US5288402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid filter medium including a fibrillated filtering layer and an organic fiber support
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1992-10-26
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Granted: 1994-02-22
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Expires: 2012-10-26
Abstract
Abstract A two-layered filter medium for liquid filtration comprises a support composed of organic fibers of 7 μm or more in diameter and basis weight of 30-150 g/m 2 , and a filtering layer composed of three kinds of organic fibers different in diameter, a part or all of the kind of organic fibers having the largest diameter being a fibrous organic binder.
Inventors
- 👤 Mitsuo Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:26
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; Y; Y10; Y10S; Y10S55/00; Y10S55/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
A filter medium for liquid filtration which comprises: a filtering layer comprising 5-40% by weight of fibrillated organic fibers having a fiber diameter of 1 μm or less, 5-70% by weight of ultra-fine organic fibers having a fiber diameter of 1-5 μm, and 20-70% by weight of organic fibers having a fiber diameter of more than 5 μm, a part or all of the organic fibers having a fiber diameter of more than 5 μm being a fibrous organic binder, and having an average pore size of 1-10 μm and a basis weight of 5-50 g/m 2 , and a support comprising organic fibers having a fiber diameter of 7 μm or more and a basis weight of 30-150 g/m 2 , and the filtering layer and the support being integrated into a piece.
Claim 2
Dependent Claim
134 words
A filter medium for liquid filtration which comprises: a filtering layer comprising 5-40% by weight of fibrillated organic fibers having a fiber diameter of 1 μm or less, 5-70% by weight of ultra-fine organic fibers having a fiber diameter of 1-5 μm, and 20-70% by weight of organic fibers having a fiber diameter of more than 5 μm, a part or all of the organic fibers having a fiber diameter of more than 5 μm being a fibrous organic binder, and having an average pore size of 1-10 μm and a basis weight of 5-50 g/m 2 , and a support comprising organic fibers having a fiber diameter of 7 μm or more and a basis weight of 30-150 g/m 2 , and the filtering layer and the support being integrated into a piece.
Claim 3
Dependent Claim
37 words
The filter medium for liquid filtration according to claim 1 in which the organic fibers of the support comprises at least one member selected from the group consisting of polyolefin, polyamide, polyester, acrylic and vinylon synthetic fibers.
Claim 4
Dependent Claim
80 words
The filter medium for liquid filtration according to claim 1 in which the fibrillated organic fibers having a fiber diameter of 1 mm or less of the filter sheet comprises at least one member selected from the group consisting of fibrillated Kevlar fibers, polyester pulps prepared by an alkali-amount-reducing and beating method, fiber-like fibrils prepared by fibrid method, fibrils prepared by a split method, fiber-like fibrils prepared by a polymer-blend dissolving method, and fiber-like fibrils prepared by flush spinning method.
Claim 5
Dependent Claim
49 words
The filter medium for liquid filtration according to claim 1, 2 or 3 in which the organic fibers of the support contains at least one member selected from the group consisting of polyester, polyolefin, and vinyl chloride-vinyl acetate copolymer fibrous organic binders in an amount of 10-60% by weight.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1997-02-21 | 1997-08-23 | 1998-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-21 | 2001-08-23 | 2002-02-22 | $3760.00 | Window Closed / Lapsed |
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