US3918936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate lead trap
Assignee: PPG Industries Inc
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Filing: 1974-07-23
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Granted: 1975-11-11
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Expires: 1994-07-23
Abstract
Abstract An improved method for treating automotive exhaust gases is described which involves the utilization of an agglomerating device coupled to a specially constructed fiber glass filter in series in an automotive exhaust system. The filter employed involves the utilization of fiber glass needled mat preferably in the form of layers of mat held in place so that gases passing through the exhaust system must pass through the matted fibers in their passage through the device.
Inventors
- 👤 John G Holloway
- 👤 Herbert W Barch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:10
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/0218; F01N13/00; F01N13/009; F01N3/022; F01N3/0226; F01N3/033; F01N2330/00; F01N2330/10; F01N2330/101; F01N2330/102; F01N2370/00; F01N2370/22; F01N2450/00; F01N2450/30; F01N2470/00; F01N2470/10; G; G01; G01N; G01N21/00; G01N21/84; G01N21/85; G01N2021/8557; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/25; Y10S55/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
A METHOD OF TREATING AUTOMOTIVE EXHUST GASES TO REMOVE PARTICULATE LEAD THEREFROM COMPRISING: PASSING THE GASES FROM AN ENGINE AND CONTAINING LEAD PARTICULATES THROUGH AN AGGLOMERATION ZONE OPERATING AT A TEMPERATURE BETWEEN 700*F. AND 900*F. AND CONTAINING THEREIN A FIBER GLASS HAVING A RESIN BINDER TO BIND FIBERS WHICH IS CAPABLE OF WITHSTANDING TEMPERATURES OF 900*F., PASSING ALL OF THE GASES THROUGH SAID AGGLOMERATION ZONE AND SAID FIBER GLASS MAT, AGGLOMERATING LEAD PARTICULATES CONTAINED IN SAID GASES BY IMPINGING SAID LEAD PARTICULATES UPON EACH OTHER AND UPON SAID GLASS FIBER MAT, REMOVING THE GASES FROM SAID AGGLOMERATION ZONE, PROVIDING A FILTRATION ZONE FILLED WITH FIBER GLASS MAT HAVING A RESIN BINDER TO BIND FIBERS CAPABLE OF WITHSTANDING 500*F., PASSING THE GASES THROUGH SAID MAT FILTRATION ZONE AT A TEMPERATURE OF 500*F. OR LESS, REMOVING PARTICULATE LEAD BY FILTRATION IN SAID FILTRATION ZONE, AND REMOVING FROM SAID FILTRATION ZONE A GAS STREAM OF SUBSTANTIALLY REDUCED PARTICULATE LEAD CONTENT.
Claim 2
Independent Claim
157 words
A METHOD OF TREATING AUTOMOTIVE EXHUST GASES TO REMOVE PARTICULATE LEAD THEREFROM COMPRISING: PASSING THE GASES FROM AN ENGINE AND CONTAINING LEAD PARTICULATES THROUGH AN AGGLOMERATION ZONE OPERATING AT A TEMPERATURE BETWEEN 700*F. AND 900*F. AND CONTAINING THEREIN A FIBER GLASS HAVING A RESIN BINDER TO BIND FIBERS WHICH IS CAPABLE OF WITHSTANDING TEMPERATURES OF 900*F., PASSING ALL OF THE GASES THROUGH SAID AGGLOMERATION ZONE AND SAID FIBER GLASS MAT, AGGLOMERATING LEAD PARTICULATES CONTAINED IN SAID GASES BY IMPINGING SAID LEAD PARTICULATES UPON EACH OTHER AND UPON SAID GLASS FIBER MAT, REMOVING THE GASES FROM SAID AGGLOMERATION ZONE, PROVIDING A FILTRATION ZONE FILLED WITH FIBER GLASS MAT HAVING A RESIN BINDER TO BIND FIBERS CAPABLE OF WITHSTANDING 500*F., PASSING THE GASES THROUGH SAID MAT FILTRATION ZONE AT A TEMPERATURE OF 500*F. OR LESS, REMOVING PARTICULATE LEAD BY FILTRATION IN SAID FILTRATION ZONE, AND REMOVING FROM SAID FILTRATION ZONE A GAS STREAM OF SUBSTANTIALLY REDUCED PARTICULATE LEAD CONTENT.
Claim 3
Dependent Claim
18 words
A method of claim 1 wherein the fiber glass mat in the agglomeration zone is a needled mat.
Claim 4
Dependent Claim
18 words
A method of claim 1 wherein the fiber glass mat in the filtration zone is a needled mat.
Claim 5
Independent Claim
151 words
A method of treating automotive exhaust gases to remove particulates therefrom comprising: passing the gases from an engine and containing particulates through an agglomeration zone operating at a temperature between 700*F. and 900*F.; providing a fiber glass mat having a resin binder to bind fibers capable of withstanding 900*F. in said agglomeration zone; passing all of the gases through said agglomeration zone and said fiber glass mat; agglomerating particulates contained in said gases by impinging said particulates upon each other and upon said glass fiber mat; removing the gases from said agglomeration zone; providing a filtration zone filled with fiber glass mat having a resin binder to bind fibers capable of withstanding 500*F.; passing the gases through said filtration zone and said mat at a temperature of 500*F. or less; removing particulates filtration in said filtration zone; and removing from said filtration zone a gas stream of substantially reduced particulate content.
Claim 6
Independent Claim
151 words
A method of treating automotive exhaust gases to remove particulates therefrom comprising: passing the gases from an engine and containing particulates through an agglomeration zone operating at a temperature between 700*F. and 900*F.; providing a fiber glass mat having a resin binder to bind fibers capable of withstanding 900*F. in said agglomeration zone; passing all of the gases through said agglomeration zone and said fiber glass mat; agglomerating particulates contained in said gases by impinging said particulates upon each other and upon said glass fiber mat; removing the gases from said agglomeration zone; providing a filtration zone filled with fiber glass mat having a resin binder to bind fibers capable of withstanding 500*F.; passing the gases through said filtration zone and said mat at a temperature of 500*F. or less; removing particulates filtration in said filtration zone; and removing from said filtration zone a gas stream of substantially reduced particulate content.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |