Patent US4842739A successfully refreshed from Google Patents.
US4842739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High surface area filter cartridge
Assignee: 3M Co
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Filing: 1987-08-20
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Granted: 1989-06-27
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Expires: 2007-08-20
Abstract
Abstract New, high surface area per unit volume, generally cylindrical filter cartridge for gaseous or liquid filter applications are described. These filter cartridges which comprise a nested arrangement of substantially disk shaped layers having a radial pleat pattern embossed therein, are capable of achieving higher surface areas per unit volume than can be achieved with conventionally pleated filter cartridges. Utilization of the filter media is extremely high as blocking of adjacent layers of filter media is avoided and fluids are evenly distributed over the total area of the filter media as a result of the series of channels created by the nesting of the disk shaped pleated layers.
Inventors
- 👤 Yuan-Ming Tang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:30
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; B01D29/46; B01D29/11; B01D29/31; B01D29/35; B01D29/353; B01D29/01; B01D29/05; B01D29/07; B01D29/13; B01D29/15; B01D29/21; B01D29/23; B01D29/232; B01D29/33; B01D29/333; B01D2201/00; B01D2201/18; B01D2201/182
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
73 words
A generally tubular filter cartridge for separating constituent components of a fluid mixture, said cartridge comprising a sheet that includes at least one layer of filter media arrayed in a nested arrangement of substantially disk-shaped filter members, each filter member comprising first and second annular sections of said sheet connected together at their outer circumference and having a pattern of radial pleats thereon which nest with the radial pleats on an adjoining section.
Claim 2
Dependent Claim
73 words
A generally tubular filter cartridge for separating constituent components of a fluid mixture, said cartridge comprising a sheet that includes at least one layer of filter media arrayed in a nested arrangement of substantially disk-shaped filter members, each filter member comprising first and second annular sections of said sheet connected together at their outer circumference and having a pattern of radial pleats thereon which nest with the radial pleats on an adjoining section.
Claim 3
Dependent Claim
16 words
A filter cartridge according to claim 1 wherein said filter media comprises a plurality of layers.
Claim 4
Dependent Claim
21 words
A filter cartridge according to claim 2 wherein each layer of said plurality of adjacent filter media has the same porosity.
Claim 5
Dependent Claim
21 words
A filter cartridge according to claim 2 wherein each layer of said plurality of adjacent filter media has a different porosity.
Claim 6
Dependent Claim
25 words
A filter cartridge according to claim 4 wherein each layer of said plurality of filter media has a finer porosity than its adjacent upstream layer.
Claim 7
Dependent Claim
20 words
A filter cartridge according to claim 1 wherein the filter media element comprises a longitudinally collapsed, peripherally integral, continuous tube.
Claim 8
Dependent Claim
35 words
A filter cartridge according to claim 6 wherein said continuous tubular filter media element is formed from a substantially flat filter media material which has been seamed together by means of a fluid impervious seal.
Claim 9
Dependent Claim
31 words
A filter cartridge according to claim 7 wherein said substantially flat filter media element is embossed with a pattern of a multiplicity of transverse rows of alternating raised and recessed shapes.
Claim 10
Dependent Claim
34 words
A filter cartridge according to claim 8 wherein said embossed pattern defines a series of transverse and longitudinal forming lines for said disk shaped filter layers and said radial pleat pattern on said layers.
Claim 11
Dependent Claim
30 words
A filter cartridge according to claim 9 wherein the height of said embossed shapes is less than about 50% of the radius of the collapsed cylindrically shaped filter media element.
Claim 12
Dependent Claim
30 words
A filter cartridge according to claim 9 wherein said disk shaped layers are generated from an alternating inward/outward folding action on transverse forming lines of said tubular filter media element.
Claim 13
Dependent Claim
35 words
A filter cartridge according to claim 11 wherein the radial pleat pattern of adjacent disk layers nest together so as to form passages through which fluids are uniformly distributed over the total filter media element.
Claim 14
Dependent Claim
47 words
A filter cartridge according to claim 1 wherein said filter media element is attached to at least one endpiece by means of a fluid impervious seal, said endpiece providing a means for introducing or removing fluid components to or from the inner portion of said filter cartridge.
Claim 15
Dependent Claim
16 words
A filter cartridge according to claim 13 wherein said filter cartridge includes a supplemental support structure.
Claim 16
Dependent Claim
17 words
A filter cartridge according to claim 14 wherein said support structure comprises an inner porous tube-like member.
Claim 17
Dependent Claim
17 words
A filter cartridge according to claim 14 wherein said support structure comprises an outer porous tube-like member.
Claim 18
Dependent Claim
17 words
A filter cartridge according to claim 14 wherein said filter cartridge includes inner and outer support members.
Claim 19
Dependent Claim
52 words
A filter cartridge according to claim 1 wherein said filter media element is sealed on itself on one end and attached to an endpiece on the opposite end by means of a fluid impervious seal, said endpiece having a means of introducing or removing fluids to the inner portion of said filter.
Claim 20
Dependent Claim
97 words
A generally tubular filter cartridge for separating constituent components of a fluid mixture, said cartridge comprising a porous tubular sheet that includes at least one filter medium layer longitudinally collapsed to form disk-shaped filter members that each comprise connected first and second annular sections of said sheet, said sections having a pattern of radial pleats thereon which nest with the radial pleats of adjoining sections, the annular sections leaving a central cylindrical opening disposed along the longitudinal axis of the cartridge, whereby fluid to be filtered passes through the sheet into or from the central cylindrical opening.
Claim 21
Dependent Claim
97 words
A generally tubular filter cartridge for separating constituent components of a fluid mixture, said cartridge comprising a porous tubular sheet that includes at least one filter medium layer longitudinally collapsed to form disk-shaped filter members that each comprise connected first and second annular sections of said sheet, said sections having a pattern of radial pleats thereon which nest with the radial pleats of adjoining sections, the annular sections leaving a central cylindrical opening disposed along the longitudinal axis of the cartridge, whereby fluid to be filtered passes through the sheet into or from the central cylindrical opening.
Claim 22
Dependent Claim
25 words
A cartridge of claim 19 in which a coarse scrim is disposed in laminar relationship on at least one side of the filter medium layer.
Claim 23
Dependent Claim
52 words
A cartridge of claim 19 in which the radial pleats comprise cylindrical recesses and raised areas in the filter sheet, with the cylindrical recesses and raised areas of one layer mating with the recesses and raised areas of adjacent layers so that the cylindrical recesses and raised areas nest within one another.
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |