US3760945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure filter
Assignee: Envirotech Corp
•
Filing: 1971-10-12
•
Granted: 1973-09-25
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Expires: 1991-10-12
Abstract
Abstract An endless web filter medium zig-zags through a stack of superposed, spaced-apart, stationary filter press units mounted in a frame. Each press unit includes a stationary upper section which receives a reciprocatory ring; the ring carries a flexible diaphragm fixed to its periphery thereby forming a first chamber between the diaphragm and the upper section. The web may be supported by a drainage grid formed on the stationary section of the unit below. Actuating means extend the ring downwardly to contact the web below to form a filtration chamber overlying the web. Slurry is introduced and contained in the filtration chamber overlying the web. Slurry is introduced and contained in the filtration chamber overlying the web. Fluid pressure is introduced into the first chamber to exert force against the diaphragm to press liquid from the slurry in the filtration chamber through the web while forming a cake of solids thereon. Then, the fluid pressure may be released while the actuating means retracts the ring, and the web carries the cake from the press units to a remote discharge.
Inventors
- 👤 S Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:16
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D25/00; B01D25/003; B01D25/12; B01D25/127; B01D25/28; B01D25/282; B01D25/284; B01D25/285; B30; B30B; B30B9/00; B30B9/02; B30B9/22
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
50 words
A filter apparatus comprising: A. A rigid structural frame; B. A plurality of vertically arranged filter presses mounted on said frame and an endless belt of filter medium supported by said frame and trained to pass in zig-zag fashion from one press to the next, each of said presses comprising:
Claim 2
Dependent Claim
50 words
A filter apparatus comprising: A. A rigid structural frame; B. A plurality of vertically arranged filter presses mounted on said frame and an endless belt of filter medium supported by said frame and trained to pass in zig-zag fashion from one press to the next, each of said presses comprising:
Claim 3
Dependent Claim
9 words
An impervious first plate horizontally fixed to said frame;
Claim 4
Dependent Claim
9 words
An impervious first plate horizontally fixed to said frame;
Claim 5
Dependent Claim
46 words
A second plate horizontally fixed to said frame and spaced apart from said first plate in face-to-face relation thereto, thereby defining an open space therebetween; the surface of said second plate facing said first plate having ports formed therein which communicate with outlet means for filtrate;
Claim 6
Dependent Claim
46 words
A second plate horizontally fixed to said frame and spaced apart from said first plate in face-to-face relation thereto, thereby defining an open space therebetween; the surface of said second plate facing said first plate having ports formed therein which communicate with outlet means for filtrate;
Claim 7
Dependent Claim
89 words
A filter apparatus according to claim 1 wherein said means permitting selective movement of said endless wall comprises: a. An annular diaphragm which is sealingly fixed concentrically about the periphery of said endless wall and which is also fixed to said first plate to support said endless wall therefrom; and b. Second inlet means in said first plate communicating with one side of said annular diaphragm to introduce fluid under pressure against said annular diaphragm thereby to selectively move said endless wall toward and away from said second plate.
Claim 8
Dependent Claim
46 words
A second plate horizontally fixed to said frame and spaced apart from said first plate in face-to-face relation thereto, thereby defining an open space therebetween; the surface of said second plate facing said first plate having ports formed therein which communicate with outlet means for filtrate;
Claim 9
Dependent Claim
46 words
A second plate horizontally fixed to said frame and spaced apart from said first plate in face-to-face relation thereto, thereby defining an open space therebetween; the surface of said second plate facing said first plate having ports formed therein which communicate with outlet means for filtrate;
Claim 10
Dependent Claim
26 words
Means mounted on said frame adjacent said second plates whereby sections of said filter medium belt may be indexed across said surface of said second plate;
Claim 11
Dependent Claim
26 words
Means mounted on said frame adjacent said second plates whereby sections of said filter medium belt may be indexed across said surface of said second plate;
Claim 12
Dependent Claim
58 words
A filter apparatus according to claim 1 wherein said means to selectively move said endless wall comprises a matching endless slot formed in said first plate for receiving said endless wall, and fluid inlet means communicate with said slot for introducing fluid under pressure thereto to act against the wall to move the same toward said second plate.
Claim 13
Dependent Claim
26 words
Means mounted on said frame adjacent said second plates whereby sections of said filter medium belt may be indexed across said surface of said second plate;
Claim 14
Dependent Claim
26 words
Means mounted on said frame adjacent said second plates whereby sections of said filter medium belt may be indexed across said surface of said second plate;
Claim 15
Dependent Claim
27 words
An endless wall which sealingly engages said first plate and which encompasses a substantial portion of that surface of said first plate which faces said second plate;
Claim 16
Dependent Claim
27 words
An endless wall which sealingly engages said first plate and which encompasses a substantial portion of that surface of said first plate which faces said second plate;
Claim 17
Dependent Claim
59 words
A filter apparatus according to claim 1 wherein each of said presses include means for sensing the position of said endless wall and control means associated with said means for indexing said filter medium, said control means being responsive to said sensing means to energize said indexing means only when said endless wall is retracted from said second plate.
Claim 18
Dependent Claim
27 words
An endless wall which sealingly engages said first plate and which encompasses a substantial portion of that surface of said first plate which faces said second plate;
Claim 19
Dependent Claim
27 words
An endless wall which sealingly engages said first plate and which encompasses a substantial portion of that surface of said first plate which faces said second plate;
Claim 20
Dependent Claim
21 words
Means connected to said endless wall to selectively move said wall toward and away from said surface of said second plate;
Claim 21
Dependent Claim
21 words
Means connected to said endless wall to selectively move said wall toward and away from said surface of said second plate;
Claim 22
Dependent Claim
26 words
A filter press according to claim 1, including valved conduit means cooperating with said feed means to seletively deliver air under pressure to said liquid-filtering chamber.
Claim 23
Dependent Claim
21 words
Means connected to said endless wall to selectively move said wall toward and away from said surface of said second plate;
Claim 24
Dependent Claim
21 words
Means connected to said endless wall to selectively move said wall toward and away from said surface of said second plate;
Claim 25
Dependent Claim
30 words
A flexible diaphragm sealingly connected to the periphery of said endless wall defining a fluid pressure chamber between said diaphragm, said endless wall and said surface of said first plate;
Claim 26
Dependent Claim
30 words
A flexible diaphragm sealingly connected to the periphery of said endless wall defining a fluid pressure chamber between said diaphragm, said endless wall and said surface of said first plate;
Claim 27
Dependent Claim
26 words
A filter press according to claim 5 further including valved conduit means cooperating with said feed means to selectively deliver wash fluid to said liquid-filtering chamber.
Claim 28
Dependent Claim
30 words
A flexible diaphragm sealingly connected to the periphery of said endless wall defining a fluid pressure chamber between said diaphragm, said endless wall and said surface of said first plate;
Claim 29
Dependent Claim
30 words
A flexible diaphragm sealingly connected to the periphery of said endless wall defining a fluid pressure chamber between said diaphragm, said endless wall and said surface of said first plate;
Claim 30
Dependent Claim
13 words
Inlet means for introducing fluid under pressure into said first fluid pressure chamber;
Claim 31
Dependent Claim
13 words
Inlet means for introducing fluid under pressure into said first fluid pressure chamber;
Claim 32
Dependent Claim
40 words
A filter apparatus according to claim 1 including valve means associated with said feed means to selectively block delivery of feed into said liquid-filtering chamber of at least one of said presses while maintaining feed to the other said presses.
Claim 33
Dependent Claim
13 words
Inlet means for introducing fluid under pressure into said first fluid pressure chamber;
Claim 34
Dependent Claim
13 words
Inlet means for introducing fluid under pressure into said first fluid pressure chamber;
Claim 35
Dependent Claim
87 words
A liquid-filtering chamber defined by said endless wall when the same is moved toward said surface of said second plate whereby the lower peripheral edge of said endless wall sealingly engages a section of filter medium arranged on the surface of said second plates, said ports in the surface of said second plate being beneath the engaged section of filter medium, said endless wall defining the sidewall of said liquid-filtering chamber and said diaphragm defining a wall opposite said second plate which closes said liquid-filtering chamber; and
Claim 36
Dependent Claim
87 words
A liquid-filtering chamber defined by said endless wall when the same is moved toward said surface of said second plate whereby the lower peripheral edge of said endless wall sealingly engages a section of filter medium arranged on the surface of said second plates, said ports in the surface of said second plate being beneath the engaged section of filter medium, said endless wall defining the sidewall of said liquid-filtering chamber and said diaphragm defining a wall opposite said second plate which closes said liquid-filtering chamber; and
Claim 37
Dependent Claim
45 words
A filter apparatus according to claim 1 including means for sensing the position of said endless wall, and control means associated with said feed means and responsive to said sensing means to enable delivery of feed only when said wall is in the extended position.
Claim 38
Dependent Claim
87 words
A liquid-filtering chamber defined by said endless wall when the same is moved toward said surface of said second plate whereby the lower peripheral edge of said endless wall sealingly engages a section of filter medium arranged on the surface of said second plates, said ports in the surface of said second plate being beneath the engaged section of filter medium, said endless wall defining the sidewall of said liquid-filtering chamber and said diaphragm defining a wall opposite said second plate which closes said liquid-filtering chamber; and
Claim 39
Dependent Claim
87 words
A liquid-filtering chamber defined by said endless wall when the same is moved toward said surface of said second plate whereby the lower peripheral edge of said endless wall sealingly engages a section of filter medium arranged on the surface of said second plates, said ports in the surface of said second plate being beneath the engaged section of filter medium, said endless wall defining the sidewall of said liquid-filtering chamber and said diaphragm defining a wall opposite said second plate which closes said liquid-filtering chamber; and
Claim 40
Dependent Claim
137 words
Feed inlet means in said endless wall wherethrough fluid to be filtered is introduced into said liquid-filtering chamber while said endless wall is in position against said second plate; whereby solids are separated from the feed liquid by (1) the introduction of solids-bearing liquid feed into said liquidfiltering chamber thereby to express filtrate through the filter medium to discharge from said outlets concomittantly with the formation of a filter cake thereon, (2) said solids are further dried by the introduction of pressured fluid into said fluidpressure chamber to urge said flexible diaphragm toward said second plate pressing the cake thereagainst and solids are discharged from the filter by retraction of said endless wall followed by indexing of said filter belt to move the cake-laden portion from between said first and second plates to a point of discharge.
Claim 41
Dependent Claim
137 words
Feed inlet means in said endless wall wherethrough fluid to be filtered is introduced into said liquid-filtering chamber while said endless wall is in position against said second plate; whereby solids are separated from the feed liquid by (1) the introduction of solids-bearing liquid feed into said liquidfiltering chamber thereby to express filtrate through the filter medium to discharge from said outlets concomittantly with the formation of a filter cake thereon, (2) said solids are further dried by the introduction of pressured fluid into said fluidpressure chamber to urge said flexible diaphragm toward said second plate pressing the cake thereagainst and solids are discharged from the filter by retraction of said endless wall followed by indexing of said filter belt to move the cake-laden portion from between said first and second plates to a point of discharge.
Claim 42
Dependent Claim
137 words
Feed inlet means in said endless wall wherethrough fluid to be filtered is introduced into said liquid-filtering chamber while said endless wall is in position against said second plate; whereby solids are separated from the feed liquid by (1) the introduction of solids-bearing liquid feed into said liquid-filtering chamber thereby to express filtrate through the filter medium to discharge from said outlets concomittantly with the formation of a filter cake thereon, (2) said solids are further dried by the introduction of pressured fluid into said fluid-pressure chamber to urge said flexible diaphragm toward said second plate pressing the cake thereagainst and solids are discharged from the filter by retraction of said endless wall followed by indexing of said filter belt to move the cake-laden portion from between said first and second plates to a point of discharge.
Claim 43
Dependent Claim
137 words
Feed inlet means in said endless wall wherethrough fluid to be filtered is introduced into said liquid-filtering chamber while said endless wall is in position against said second plate; whereby solids are separated from the feed liquid by (1) the introduction of solids-bearing liquid feed into said liquid-filtering chamber thereby to express filtrate through the filter medium to discharge from said outlets concomittantly with the formation of a filter cake thereon, (2) said solids are further dried by the introduction of pressured fluid into said fluid-pressure chamber to urge said flexible diaphragm toward said second plate pressing the cake thereagainst and solids are discharged from the filter by retraction of said endless wall followed by indexing of said filter belt to move the cake-laden portion from between said first and second plates to a point of discharge.
Claim 44
Dependent Claim
53 words
A filter press according to claim 1 further including means to sense abnormal displacement of said first plate and said second plate and control means associated with said feed means responsive to said sensing means to block operatioN of said feed means when said first plate and said second plate are abnormally displaced.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |