US3716970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter device and method for the manufacture thereof
Assignee: Luwa Ltd
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Filing: 1970-08-13
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Granted: 1973-02-20
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Expires: 1990-08-13
Abstract
Abstract A filter device comprising zig-zag folded substantially flat filter material is disclosed. The invention contemplates the provision of at least one, but preferably a plurality of substantially parallel tubular-shaped elements defining bead means or elevated portions secured to a least one side of the filter material. The tubular-shaped elements extend substantially perpendicular to the folds of the filter material and serve to support such folds in spaced relationship from one another. The invention further contemplates an improved method for the manufacture of such filter device wherein prior to the formation of the folds at the flat filter material there is first formed at least one tubular-shaped element at the filter material, then an adhesive material is applied to the tubular-shaped element, preferably by introduction thereof internally of such tubularshaped element so that the adhesive material penetrates through the tubular-shaped element and fixedly adheres such tubularshaped element to the neighboring portions of the filter material.
Inventors
- 👤 E Stupf
- 👤 T Haan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:47
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D46/0001; B01D46/10; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/2419
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
104 words
A filter device comprising zig-zag folded substantially flat filter material having a plurality of folds, at least one substantially tubular-shaped element defining bead means secured to at least one side of said filter materIal, said tubular-shaped element extending substantially perpendicular to said folds and having corresponding alternate internal and external bends at the folds and serving to mutually support said folds in spaced relationship from one another, said tubular shaped element being selectively at least partially collapsed by inward movement of the spaced walls at the bends to allow formation of the desired tightness of folds without damaging the filter material at the bends.
Claim 2
Dependent Claim
104 words
A filter device comprising zig-zag folded substantially flat filter material having a plurality of folds, at least one substantially tubular-shaped element defining bead means secured to at least one side of said filter materIal, said tubular-shaped element extending substantially perpendicular to said folds and having corresponding alternate internal and external bends at the folds and serving to mutually support said folds in spaced relationship from one another, said tubular shaped element being selectively at least partially collapsed by inward movement of the spaced walls at the bends to allow formation of the desired tightness of folds without damaging the filter material at the bends.
Claim 3
Dependent Claim
26 words
A filter device as defined in claim 1, wherein there is provided a plurality of said tubular-shaped elements which extend in substantial parallelism to one another.
Claim 4
Dependent Claim
18 words
A filter device as defined in claim 1, wherein said tubular-shaped element is formed of a deformable plastic.
Claim 5
Dependent Claim
17 words
A filter device as defined in claim 1, wherein said tubular-shaped element is formed of textile fibers.
Claim 6
Dependent Claim
17 words
A filter device as defined in claim 1, wherein said tubular-shaped element is formed of porous material.
Claim 7
Dependent Claim
19 words
A filter device as defined in claim 1, wherein said tubular-shaped element is coated with a solidifiable adhesive material.
Claim 8
Dependent Claim
41 words
A filter device as defined in claim 1, wherein said tubular-shaped element is porous and internally injected with a flowable solidifiable adhesive material, said adhesive material extending from the inside to the outside for securing said element to the filter material.
Claim 9
Dependent Claim
139 words
In a method of manufacturing a substantially zig-zag folded filter device for fluid mediums, comprising the steps of: forming at least one band-like member into a substantially tubular-shaped element prior to attachment thereof with a substantially flat filter material, applying a flowable adhesive material into the interior of said tubular-shaped porous element to permit the adhesive material to penetrate through the tubular-shaped element, bringing together said tubular-shaped element and at least one surface of the filter material to effect a bond through said adhesive material and folding said filter material and said tubular-shaped element to form folds perpendicular to said tubular shaped element, said folding including at least partially collapsing by inward movement the spaced walls of said element at the bends to allow formation of the desired tightness of folds without damaging the filter material at the bends.
Claim 10
Dependent Claim
139 words
In a method of manufacturing a substantially zig-zag folded filter device for fluid mediums, comprising the steps of: forming at least one band-like member into a substantially tubular-shaped element prior to attachment thereof with a substantially flat filter material, applying a flowable adhesive material into the interior of said tubular-shaped porous element to permit the adhesive material to penetrate through the tubular-shaped element, bringing together said tubular-shaped element and at least one surface of the filter material to effect a bond through said adhesive material and folding said filter material and said tubular-shaped element to form folds perpendicular to said tubular shaped element, said folding including at least partially collapsing by inward movement the spaced walls of said element at the bends to allow formation of the desired tightness of folds without damaging the filter material at the bends.
Claim 11
Dependent Claim
48 words
The method as defined in claim 8, further including the step of folding the flat filter material together with the thus bonded tubular-shaped element into a substantially zig-zag configuration with sufficiently tight folds to bring the internal spaced walls of said tubular-shaped element into contact at said bends.
Claim 12
Dependent Claim
28 words
The method as defined in claim 8, wherein the band-like member is formed into said substantially tubular-shaped element directly prior to attachment thereof with said flat filter material.
Claim 13
Dependent Claim
32 words
The method as defined in claim 10, wherein the step of forming the band-like member into a substantially tubular-shaped element is undertaken by rolling together said band-like member about its lengthwise axis.
Claim 14
Dependent Claim
23 words
The method as defined in claim 11, wherein the step of rolling said band-like member brings the lengthwise edges thereof into abutting relationship.
Claim 15
Dependent Claim
24 words
The method as defined in claim 11, wherein the step of rolling together the band-like member brings the longitudinal edges thereof into overlapping relationship.
Claim 16
Dependent Claim
48 words
The method as defined in claim 8, further including the steps of forming a plurality of band-like members into substantially tubular-shaped elements which are then bonded by said adhesive material to at least one surface of the filter material in substantially parallel relationship with respect to one another.
Claim 17
Dependent Claim
125 words
In a method of manufacturing a substantially zig-zag folded filter device for fluid mediums, comprising the steps of forming at least one band-like member into a substantially tubular-shaped element prior to attachment thereof with a filter material defining a filter mat, applying flowable adhesive material to said substantially tubulAr-shaped element, bringing together said tubular-shaped element and at least one surface of the filter material to effect a bond through said adhesive material and folding said filter material and said tubular-shaped element to form folds perpendicular to said tubular-shaped element, said folding including at least partially collapsing by inward movement the spaced walls of said element at the bends to allow formation of the desired tightness of folds without damaging the filter material at the bends.
Claim 18
Dependent Claim
125 words
In a method of manufacturing a substantially zig-zag folded filter device for fluid mediums, comprising the steps of forming at least one band-like member into a substantially tubular-shaped element prior to attachment thereof with a filter material defining a filter mat, applying flowable adhesive material to said substantially tubulAr-shaped element, bringing together said tubular-shaped element and at least one surface of the filter material to effect a bond through said adhesive material and folding said filter material and said tubular-shaped element to form folds perpendicular to said tubular-shaped element, said folding including at least partially collapsing by inward movement the spaced walls of said element at the bends to allow formation of the desired tightness of folds without damaging the filter material at the bends.
Claim 19
Dependent Claim
26 words
A filter device as defined in claim 7, wherein the marginal edges of the tubular-shaped element are bonded to one another by said solidifiable adhesive material.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |