US5505757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion-resistant metal filters
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1994-08-18
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Granted: 1996-04-09
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Expires: 2014-08-18
Abstract
Abstract Metal filter for a particulate trap which meets the requirements for low pressure drop, high collecting capacity and a long life. The metal filters have one or more layers of unwoven fabric (such as felt) formed of a metal fiber having one of the following alloy compositions A, B and C wherein composition A is made of Ni: 5-20% by weight, Cr: 10-40 by weight, Al: 1-15% by weight, the remainder being Fe and inevitable impurities; composition B is made of Cr: 10-40% by weight, Al: 1-15% by weight, the remainder being Ni and inevitable impurities; and composition C is made of Cr: 10-40% by weight, Al: 1-15% by weight, the remainder being Fe and inevitable components. The metal filter is highly resistant to corrosion and heat and can withstand repeated heatings for removal of the particulate.
Inventors
- 👤 Masayuki Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:40
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2051; B01D39/2041; B01D46/00; B01D46/24; F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; B01D2239/00; B01D2239/06; B01D2239/0604; B01D2239/0618; B01D2239/12; B01D2239/1233; Y; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A corrosion-resistant metal filter comprising a member selected from the group consisting of a single layer and a plurality of layers of nonwoven fabric formed of metal fiber selected from the group consisting of alloy compositions A, B and C, wherein composition A comprises Ni: 5-20% by weight, Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the composition, the remainder being Fe and inevitable impurities; composition B comprises Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the composition, the remainder being Ni and inevitable impurities; and composition C comprises Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the compositions, the remainder being Fe and inevitable impurities.
Claim 2
Dependent Claim
124 words
A corrosion-resistant metal filter comprising a member selected from the group consisting of a single layer and a plurality of layers of nonwoven fabric formed of metal fiber selected from the group consisting of alloy compositions A, B and C, wherein composition A comprises Ni: 5-20% by weight, Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the composition, the remainder being Fe and inevitable impurities; composition B comprises Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the composition, the remainder being Ni and inevitable impurities; and composition C comprises Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the compositions, the remainder being Fe and inevitable impurities.
Claim 3
Dependent Claim
36 words
A corrosion-resistant metal filter as claimed in claim 1 wherein said nonwoven fabric is formed by aggregating metal fibers having an average diameter from 5 to 40 μm so that a packing percentage will be 5-25%.
Claim 4
Dependent Claim
42 words
A corrosion-resistant metal filter as claimed in claim 1 or 2 wherein said metal fiber is a member selected from the group consisting of a hollow fiber and a fiber having a core made of a material different from a surrounding material.
Claim 5
Dependent Claim
140 words
A corrosion-resistant metal filter comprising a heat-resistant foamed metal having numerous pores that communicate with one another, and a metal fiber having a diameter of from 5 to 40 μm and filling said pore at a packing rate of 5-25%, said metal fiber being selected from the group consisting of alloy compositions A, B and C, wherein composition A comprises Ni: 5-20% by weight, Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the composition, the remainder being Fe and inevitable impurities; composition B comprises Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the composition, the remainder being Ni and inevitable impurities; and composition C comprises Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the compositions, the remainder being Fe and inevitable impurities.
Claim 6
Dependent Claim
140 words
A corrosion-resistant metal filter comprising a heat-resistant foamed metal having numerous pores that communicate with one another, and a metal fiber having a diameter of from 5 to 40 μm and filling said pore at a packing rate of 5-25%, said metal fiber being selected from the group consisting of alloy compositions A, B and C, wherein composition A comprises Ni: 5-20% by weight, Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the composition, the remainder being Fe and inevitable impurities; composition B comprises Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the composition, the remainder being Ni and inevitable impurities; and composition C comprises Cr: 10-40% by weight, Al: 1-15% by weight, based on the total weight of the compositions, the remainder being Fe and inevitable impurities.
Claim 7
Dependent Claim
40 words
A corrosion-resistant metal filter as claimed in claim 2 wherein said metal fiber is a member selected from the group consisting of a hollow fiber or a fiber having a core made of a material different from a surrounding material.
Claim 8
Dependent Claim
30 words
A corrosion-resistant metal filter as claimed in claims 1 or 4 wherein the concentration Al in compositions A, B. and C is higher near a surface of the metal fiber.
Claim 9
Dependent Claim
16 words
A corrosion-resistant metal fiber according to claim 5 wherein said metal fiber is a hollow fiber.
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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) | 1999-04-09 | 1999-10-09 | 2000-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-09 | 2003-10-09 | 2004-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-09 | 2007-10-09 | 2008-04-09 | $7700.00 | Window Closed / Lapsed |