US3648844A - Plastic filter leaf with separator channels - Google Patents

Plastic filter leaf with separator channels Download PDF

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Publication number
US3648844A
US3648844A US844574A US3648844DA US3648844A US 3648844 A US3648844 A US 3648844A US 844574 A US844574 A US 844574A US 3648844D A US3648844D A US 3648844DA US 3648844 A US3648844 A US 3648844A
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US
United States
Prior art keywords
leaf
filter
leaf member
faces
hub
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US844574A
Inventor
John E Krynski
Ernie G Seggebruch
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KETEMA Inc 2233 STATE RD BENSALEM PA 19020 A DE CORP
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Ametek Inc
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Assigned to KETEMA, INC., 2233 STATE RD., BENSALEM, PA 19020, A DE CORP. reassignment KETEMA, INC., 2233 STATE RD., BENSALEM, PA 19020, A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMETEK, INC.
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/39—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/39—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type
    • B01D29/41—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type mounted transversely on the tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • B01D33/23—Construction of discs or component sectors thereof

Definitions

  • a filter leaf assembly which may be used in either a horizontal rotary leaf filter or a vertical filter.
  • the filter leaf assembly comprises a leaf member of a synthetic plastic material with both faces of the leaf member being provided with a regular pattern of closely spaced cylindrical projections. The projections are integral with the leaf member. Filter media are mounted on both faces of the leaf member over these cylindrical projections.
  • the leaf member may be circular and mounted upon a hub having passages therein communicating with both sides of the leaf member.
  • the leaf member may be rectangular and a hose connection attached along one edge thereof to communicate with both faces of the leaf member.
  • a pressure filter device comprises a succession of filter plates which may be arranged horizontally or vertically.
  • the faces of the filter plates are provided with grooves or other passages and the faces are then covered with suitable filter media.
  • the liquid to be filtered is introduced upon the filter media with the filtrate passing through the filter media into the grooves on the filter plate surfaces.
  • the filter cake remaining on the filter media is then removed.
  • One of the problems in connection with such pressure filter devices is to provide on the filter plates uniform supporting surfaces for the filter media while at the same time providing as large a filter area as possible. It is also necessary that the supporting surfaces have relatively simple and uncomplicated passages therebetween so as to permit a free flow of the filtrate.
  • One of the objects of the present invention is to provide an improved filter leaf assembly for a pressure filter device.
  • Another of the objects of the present invention is to provide a filter leaf member having on both faces thereof uniform sup porting surfaces for filter media.
  • Another of the objects of the present invention is to provide a filter leaf member of a synthetic plastic material having integral projections on both faces thereof to form uniform supporting surfaces for filter media.
  • a filter leaf assembly may comprise a relatively thin leaf member of a synthetic plastic material having sufficient thickness to be structurally self-supporting and having opposed faces.
  • Each of the leaf member faces has a plurality of cylindrical projections thereon which are relatively closely spaced in a regular pattern.
  • the cylindrical projections are of a uniform height and are integral with the leaf member.
  • Filter media are positioned on both sides of the leaf faces and supported on the ends of these cylindrical projections.
  • the leaf member may be circular for use in a horizontal pressure filter device or may be rectangular with a hose connection at an edge thereof for use in a vertical pressure filter device.
  • FIG. 1 is a plan view of a circular filter leaf assembly according to the present invention with a portion of the filter media cut away;
  • FIG. 2 is an end view of the filter leaf assembly of FIG. 1;
  • FIG. 3 is an elevational view of the hub for the filter leaf assembly for FIG. 1 with the lower portion of the hub being shown in section;
  • FIG. 4 is an end view ofthe flanged end ofthe hub of FIG. 3;
  • FIG. 5 is a longitudinal sectional view of the compressor ring used in the assembly of the filter leaf member upon the hub;
  • FIG. 6 is a sectional view taken along the line 6--6 of FIG. 1 and in enlarged scale;
  • FIG. 7 is a sectional view taken along the lines 77 of FIG.
  • FIG. 8 is a plan view similar to that of FIG. 1 ofa rectangular filter leaf member for a vertical filter device
  • FIG. 9 is an end view of the filter leaf member of FIG. 8.
  • FIG. 10 is a sectional view taken along the line l0-l0 of FIG. 8 and in enlarged scale.
  • a filter leaf assembly according to the present invention is indicated generally at 10 in FIGS. 1 and 2.
  • the assembly comprises a relatively thin leaf member 11, as shown in FIG. 6, of a plastic material such as polypropylene.
  • the plastic may be of foamed plastic.
  • the member has a sufficient thickness to be structurally self-supporting and has opposed faces 12 and 13. Each face is provided with a plurality of cylindrical projections 14, shown in FIG. 7, which are relatively closely spaced in a regular pattern.
  • These cylindrical members are of a uniform height with their ends 15 presenting a supporting surface for a filter media 16.
  • the cylindrical projections are formed integrally with the member 11 as also shown in FIG. 7.
  • the projections 14 are arranged in a regular pattern as shown in FIG. 1 and present a substantially waffle-iron effeet.
  • the filter leaf member 10 is circular and is provided with a central opening 17 in which is mounted a hub 18.
  • the circular leaf member is intended for a horizontal rotary leaf filter device.
  • each face 12 and 13 there is provided a rib 19 with the radial face of the rib being of the same height as the cylindrical projections 14.
  • the uniform heights of the rib l9 and the projections 14, together with the close but regular spacing of the projections, provide a uniform supporting surface for the filter media 16.
  • An annular groove 20 is formed in the outer peripheral edge of the leaf member 11.
  • the filter media 16 may be a screen and/or cloth which covers both radial faces of the leaf member as shown in FIG. 6.
  • the outer edges of the filter media may be held within the peripheral groove 20 by suitable caulking 21.
  • a molded leaf binding 22 having a substantially U-shaped cross section is positioned about the peripheral edge of the leaf member 11 to retain the caulking and the peripheral edges of the filter media in position.
  • the binding may be in two sections as shown in FIG. 1 and clamped together at their ends as at 23.
  • the hub 18 is substantially cylindrical and has an external flange 24 at an end thereof.
  • the peripheral surface of the hub is provided with a pair of annular grooves 25 which communicate with the interior of the hub through openings 26.
  • Axial grooves 27 may be formed in the inner face of hub 18 and communicate with the openings 26.
  • the leaf member 11 with filter media 16 on both sides thereof is positioned over the hub against the flange 24.
  • the leaf member is held in this position by means of a compression ring 28 secured by bolt 29 which passes through openings in the leaf member 11 and the flange 24.
  • the compression ring 28 is provided with an annular groove in which is seated a Neoprene O-ring 30. It can be seen that when the leaf member is mounted upon the hub, the hub grooves 25 communicate with both faces 12 and 13 of the leaf member.
  • FIGS. 8-10 there is indicated generally at 31, a rectangular filter leaf assembly which is particularly adapted for a vertical filter device.
  • the construction of the filter leaf assembly 31 is substantially the same as that of the assembly 10 described above.
  • a hose or conduit connection 32 is attached to an edge of the leaf member.
  • the connection comprises a substantially channel-shaped member 33 provided with a longitudinal groove 34 which communicates with both faces of the leaf member as may be seen in FIG. 10.
  • the element 33 is secured to the leaf member by a plurality of rivets or bolts 35.
  • a hose or conduit connection 36 having a bore 37 is then secured to the element 33 to communicate with a bore 38 therein.
  • the regularly spaced cylindrical projections similarly function to provide a uniform supporting surface for the filter media positioned on both faces of the leaf member.
  • the leaf member is also formed of a synthetic plastic material such as polypropylene and the cylindrical projections are integral therewith.
  • a filter leaf assembly comprising a relatively thin circular leaf member of a plastic material having sufficient thickness to be structurally self-supporting and having opposed faces, a plurality of cylindrical projections relatively closely spaced in a regular pattern on each face, said projections being of a uniform height and integral with the respective faces, a peripheral rib on each face of said leaf member being of a height equal to said projections, a circumferential groove in the outer peripheral edge of said leaf member, caulking means in said circumferential groove, and filter media on each of said leaf faces and positioned on the ends of said projections and said ribs by said caulking means and by a generally U-shaped molded binding composed of two halves clamped around the peripheral edges of said filter media relative to said leaf assembly, said leaf member having a central opening with a hub positioned therein, said hub having an external flange on one end of said hub, and means for retaining said leaf member on said hub against said flange, annular grooves in the outer peripheral surface of said hub communicating with said spaced projections
  • a filter leaf assembly as claimed in claim 1 with said leaf member being rectangular and wherein said opening is in one edge thereof, and hose connection means attached to said edge to communicate with the cylindrical projections on both faces of the leaf member.

Abstract

A filter leaf assembly is disclosed which may be used in either a horizontal rotary leaf filter or a vertical filter. The filter leaf assembly comprises a leaf member of a synthetic plastic material with both faces of the leaf member being provided with a regular pattern of closely spaced cylindrical projections. The projections are integral with the leaf member. Filter media are mounted on both faces of the leaf member over these cylindrical projections. The leaf member may be circular and mounted upon a hub having passages therein communicating with both sides of the leaf member. The leaf member may be rectangular and a hose connection attached along one edge thereof to communicate with both faces of the leaf member.

Description

United States Patent Krynski et al.
[ Mar. 14, 1972 3,501,010 3/1970 Caitchelletal ..210/486X Primary Examiner-Samih N. Zaharna Assistant Examiner-Frederick F. Calvetti Attorney-Smythe & Moore [5 7] ABSTRACT A filter leaf assembly is disclosed which may be used in either a horizontal rotary leaf filter or a vertical filter. The filter leaf assembly comprises a leaf member of a synthetic plastic material with both faces of the leaf member being provided with a regular pattern of closely spaced cylindrical projections. The projections are integral with the leaf member. Filter media are mounted on both faces of the leaf member over these cylindrical projections. The leaf member may be circular and mounted upon a hub having passages therein communicating with both sides of the leaf member. The leaf member may be rectangular and a hose connection attached along one edge thereof to communicate with both faces of the leaf member.
3 Claims, 10 Drawing Figures PATENTEDMAR 14 I972 33, 5
sum 3 [1F 3 FlG.-8
ATTORNEYS PLASTIC FILTER LEAF WITH SEPARATOR CHANNELS One form of a pressure filter device comprises a succession of filter plates which may be arranged horizontally or vertically. The faces of the filter plates are provided with grooves or other passages and the faces are then covered with suitable filter media. The liquid to be filtered is introduced upon the filter media with the filtrate passing through the filter media into the grooves on the filter plate surfaces. The filter cake remaining on the filter media is then removed. One of the problems in connection with such pressure filter devices is to provide on the filter plates uniform supporting surfaces for the filter media while at the same time providing as large a filter area as possible. It is also necessary that the supporting surfaces have relatively simple and uncomplicated passages therebetween so as to permit a free flow of the filtrate.
One of the objects of the present invention is to provide an improved filter leaf assembly for a pressure filter device.
Another of the objects of the present invention is to provide a filter leaf member having on both faces thereof uniform sup porting surfaces for filter media.
Another of the objects of the present invention is to provide a filter leaf member of a synthetic plastic material having integral projections on both faces thereof to form uniform supporting surfaces for filter media.
According to one aspect of the present invention, a filter leaf assembly may comprise a relatively thin leaf member of a synthetic plastic material having sufficient thickness to be structurally self-supporting and having opposed faces. Each of the leaf member faces has a plurality of cylindrical projections thereon which are relatively closely spaced in a regular pattern. The cylindrical projections are of a uniform height and are integral with the leaf member. Filter media are positioned on both sides of the leaf faces and supported on the ends of these cylindrical projections. The leaf member may be circular for use in a horizontal pressure filter device or may be rectangular with a hose connection at an edge thereof for use in a vertical pressure filter device.
Other objects, advantages, and features of the present invention will be apparent from the accompanying description and drawings, which are merely exemplary.
In the drawings:
FIG. 1 is a plan view of a circular filter leaf assembly according to the present invention with a portion of the filter media cut away;
FIG. 2 is an end view of the filter leaf assembly of FIG. 1;
FIG. 3 is an elevational view of the hub for the filter leaf assembly for FIG. 1 with the lower portion of the hub being shown in section;
FIG. 4 is an end view ofthe flanged end ofthe hub of FIG. 3;
FIG. 5 is a longitudinal sectional view of the compressor ring used in the assembly of the filter leaf member upon the hub;
FIG. 6 is a sectional view taken along the line 6--6 of FIG. 1 and in enlarged scale;
FIG. 7 is a sectional view taken along the lines 77 of FIG.
FIG. 8 is a plan view similar to that of FIG. 1 ofa rectangular filter leaf member for a vertical filter device;
FIG. 9 is an end view of the filter leaf member of FIG. 8; and
FIG. 10 is a sectional view taken along the line l0-l0 of FIG. 8 and in enlarged scale.
Proceeding next to the drawings wherein like reference symbols indicate the same parts throughout the various views, a specific embodiment and modification of the present invention will be described in detail.
A filter leaf assembly according to the present invention is indicated generally at 10 in FIGS. 1 and 2. The assembly comprises a relatively thin leaf member 11, as shown in FIG. 6, of a plastic material such as polypropylene. In one form, the plastic may be of foamed plastic. The member has a sufficient thickness to be structurally self-supporting and has opposed faces 12 and 13. Each face is provided with a plurality of cylindrical projections 14, shown in FIG. 7, which are relatively closely spaced in a regular pattern. These cylindrical members are of a uniform height with their ends 15 presenting a supporting surface for a filter media 16. The cylindrical projections are formed integrally with the member 11 as also shown in FIG. 7. The projections 14 are arranged in a regular pattern as shown in FIG. 1 and present a substantially waffle-iron effeet.
The filter leaf member 10 is circular and is provided with a central opening 17 in which is mounted a hub 18. The circular leaf member is intended for a horizontal rotary leaf filter device.
At the peripheral edge of each face 12 and 13, there is provided a rib 19 with the radial face of the rib being of the same height as the cylindrical projections 14. The uniform heights of the rib l9 and the projections 14, together with the close but regular spacing of the projections, provide a uniform supporting surface for the filter media 16.
An annular groove 20 is formed in the outer peripheral edge of the leaf member 11.
The filter media 16 may be a screen and/or cloth which covers both radial faces of the leaf member as shown in FIG. 6. The outer edges of the filter media may be held within the peripheral groove 20 by suitable caulking 21. A molded leaf binding 22 having a substantially U-shaped cross section is positioned about the peripheral edge of the leaf member 11 to retain the caulking and the peripheral edges of the filter media in position. The binding may be in two sections as shown in FIG. 1 and clamped together at their ends as at 23.
The hub 18 is substantially cylindrical and has an external flange 24 at an end thereof. The peripheral surface of the hub is provided with a pair of annular grooves 25 which communicate with the interior of the hub through openings 26. Axial grooves 27 may be formed in the inner face of hub 18 and communicate with the openings 26.
The leaf member 11 with filter media 16 on both sides thereof is positioned over the hub against the flange 24. The leaf member is held in this position by means of a compression ring 28 secured by bolt 29 which passes through openings in the leaf member 11 and the flange 24. The compression ring 28 is provided with an annular groove in which is seated a Neoprene O-ring 30. It can be seen that when the leaf member is mounted upon the hub, the hub grooves 25 communicate with both faces 12 and 13 of the leaf member.
Proceeding next to FIGS. 8-10, there is indicated generally at 31, a rectangular filter leaf assembly which is particularly adapted for a vertical filter device. The construction of the filter leaf assembly 31 is substantially the same as that of the assembly 10 described above. However, instead of having an opening in the center of the leaf member, a hose or conduit connection 32 is attached to an edge of the leaf member. The connection comprises a substantially channel-shaped member 33 provided with a longitudinal groove 34 which communicates with both faces of the leaf member as may be seen in FIG. 10. The element 33 is secured to the leaf member by a plurality of rivets or bolts 35. A hose or conduit connection 36 having a bore 37 is then secured to the element 33 to communicate with a bore 38 therein.
The regularly spaced cylindrical projections similarly function to provide a uniform supporting surface for the filter media positioned on both faces of the leaf member. The leaf member is also formed of a synthetic plastic material such as polypropylene and the cylindrical projections are integral therewith.
What is claimed is:
l. A filter leaf assembly comprising a relatively thin circular leaf member of a plastic material having sufficient thickness to be structurally self-supporting and having opposed faces, a plurality of cylindrical projections relatively closely spaced in a regular pattern on each face, said projections being of a uniform height and integral with the respective faces, a peripheral rib on each face of said leaf member being of a height equal to said projections, a circumferential groove in the outer peripheral edge of said leaf member, caulking means in said circumferential groove, and filter media on each of said leaf faces and positioned on the ends of said projections and said ribs by said caulking means and by a generally U-shaped molded binding composed of two halves clamped around the peripheral edges of said filter media relative to said leaf assembly, said leaf member having a central opening with a hub positioned therein, said hub having an external flange on one end of said hub, and means for retaining said leaf member on said hub against said flange, annular grooves in the outer peripheral surface of said hub communicating with said spaced projections on both faces of said leaf members, and
passage means in said hub extending from said annular grooves to the interior of said hub.
2. A filter leaf assembly as claimed in claim 1 with said leaf member being rectangular and wherein said opening is in one edge thereof, and hose connection means attached to said edge to communicate with the cylindrical projections on both faces of the leaf member.
3. A filter leaf assembly as claimed in claim 1 wherein the leaf member is of foamed plastic.

Claims (2)

  1. 2. A filter leaf assembly as claimed in claim 1 with said leaf member being rectangular and wherein said opening is in one edge thereof, and hose connection means attached to said edge to communicate with the cylindrical projections on both faces of the leaf member.
  2. 3. A filter leaf assembly as claimed in claim 1 wherein the leaf member is of foamed plastic.
US844574A 1969-07-24 1969-07-24 Plastic filter leaf with separator channels Expired - Lifetime US3648844A (en)

Applications Claiming Priority (1)

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US84457469A 1969-07-24 1969-07-24

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US3648844A true US3648844A (en) 1972-03-14

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US844574A Expired - Lifetime US3648844A (en) 1969-07-24 1969-07-24 Plastic filter leaf with separator channels

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US (1) US3648844A (en)
BE (1) BE753928A (en)
DE (1) DE2037897A1 (en)
FR (1) FR2055513A5 (en)
GB (1) GB1317789A (en)
NL (1) NL7010861A (en)
SE (1) SE372889B (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884805A (en) * 1974-05-13 1975-05-20 Artisan Ind Apparatus and process for continuous concentration of solids from a solids-containing fluid
US3884813A (en) * 1974-05-13 1975-05-20 Artisan Ind Solids concentrator with a rotor having ploughs thereon
DE2633752A1 (en) * 1975-07-25 1977-02-10 Burcan Int Ltd EARTH DRAINAGE DEVICE
US4066546A (en) * 1974-10-25 1978-01-03 Toshin Science Co., Ltd. Continuous filtering process and an apparatus therefor
US4902420A (en) * 1987-03-27 1990-02-20 Pall Corporation Segmented filter disc with slotted support and drainage plate and support spacer
US5100551A (en) * 1987-03-27 1992-03-31 Pall Corporation Segmented filter disc with slotted support and drainage plate
US5628916A (en) * 1994-08-17 1997-05-13 Pall Corporation Method for filtering edible oils
US5679249A (en) * 1991-12-24 1997-10-21 Pall Corporation Dynamic filter system
US5690836A (en) * 1992-07-31 1997-11-25 Pall Corporation Method of removing catalyst
US6117322A (en) * 1993-06-23 2000-09-12 Pall Corporation Dynamic filter system
US20110259812A1 (en) * 2008-11-04 2011-10-27 3M Innovative Properties Company Filter element and seal therefor
US20110309010A1 (en) * 2010-06-17 2011-12-22 Chi-Chang Kuo Filtering Unit
US20140299536A1 (en) * 2011-12-08 2014-10-09 3M Innovative Property Company Decreased adhesion pressure vessel for bag-type filtration systems
EP2990088A4 (en) * 2013-04-26 2016-12-21 Nagase Filter Co Ltd Retainer for filter, and filter using same
US20220347603A1 (en) * 2021-04-30 2022-11-03 Pall Corporation Filter disk segments

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139472A (en) * 1977-06-20 1979-02-13 Simonson Gordon L Filter sector
US4783258A (en) * 1986-06-05 1988-11-08 Willinger Bros. Filter cartridge with reuseable framework

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2395225A (en) * 1942-07-09 1946-02-19 Eimco Corp Filter construction
US2444147A (en) * 1945-03-15 1948-06-29 Air Maze Corp Liquid filter element
US3262577A (en) * 1964-05-14 1966-07-26 Komline Sanderson Eng Corp Leaf filter media clamping means
US3471022A (en) * 1967-07-19 1969-10-07 Robert Conrad Swimming pool filter
US3486627A (en) * 1967-02-21 1969-12-30 Carborundum Co Filter leaves
US3501010A (en) * 1967-01-12 1970-03-17 Eastman Kodak Co Dialyzing apparatus and method of making the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2395225A (en) * 1942-07-09 1946-02-19 Eimco Corp Filter construction
US2444147A (en) * 1945-03-15 1948-06-29 Air Maze Corp Liquid filter element
US3262577A (en) * 1964-05-14 1966-07-26 Komline Sanderson Eng Corp Leaf filter media clamping means
US3501010A (en) * 1967-01-12 1970-03-17 Eastman Kodak Co Dialyzing apparatus and method of making the same
US3486627A (en) * 1967-02-21 1969-12-30 Carborundum Co Filter leaves
US3471022A (en) * 1967-07-19 1969-10-07 Robert Conrad Swimming pool filter

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884805A (en) * 1974-05-13 1975-05-20 Artisan Ind Apparatus and process for continuous concentration of solids from a solids-containing fluid
US3884813A (en) * 1974-05-13 1975-05-20 Artisan Ind Solids concentrator with a rotor having ploughs thereon
US4066546A (en) * 1974-10-25 1978-01-03 Toshin Science Co., Ltd. Continuous filtering process and an apparatus therefor
DE2633752A1 (en) * 1975-07-25 1977-02-10 Burcan Int Ltd EARTH DRAINAGE DEVICE
US4057500A (en) * 1975-07-25 1977-11-08 Burcan International Limited Earth drain
US4902420A (en) * 1987-03-27 1990-02-20 Pall Corporation Segmented filter disc with slotted support and drainage plate and support spacer
US5100551A (en) * 1987-03-27 1992-03-31 Pall Corporation Segmented filter disc with slotted support and drainage plate
US5679249A (en) * 1991-12-24 1997-10-21 Pall Corporation Dynamic filter system
US6106713A (en) * 1991-12-24 2000-08-22 Pall Corporation Dynamic filter system
US5690836A (en) * 1992-07-31 1997-11-25 Pall Corporation Method of removing catalyst
US6117322A (en) * 1993-06-23 2000-09-12 Pall Corporation Dynamic filter system
US5628916A (en) * 1994-08-17 1997-05-13 Pall Corporation Method for filtering edible oils
US20110259812A1 (en) * 2008-11-04 2011-10-27 3M Innovative Properties Company Filter element and seal therefor
US10918985B2 (en) * 2008-11-04 2021-02-16 3M Innovative Properties Company Filter element and seal therefor
US20110309010A1 (en) * 2010-06-17 2011-12-22 Chi-Chang Kuo Filtering Unit
US8366931B2 (en) * 2010-06-17 2013-02-05 New Century Membrane Technology Co., Ltd. Filtering unit
US20140299536A1 (en) * 2011-12-08 2014-10-09 3M Innovative Property Company Decreased adhesion pressure vessel for bag-type filtration systems
EP2990088A4 (en) * 2013-04-26 2016-12-21 Nagase Filter Co Ltd Retainer for filter, and filter using same
US20220347603A1 (en) * 2021-04-30 2022-11-03 Pall Corporation Filter disk segments

Also Published As

Publication number Publication date
SE372889B (en) 1975-01-20
NL7010861A (en) 1971-01-26
GB1317789A (en) 1973-05-23
FR2055513A5 (en) 1971-05-07
BE753928A (en) 1970-12-31
DE2037897A1 (en) 1971-02-18

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Owner name: KETEMA, INC., 2233 STATE RD., BENSALEM, PA 19020,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMETEK, INC.;REEL/FRAME:004996/0839

Effective date: 19881130