Patent EP0544996A2 successfully refreshed from Google Patents.
Patent US4620211A successfully refreshed from Google Patents.
US4956089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forming an end-cap on a filter cartridge
Assignee: Individual
•
Filing: 1987-04-21
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Granted: 1990-09-11
•
Expires: 2007-04-21
Abstract
Abstract An end-cap for a filter cartridge is formed by melting the thermoplastic material of a supporting cage and of a support pleated together with the filter medium against a heated die and embedding the end of the filter medium in the material while it is molten. Extra thermoplastic material may be melted in the die. If all of the components of the cartridge are thermolplastic, then they all fuse together and contribute to the end-cap.
Inventors
- 👤 Stephen Hurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:17
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/06; B01D63/061; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D46/00; B01D46/0001; B01D46/24; B01D46/2403; B01D46/2411; B01D46/2414; B01D46/52; B01D46/521; B01D46/56; B01D46/62; Y; Y10; Y10S; Y10S264/00; Y10S264/48; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1038
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
116 words
A method of forming an end-cap on a filter cartridge comprising a filter medium and at least one supporting member of thermoplastic plastics material extending the length of said cartridge adjacent said medium, which method comprises bringing an end of said cartridge into engagement with a heated die at a temperature high enough to melt said material of said supporting member or members, and forming with said molten material an end-cap having an end portion of said filter medium sealingly embedded in or fused to it, wherein the length of said filter cartridge measured to an axially outer face of said end-cap is less than the overall length of said cartridge before formation of said end-cap.
Claim 2
Independent Claim
116 words
A method of forming an end-cap on a filter cartridge comprising a filter medium and at least one supporting member of thermoplastic plastics material extending the length of said cartridge adjacent said medium, which method comprises bringing an end of said cartridge into engagement with a heated die at a temperature high enough to melt said material of said supporting member or members, and forming with said molten material an end-cap having an end portion of said filter medium sealingly embedded in or fused to it, wherein the length of said filter cartridge measured to an axially outer face of said end-cap is less than the overall length of said cartridge before formation of said end-cap.
Claim 3
Dependent Claim
37 words
A method as claimed in claim 1, wherein said filter medium is in sheet form and is pleated to form a three-dimensional body the end faces of which are formed by a zigzagging edge of said medium.
Claim 4
Dependent Claim
52 words
A method as claimed in claim 2, wherein at least one said supporting member is a layer of material lying adjacent the surface of said filter medium within said body, and said filter medium and said at least one supporting member are substantially co-extensive and are pleated together to form said body.
Claim 5
Dependent Claim
31 words
A method as claimed in claim 2, wherein at least one said supporting member is a cage in the form of a perforate member lying adjacent a surface of said body.
Claim 6
Dependent Claim
15 words
A method as claimed in claim 1, wherein the filter medium comprises a microporous membrane.
Claim 7
Dependent Claim
46 words
A method as claimed in claim 5, wherein said filter medium comprises a microporous membrane of cellulose tri-acetate in a porous hydrophilic state, said cellulose tri-acetate being at least partially collapsed into a hydrophobic state by the heat where it is immersed in the molten material.
Claim 8
Dependent Claim
25 words
A method as claimed in claim 1, wherein said end of said cartridge is brought into engagement with an upwardly facing surface of said die.
Claim 9
Dependent Claim
25 words
A method as claimed in claim 1, wherein said die is provided with a rim defining a surface engaged by said end of said cartridge.
Claim 10
Dependent Claim
28 words
A method as claimed in claim 1, wherein said die is so shaped as to mould one or more protrusions and/or recesses on the outside of said end-cap.
Claim 11
Independent Claim
93 words
A method of forming an end-cap on a filter cartridge comprising a filter medium and at least one supporting member of thermoplastic plastics material extending the length of said cartridge adjacent said medium, which method comprises bringing an end of said cartridge into engagement with a heated die at a temperature high enough to melt said material of said supporting member or members, and forming an end-cap entirely from said molten material of said supporting member or members having an end portion of said filter medium sealingly embedded in or fused to it.
Claim 12
Independent Claim
93 words
A method of forming an end-cap on a filter cartridge comprising a filter medium and at least one supporting member of thermoplastic plastics material extending the length of said cartridge adjacent said medium, which method comprises bringing an end of said cartridge into engagement with a heated die at a temperature high enough to melt said material of said supporting member or members, and forming an end-cap entirely from said molten material of said supporting member or members having an end portion of said filter medium sealingly embedded in or fused to it.
Claim 13
Dependent Claim
53 words
A method as claimed in claim 10, wherein the filter medium is in sheet form and is pleated to form an annulus of a cylinder, wherein pleats extend axially, forming generally radial portions spaced apart circumferentially, and the end faces of said cylinder annulus are formed by a zigzagging edge of said medium.
Claim 14
Dependent Claim
54 words
A method as claimed in claim 11, wherein at least one said supporting member is a layer of material lying adjacent the surface of said filter medium within said cylinder annulus and said filter medium and said at least one supporting member are substantially co-extensive and are pleated together to form said cylinder annulus.
Claim 15
Dependent Claim
40 words
A method as claimed in claim 12, wherein at least one said supporting member is a cage in the form of a perforate cylindrical tube lying adjacent a respective one of the inner and outer surfaces of said cylinder annulus.
Claim 16
Independent Claim
114 words
A method of forming an end-cap on a filter cartridge comprising a filter medium and at least one supporting member of thermoplastic plastics material extending the length of said cartridge adjacent said medium, which method comprises bringing an end of said cartridge into engagement with a heated die at a temperature high enough to melt said thermoplastic material of said supporting member or members, melting an end portion of said supporting member or members, and forming with the molten material of said supporting member or members an end-cap having an end portion of said filter medium sealingly embedded in or fused to it, said end-cap being substantially integral with said supporting member or members.
Claim 17
Independent Claim
114 words
A method of forming an end-cap on a filter cartridge comprising a filter medium and at least one supporting member of thermoplastic plastics material extending the length of said cartridge adjacent said medium, which method comprises bringing an end of said cartridge into engagement with a heated die at a temperature high enough to melt said thermoplastic material of said supporting member or members, melting an end portion of said supporting member or members, and forming with the molten material of said supporting member or members an end-cap having an end portion of said filter medium sealingly embedded in or fused to it, said end-cap being substantially integral with said supporting member or members.
Claim 18
Dependent Claim
37 words
A method as claimed in claim 14, wherein said filter medium is in sheet form and is arranged to form a three-dimensional body the end faces of which are formed by a zigzagging edge of said medium.
Claim 19
Dependent Claim
29 words
A method as claimed in claim 15, wherein said body is a symmetrical annulus of a right-circular cylinder, wherein pleats extend axially, forming generally radial portions spaced apart circumferentially.
Claim 20
Dependent Claim
37 words
A method as claimed in claim 16, wherein at least one said supporting member is a cage in the form of a perforate cylindrical tube lying adjacent one of the inner and outer surfaces of said body.
Claim 21
Dependent Claim
52 words
A method as claimed in claim 15, wherein at least one said supporting member is a layer of material lying adjacent the surface of said filter medium within said body, and said filter medium and said at least one supporting member are substantially co-extensive and are pleated together to form said body.
Claim 22
Dependent Claim
71 words
A method as claimed in claim 14, wherein a piece of thermoplastic material which may be of the same material as at least one said supporting member and/or of a different material from at least one said supporting member is melted in said die before or at the same time as the filter cartridge is brought into engagement therewith so as to form part of said molten material forming said end-cap.
Claim 23
Dependent Claim
15 words
A method as claimed in claim 14, wherein said filter medium comprises a microporous membrane.
Claim 24
Dependent Claim
18 words
A method as claimed in claim 14, wherein said filter medium comprises a layer of a cellulose material.
Claim 25
Dependent Claim
37 words
A method as claimed in claim 14, wherein the length of said filter cartridge measured to an axially outer face of said end-cap is less than the overall length of said cartridge before formation of said end-cap.
Claim 26
Dependent Claim
71 words
A filter cartridge comprising a filter medium, at least one supporting member of thermoplastic plastics material extending the length of said filter cartridge adjacent said medium, and at least one end-cap of thermoplastic plastics material integral with said supporting member or members and consisting at least partially of the material of said supporting member or members, in which end-cap an end portion of said filter medium is sealingly fused and/or embedded.
Claim 27
Dependent Claim
71 words
A filter cartridge comprising a filter medium, at least one supporting member of thermoplastic plastics material extending the length of said filter cartridge adjacent said medium, and at least one end-cap of thermoplastic plastics material integral with said supporting member or members and consisting at least partially of the material of said supporting member or members, in which end-cap an end portion of said filter medium is sealingly fused and/or embedded.
Claim 28
Dependent Claim
39 words
A filter cartridge as claimed in claim 23, wherein said filter medium is in sheet form and is pleated to form a three-dimensional body said end portion of which is formed by a zigzagging edge portion of said medium.
Claim 29
Dependent Claim
29 words
A filter cartridge as claimed in claim 24, wherein said body is an annulus of a cylinder and said pleats extend axially, forming generally radial portions spaced apart circumferentially.
Claim 30
Dependent Claim
53 words
A filter cartridge as claimed in claim 25, wherein at least one said supporting member is a layer of material lying adjacent the surface of said filter medium within said body, and said filter medium and said at least one supporting member are substantially co-extensive and are pleated together to form said body.
Claim 31
Dependent Claim
33 words
A filter cartridge cartridge as claimed in claim 26, which comprises two said supporting members in the form of cylindrical cages lying adjacent to the inner and outer surfaces respectively, of said body.
Claim 32
Dependent Claim
33 words
A filter cartridge as claimed in claim 24, wherein at least one said supporting member is a cage in the form of a perforate member lying adjacent a surface of the said body.
Claim 33
Dependent Claim
16 words
A filter cartridge as claimed in claim 23, wherein said filter medium comprises a microporous membrane.
Claim 34
Dependent Claim
43 words
A filter cartridge as claimed in claim 29, wherein said filter medium comprises a microporous membrane of cellulose tri-acetate in a porous hydrophilic form, said cellulose tri-acetate being at least partly collapsed into a hydrophobic form where it is embedded in said end-cap.
Claim 35
Dependent Claim
28 words
A filter cartridge as claimed in claim 23, having at least one protrusion and/or at least one recess moulded on the outside of at least one said end-cap.
Claim 36
Dependent Claim
31 words
A filter cartridge as claimed in claim 23, wherein said end-cap comprises material different from that of at least one said supporting member fused with said material of said supporting member.
Claim 37
Dependent Claim
16 words
A filter cartridge as claimed in claim 23, wherein said filter medium comprises a cellulose material.
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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) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |