Patent US5728299A successfully refreshed from Google Patents.
US5728299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound non-woven fabric filter having heat fusible fibers
Assignee: JNC Corp
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Filing: 1996-10-04
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Granted: 1998-03-17
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Expires: 2016-10-04
Abstract
Abstract The cartridge filter of the present invention is a filter comprising a wound and laminated composite non-woven fabric containing heat fusible fibers, wherein the delamination strength between layers of the laminated composite non-woven fabric of said filter increases continuously or discontinuously from the outer layer toward the inner layer, the delamination strength of the inner layer-exceeds 1000 gf/5 cm, and the delamination strength of the outer layer is 5 to 1000 gf/5 cm. This cartridge excels in filtering life, filtering accuracy, and pressure resistance.
Inventors
- 👤 Shinichi Tokudome
- 👤 Satoshi Ogata
- 👤 Katsuhiro Shishikura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:39
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; B01D2239/00; B01D2239/06; B01D2239/0604; B01D2239/0622; B01D2239/0627; B01D2239/065; B01D2239/0668; B01D2239/069; B01D2239/0695; B01D2239/12; B01D2239/1291; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/1369; Y10T428/249921; Y10T428/249924; Y10T428/249933; Y10T428/249938
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
73 words
A filter having an outer and an inner layer comprising a wound and laminated composite non-woven fabric containing heat fusible fibers, wherein the delamination strength between layers of the laminated composite non-woven fabric of said filter increases continuously or discontinuously from the outer layer toward the inner layer, the delamination strength of the inner layer exceeds 1000 gf/5 cm, and the delamination strength of the outer layer is 5 to 1000 gf/5 cm.
Claim 2
Dependent Claim
73 words
A filter having an outer and an inner layer comprising a wound and laminated composite non-woven fabric containing heat fusible fibers, wherein the delamination strength between layers of the laminated composite non-woven fabric of said filter increases continuously or discontinuously from the outer layer toward the inner layer, the delamination strength of the inner layer exceeds 1000 gf/5 cm, and the delamination strength of the outer layer is 5 to 1000 gf/5 cm.
Claim 3
Dependent Claim
62 words
A filter according to claim 1, wherein the outer layer comprises a surface layer having a delamination strength of 5 to 500 gf/5 cm and made of the laminated composite non-woven fabric, and further comprises an intermediate layer located under said surface layer and having a delamination strength of 500 to 1000 gf/5 cm and made of the laminated composite non-woven fabric.
Claim 4
Dependent Claim
46 words
A filter according to claim 1, wherein the delamination strength of the surface layer region is 5 to 500 gf/5 cm, and the delamination strength of the inner layer exceeds 1000 gf/5 cm, and the delamination strength varies continuously within the region between these two regions.
Claim 5
Dependent Claim
43 words
A filter according to claim 1, wherein the composite non-woven fabric is a composite short-fiber non-woven fabric consisting of a high melting point component and a low melting point component, the difference between melting points of these components being at least 10° C.
Claim 6
Dependent Claim
44 words
A filter according to claim 1, wherein the composite non-woven fabric is a composite long fiber non-woven fabric consisting of a high melting point component and a low melting point component, the difference between melting points of these components being at least 10° C.
Claim 7
Dependent Claim
42 words
A filter according to claim 1, wherein the composite non-woven fabric is a melt-blown non-woven fabric consisting of a high melting point component and a low melting point component, the difference between melting points of these components being at least 10° C.
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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) | 2001-03-16 | 2001-09-15 | 2002-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-16 | 2005-09-15 | 2006-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-16 | 2009-09-15 | 2010-03-17 | $7700.00 | Window Closed / Lapsed |