US3920428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element
Assignee: Ethyl Corp
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Filing: 1974-03-25
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Granted: 1975-11-18
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Expires: 1994-03-25
Abstract
Abstract A strong flexible filter element adapted to remove particulates from the exhaust gas of internal combustion engines comprising a non-woven mat of glass fibers fused with aromatic polyamide fibers, e.g., poly(m-phenylene isophthalamide) fibers.
Inventors
- 👤 Jr Homan B Kinsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:43
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/02; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; B01D39/20; B01D39/2003; B01D39/2017; B01D39/2024; Y; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
58 words
A FILTER ELEMENT OF HIGH STRENGTH AND GOOD FLEX USEFUL IN FILTRATION OF PARTICULATES FROM GAS AT ELEVATED TEMPERATURES, SAID FILTER ELEMENT COMPRISING A NON-WOVEN MAT OF GLASS FIBERS AND AROMATIC POLUAMIDE FIBERS, SAID AROMATIC POLYAMIDE FIBERS BEING FUSED TO SAID GLASS FIBERS, SAID AROMATIC POLYAMIDE FIBERS BEING A MIXTUE OF FIBERS AND SHORT FIBERS OF POLY(M-PHENYLENE ISOPHTHALAMIDE).
Claim 2
Dependent Claim
58 words
A FILTER ELEMENT OF HIGH STRENGTH AND GOOD FLEX USEFUL IN FILTRATION OF PARTICULATES FROM GAS AT ELEVATED TEMPERATURES, SAID FILTER ELEMENT COMPRISING A NON-WOVEN MAT OF GLASS FIBERS AND AROMATIC POLUAMIDE FIBERS, SAID AROMATIC POLYAMIDE FIBERS BEING FUSED TO SAID GLASS FIBERS, SAID AROMATIC POLYAMIDE FIBERS BEING A MIXTUE OF FIBERS AND SHORT FIBERS OF POLY(M-PHENYLENE ISOPHTHALAMIDE).
Claim 3
Dependent Claim
35 words
A filter element of claim 1 wherein said glass fiber is a glass micro fiber having a diameter of about 0.6-2 microns and said poly(m-phenylene isophthalamide) fiber is a mixture of fibrids and short fibers.
Claim 4
Dependent Claim
20 words
A filter element of claim 2 wherein from about 5-70 weight percent of said mat is said poly(m-phenylene isophthalamide) fiber.
Claim 5
Dependent Claim
19 words
A filter element of claim 3 wherein about 10-50 weight percent of said mat is said poly(m-phenylene isophthalamide) fiber.
Claim 6
Dependent Claim
33 words
A filter element of claim 1 wherein said glass fiber is a mixture of glass micro fibers having a diameter of 6-10 microns and glass micro fibers having a diameter of 1-3 microns.
Claim 7
Dependent Claim
31 words
A filter element of claim 5 wherein about 50-90 per cent of said glass fibers are said macro fibers and about 10-50 percent of said glass fibers are said micro fibers.
Claim 8
Dependent Claim
81 words
An exhaust system adapted to remove particulates from the exhaust gas of an internal combustion engine, said system comprising a filtration housing having an inlet and an outlet, said inlet being operatively connected to receive the exhaust gas from said internal combustion engine, a passage within said housing from said inlet to said outlet and a filter element of claim 1 completely across said passage whereby said exhaust gas passing from said inlet to said outlet passes through said filter element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |