Patent US4844371A successfully refreshed from Google Patents.
Patent US3834547A successfully refreshed from Google Patents.
US3834547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous product
Assignee: Albany International Corp
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Filing: 1973-07-16
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Granted: 1974-09-10
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Expires: 1993-07-16
Abstract
Abstract An improved roving capable of being mechanically worked without first forming a yarn is disclosed. The improved roving is in the form of a strand of staple fibers prepared in accordance with customary textile carding process. The formed roving is treated with a resin binder and, when cured, the fibers resemble a reticulated network. The fibers are disoriented and cross over one another at a multiplicity of points to form bonding sites at the cross-over point when the resin is cured, while maintaining the fibers spacially separated between the bonding sites. The thus treated roving is found to have good flexibility and abrasion resistance while providing the roving with unexpected tensile strength, increased elasticity, permeability, void volume and porosity even when the roving is subjected to compressive forces as compared with untreated roving subjected to the same forces.
Inventors
- 👤 A Renjilian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:19
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D39/00; B01D39/08; B01D39/083; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; B01D2101/00; B01D2101/005; B01D2239/00; B01D2239/04; B01D2239/0464; B01D2239/06; B01D2239/065; B01D2239/069; B01D2239/0695; B01D2239/08; B01D2239/086; B01D2275/00; B01D2275/10; B01D2275/105
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
A filtration device adapted for use for filtering fluid media comprising a tubular core member having perforations therein; treated roving being wound about and covering the openings in said core member; said treated roving forming a plurality of layers around said core member; said treated roving comprising a strand of staple fibers in the form of a bundle of disoriented fibers which cross over one another at a multiplicity of points, said fibers carrying on their surfaces a resin adhesive binder, said fibers being bonded together by said resin binder at respective crossover points with the resin binder being cured to maintain said fibers in spatial separation between the crossover points thereby providing a roving which is permeable and substantially of the same density throughout.
Claim 2
Dependent Claim
125 words
A filtration device adapted for use for filtering fluid media comprising a tubular core member having perforations therein; treated roving being wound about and covering the openings in said core member; said treated roving forming a plurality of layers around said core member; said treated roving comprising a strand of staple fibers in the form of a bundle of disoriented fibers which cross over one another at a multiplicity of points, said fibers carrying on their surfaces a resin adhesive binder, said fibers being bonded together by said resin binder at respective crossover points with the resin binder being cured to maintain said fibers in spatial separation between the crossover points thereby providing a roving which is permeable and substantially of the same density throughout.
Claim 3
Dependent Claim
26 words
The filtration device of claim 1 wherein the treated roving is formed having a diameter substantially equal to or greater than the diameter of untreated roving.
Claim 4
Dependent Claim
29 words
The filtration device of claim 1 wherein the adhesive is carried on the fibers in amounts between about 1 percent and 100 percent by weight of the dried fibers.
Claim 5
Dependent Claim
29 words
The filtration device of claim 1 wherein the adhesive is carried on the fibers in amounts between about 2 percent and 25 percent by weight of the dried fibers.
Claim 6
Dependent Claim
37 words
The filtration device of claim 1 wherein the adhesive comprises at least one material selected from the group consisting of polyethylene, polypropylene, polyamide, polyester, epoxy resin, polyurethane, polyvinyl resin, acrylic resin, polyvinly alcohol and rubber based adhesives.
Claim 7
Dependent Claim
32 words
The filtration device of claim 1 wherein the roving has a break strength of at least about 0.5 pound and the adhesive has a tensile strength of at least about 1,500 psi.
References Cited (Backward Citations)
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |