Patent US4861633A successfully refreshed from Google Patents.
US4861633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylindrical filter
Assignee: JNC Corp
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Filing: 1988-05-19
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Granted: 1989-08-29
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Expires: 2008-05-19
Abstract
Abstract A superior cylindrical filter having a long filtration life is provided, which filter is obtained by using interlaced filaments comprising 20% by weight or more of hot-melt-adhesive composite filaments composed of plurality of components having a melting point difference of 20° C. or more and having two or more interlaced portions per meter of which the interlacing strength is 15×D mg or more, wound up on a core material in a cylindrical form under a tension of 15×D mg or less, the contact points of the interlaced filaments being bonded by melt-adhesion of the low melting component of the composite filaments.
Inventors
- 👤 Morio Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:42
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; Y; Y10; Y10S; Y10S57/00; Y10S57/905; Y10S57/908; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1369; Y10T428/249921; Y10T428/249922; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/627; Y10T442/632; Y10T442/637
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A cylindrical filter composed of interlaced filaments comprising 20% by weight or more of hot-melt adhesive composite filaments composed of a plurality of components having a melting point difference of 20° C. or more therebetween and having two or more interlaced portions per meter of said interlaced filaments of which portions the interlacing strength is 15×D mg or more, wound up on a central core material in cylindrical form under a tension of 15×D mg or less, where D equals the total denier of said interlaced filaments, the contact points of said interlaced filaments being bonded by melt-adhesion of the low melting component of said composite filaments to integrate said interlaced filaments.
Claim 2
Dependent Claim
112 words
A cylindrical filter composed of interlaced filaments comprising 20% by weight or more of hot-melt adhesive composite filaments composed of a plurality of components having a melting point difference of 20° C. or more therebetween and having two or more interlaced portions per meter of said interlaced filaments of which portions the interlacing strength is 15×D mg or more, wound up on a central core material in cylindrical form under a tension of 15×D mg or less, where D equals the total denier of said interlaced filaments, the contact points of said interlaced filaments being bonded by melt-adhesion of the low melting component of said composite filaments to integrate said interlaced filaments.
Claim 3
Dependent Claim
21 words
A cylindrical filter according to claim 1 wherein said interlaced filaments are used only on the outer layer of said filter.
Claim 4
Dependent Claim
18 words
A cylindrical filter according to claim 1 wherein said hot-melt-adhesive composite filaments are two- or three-dimensional crimped filaments.
Claim 5
Dependent Claim
22 words
A cylindrical filter according to claim 1 wherein said interlaced filaments comprise 30 to 100% by weight of hot-melt adhesive composite filaments.
Claim 6
Dependent Claim
19 words
A cylindrical filter according to claim 1 wherein the strength of the interlaced filaments is 20D (mg) or higher.
Claim 7
Dependent Claim
21 words
A cylindrical filter according to claim 1 wherein said hot-melt adhesive composite filament is composed of sheath-and-core, side-by-side or island-in-sea components.
Claim 8
Dependent Claim
49 words
A cylindrical filter according to claim 6 wherein said components consist of a high melting point component which is selected form polyester, polyamide, polypropylene and polyvinylchloride and a low melting point component which is selected from low melting polyester, low melting polyamide, low melting polypropylene, polyethylene and ethylene-vinylacetate copolymer.
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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |