US3826067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter
Assignee: Ethyl Corp
•
Filing: 1972-04-05
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Granted: 1974-07-30
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Expires: 1992-04-05
Abstract
Abstract Described herein is a porous filter mat comprising glass fibers and a quaternary ammonium silicate binder. Optionally, the mat contains asbestos or micro-glass fibers which reduce the porosity of the mat to the level required for the particular filtration. Filter elements made from the mat have good structural integrity even at high temperatures. The filter mat is used to remove particulates from the exhaust of an internal combustion engine.
Inventors
- 👤 H Wilder
- 👤 H Kinsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:43
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D39/00; B01D39/14; B01D39/20; B01D39/2003; B01D39/2017; B01D39/2024; B01D39/2068; B01D39/2082; B01D39/2089; B01D46/24; B01D46/2403; B01D50/00; B01D50/20; F; F01; F01N; F01N13/00; F01N13/009; F01N3/00; F01N3/02; F01N3/021; F01N3/0217; F01N3/022; F01N3/0226; F01N3/033; F01N3/037; B01D2273/00; B01D2273/20; B01D2279/00; B01D2279/30; F01N2230/00; F01N2230/02; F01N2250/00; F01N2250/08; F01N2330/00; F01N2330/10; F01N2330/101; F01N2330/102; F01N2370/00; F01N2370/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
17 words
A filter element of claim 1 wherein said glass fibers are randomly entangled to form said mat.
Claim 2
Dependent Claim
20 words
A filter element of claim 2 wherein a major amount of said glass fibers are at least one-half inch long.
Claim 3
Dependent Claim
21 words
A filter element of claim 3 containing a porosityreducing amount of a fine fiber selected from asbestos fiber and micro-glass fiber.
Claim 4
Dependent Claim
30 words
A filter element of claim 4 wherein said fine fiber is concentrated near one surface of said mat and gradually decreases in concentration towards the other surface of said mat.
Claim 5
Dependent Claim
12 words
A mat of claim 5 wherein said fine fiber is asbestos fiber.
Claim 6
Dependent Claim
12 words
A mat of claim 5 wherein said fine fiber is microglass fiber.
Claim 7
Dependent Claim
33 words
A filter element of claim 3 wherein up to about 10 weight per cent of the glass fibers forming said mat are in the form of bundles containing a plurality of glass fibers.
Claim 8
Dependent Claim
21 words
A filter element of claim 8 containing a porosityreducing amount of a fine fiber selected from asbestos fiber and micro-glass fiber.
Claim 9
Dependent Claim
110 words
In an exhaust system fOr an internal combustion engine, said system comprising an exhaust conduit for conducting the exhaust gas from said engine to an exhaust location, the improvement wherein said exhaust conduit includes a filter, said filter comprising a housing having an exhaust gas inlet and outlet, said housing defining an exhaust flow path from said inlet to said outlet, and a filter element within said housing disposed across said flow path such that all of said exhaust gas passing through said housing passes through said filter element, said filter element comprising a porous mat of glass fibers bonded together throughout said mat with a quaternary ammonium silicate binder.
Claim 10
Dependent Claim
17 words
An exhaust system of claim 10 wherein said glass fibers are randomly entangled to form said mat.
Claim 11
Dependent Claim
16 words
An exhaust system of claim 11 wherein said mat contains a porosity-reducing amount of micro-glass fiber.
Claim 12
Dependent Claim
16 words
An exhaust system of claim 11 wherein said mat contains a porosity-reducing amount of asbestos fiber.
Claim 13
Dependent Claim
40 words
An exhaust system of claim 13 wherein said asbestos fiber is concentrated near one surface of said mat and gradually decreases in concentration towards the other surface of said mat, said other surface of said mat being nearest said engine.
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |