An inlet for a suspension to be filtered provides inlet passages into spaces between filter cloths of adjacent filter units. At a position for filtrate outlet, passages in the membrane and the base plate connect with a filtrate outlet opening. Passages are provided in the base plate for introducing compressed air between the base plate and the membrane to compress the filtered-out solids into a filter cake at the end of a filtering cycle.
Inventors
- 👤 Werner Neu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:40
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/12; B01D25/21; B01D25/215; B01D25/28; B01D25/282; B01D25/285; B01D25/30; B01D25/305
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
159 words
A membrane filter press comprises a plurality of membranes of elastomeric material sandwiched between base plates, each of said base plates having a central recess bounded by an inclined surface sloping up to a lower inner peripheral portion surrounded by a higher outer peripheral portion and having a circumferential groove adjacent the boundary between said inclined surface and said lower inner peripheral portion, and each of said membranes being substantially planar non-cup-shaped in unstressed condition and having a marginal portion seating on said lower inner peripheral portion of said base plate and having a thickness slightly greater than the difference in height between said lower inner peripheral portion and said higher outer peripheral portion, and a circumferential rib received in said groove of said base plate, surfaces of said higher outer peripheral portions of adjacent base plates seating on one another in compressed condition of said press and constitution sealing surfaces providing a pressure seal between adjacent base plates.
Claim 2
Dependent Claim
159 words
A membrane filter press comprises a plurality of membranes of elastomeric material sandwiched between base plates, each of said base plates having a central recess bounded by an inclined surface sloping up to a lower inner peripheral portion surrounded by a higher outer peripheral portion and having a circumferential groove adjacent the boundary between said inclined surface and said lower inner peripheral portion, and each of said membranes being substantially planar non-cup-shaped in unstressed condition and having a marginal portion seating on said lower inner peripheral portion of said base plate and having a thickness slightly greater than the difference in height between said lower inner peripheral portion and said higher outer peripheral portion, and a circumferential rib received in said groove of said base plate, surfaces of said higher outer peripheral portions of adjacent base plates seating on one another in compressed condition of said press and constitution sealing surfaces providing a pressure seal between adjacent base plates.
Claim 3
Dependent Claim
45 words
A membrane filter press according to claim 1, in which said base plate has an inclined under-cut shoulder between said lower inner peripheral portion and said higher outer peripheral portion and in which the marginal edge of said diaphragm is wedge-shaped and abuts said shoulder.
Claim 4
Dependent Claim
34 words
A membrane filter press according to claim 1, in which opposite side walls of said rib of said membrane and side walls of said groove of said base plate are parallel to one another.
Claim 5
Dependent Claim
36 words
A membrane filter press according to claim 1, in which side walls of said rib of said membrane and side walls of said groove of said base plate are perpendicular to the plane of said membrane.
Claim 6
Dependent Claim
61 words
A membrane filter press according to claim 1, in which an inlet opening in said base plate and membrane is surrounded by an annular rib of said membrane received in an annular groove in said base plate, and in which a filter cloth and said membrane are clamped on said base plate by a screwed joint disposed in said inlet opening.
Claim 7
Dependent Claim
79 words
A membrane filter press according to claim 5, in which said screwed joint comprises two flanged pipe pieces joined by an intermediate pipe piece having at one end an externally threaded portion screwed into internal threads of one of said flanged pipe pieces and at the other end a flange received in an annular recess of the other of said flanged pipe pieces, whereby said other flanged pipe piece is rotatable and axially movable on said intermediate pipe piece.
Claim 8
Dependent Claim
82 words
A membrane filter press according to claim 6, in which flanges of said flanged pipe pieces are so thick that in free condition they extend at least to the planes of said outer peripheral portions of said base plate, whereby end faces of said flanges engage end faces of flanges of adjacent screwed joints in assembled condition of the press, and in which said flanges have at least one radial recess providing an inlet flow passage to the interior of said press.
Claim 9
Dependent Claim
18 words
A membrane filter press according to claim 6, in which the three-piece screwed joints are of plastic material.
Claim 10
Dependent Claim
36 words
A membrane filter press according to claim 6, in which on the inner face of the flange of said flanged pipe pieces there is at least one annular projection pressed against said filter cloth and membrane.
Claim 11
Dependent Claim
41 words
A membrane filter press according to claim 5, in which said base plate has said recesses on both sides and in which two membranes and two filter cloths are clamped on opposite sides of said base plate by said screwed joint.
Claim 12
Dependent Claim
19 words
A membrane filter press according to claim 1, in which said base plate is molded one-piece of plastic material.
Claim 13
Dependent Claim
40 words
A membrane filter press according to claim 1, in which said rib of said membrane has a height less than the depth of said groove of said base plate whereby there is a space at the bottom of said groove.
Claim 14
Dependent Claim
36 words
A membrane filter press according to claim 1, in which said rib of said membrane has on at least one side at least one sealing lip engaging a side of said groove in said base plate.
Claim 15
Dependent Claim
35 words
A membrane filter press according to claim 1, in which said base plate has said recesses on both sides and in which membranes and filter cloth are disposed on opposite sides of the base plate.
Claim 16
Dependent Claim
78 words
A membrane filter press according to claim 1, in which adjacent a filtrate oulet opening, said marginal portion of said membrane is divided into an outer web portion and an inner web portion with a recess between them, said inner web portion being traversed by a plurality of channels leading from the interior of the press to said recess, and in which a discharge passage is provided for conducting filtrate from said recess to said filtrate outlet opening.
Claim 17
Dependent Claim
29 words
A membrane filter press according to claim 15, in which portions of said inner web portion between said channels extend toward the interior of said press as tapered tongues.
Claim 18
Dependent Claim
28 words
A membrane filter press according to claim 15, in which said discharge passage comprises an outlet opening in said membrane and a communicating passage in said base plate.
Claim 19
Dependent Claim
30 words
A membrane filter press according to claim 17, in which an annular rib on said membrane surrounding said outlet opening is received in an annular groove in said base plate.
Claim 20
Dependent Claim
29 words
A membrane filter press according to claim 1, in which said base plate is provided with a pasaage for introducing compressed air between the base plate and the membrane.
Claim 21
Dependent Claim
44 words
A membrane filter press according to claim 1, in which said membrane has on the side facing away from the base plate in an area overlying said recess of the base plate a multiplicity of small projections distributed over the surface of said membrane.
Claim 22
Dependent Claim
42 words
A member filter press according to claim 1, in which the said groove of said base plate has a width at its outer portion at least as great as the width at its inner portion whereby said groove is free of undercut.
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) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |