EP0417364A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polyimide composite filter fabrics
Assignee: ALBARRIE (EUROPE) Ltd
•
Filing: 1989-10-13
•
Granted: —
•
Expires: 2009-10-13
Abstract
Abstract Composite filter cloths (10) having a top layer (12) of P84 polyimide fiber and a depth filtration type fabric substrate (20) may be structured to have a higher particulate removal efficiency than that for the substrate layer (20) and a lower pressure drop than that of the top layer (12).
Inventors
- 👤 Emerson Lee Noddin
- 👤 Mark Roger Aitken
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 11:49
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4326; D04H1/435; D04H1/4374; D04H1/44; D04H1/46; D04H1/498; D04H3/00; D04H3/02; D04H3/04; B01D2239/00; B01D2239/06; B01D2239/065; B01D2239/0654; B01D2239/0659; Y; Y10; Y10T; Y10T442/00; Y10T442/10; Y10T442/184; Y10T442/197; Y10T442/60; Y10T442/659; Y10T442/666; Y10T442/667
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
74 words
A composite filter fabric comprising: a first layer consisting of a plurality of staple fibers of P84 polyimide polymer consolidated through entanglement of said fibers, said entanglement being of the character produced by a needle punching operation; a substrate layer of a depth filtration filter fabric; fibers of said depth filtration filter fabric having a diameter not substantially less than that of said staple fibers; and means bonding said first layer to said substrate.
Claim 2
Dependent Claim
74 words
A composite filter fabric comprising: a first layer consisting of a plurality of staple fibers of P84 polyimide polymer consolidated through entanglement of said fibers, said entanglement being of the character produced by a needle punching operation; a substrate layer of a depth filtration filter fabric; fibers of said depth filtration filter fabric having a diameter not substantially less than that of said staple fibers; and means bonding said first layer to said substrate.
Claim 3
Dependent Claim
45 words
A composite filter fabric as defined in Claim 1, wherein said means bonding said layers together comprises an entanglement of the fibers of each said layer within the fibers of the other layer, said entanglement being of the character produced by a needle punching operation.
Claim 4
Dependent Claim
23 words
A composite filter fabric as defined in Claim 1, wherein said fibers of said substrate filter fabric are formed from an organic polymer.
Claim 5
Dependent Claim
31 words
A filter fabric as defined in Claim 3, wherein said organic polymer is selected from the group consisting of polyesters, polypropylene, polyethylene, nylons, aromatic polyamides, polyacrylates, polyphenylene sulfide, polytetrafluoroethylene and polybenzimidazole.
Claim 6
Dependent Claim
25 words
A filter fabric as defined in Claim 1, wherein said substrate layer is in the form of a non woven fabric commingled with a scrim.
Claim 7
Dependent Claim
15 words
A filter fabric as defined in Claim 5, wherein said substrate layer is a polyester.
Claim 8
Dependent Claim
27 words
A filter fabric as defined in Claim 1, wherein said first layer comprises not less than about 5% by weight of the weight of the filter fabric.
Claim 9
Dependent Claim
28 words
A filter fabric as defined in Claim 7, wherein said first layer comprises from about 25% to about 35% by weight of the weight of the filter fabric.
Claim 10
Dependent Claim
35 words
A filter fabric as defined in Claim 1, wherein said fibers of said substrate layer have a diameter of not less than about 1.5 times that of the diameter of fibers of said first layer.
Claim 11
Dependent Claim
36 words
A filter fabric as defined in Claim 1, wherein said fibers of said substrate layer have a diameter of about 1.5 to about 4 times that of the diameter of the fibers of said first layer.
Claim 12
Dependent Claim
34 words
A filter fabric as defined in Claim 1, wherein said fibers of said first layer have a diameter of about 2 denier and of said substrate layer have a diameter of about 6 denier.
Claim 13
Dependent Claim
48 words
A composite filter fabric comprising a first layer consisting of a non-woven P84 polyimide fiber fabric; a substrate layer comprising at least a depth filtration filter fabric, and means bonding said layers together; said substrate layer having a higher fluid flow rate than that of said first layer.
Claim 14
Dependent Claim
48 words
A composite filter fabric comprising a first layer consisting of a non-woven P84 polyimide fiber fabric; a substrate layer comprising at least a depth filtration filter fabric, and means bonding said layers together; said substrate layer having a higher fluid flow rate than that of said first layer.
Claim 15
Dependent Claim
26 words
A composite filter fabric as defined in Claim 12, wherein said depth filtration filter fabric is formed from unwoven polyester fibers consolidated together by needle punching.
Claim 16
Dependent Claim
32 words
A composite filter fabric as defined in Claim 13, wherein said diameter of said fibers forming said substrate layer is about 3 times the diameter of said fiber of said first layer.
Claim 17
Dependent Claim
34 words
A composite filter fabric as defined in Claim 13, wherein said means bonding said layers together comprise the entanglement of the fibers of said first layer with fibers of said substrate layer and vice-versa.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.