US5787706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas purification device
Assignee: Volvo AB
•
Filing: 1994-12-22
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Granted: 1998-08-04
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Expires: 2014-12-22
Abstract
Abstract An exhaust gas purification device (10) for trapping combustion engine exhaust emissions, particularly hydrocarbons and particulate matter, is disclosed. The device includes a casing (12) having an inlet (14) for exhaust gases from a combustion engine. The casing (12) houses a filtering and/or adsorbing medium (16), whilst a catalytic converter (22) is arranged downstream of the medium (16). A valve arrangement is provided for controlling exhaust gas flow through the filtering and/or adsorbing medium (16). The casing further includes a throughflow passage (18) adjacent the filtering and/or adsorbing medium (16), the passage running from the upstream end to the downstream end of the filtering and/or adsorbing medium (16). The passage also includes a throttling valve (20) responsive to temperatures in the device.
Inventors
- 👤 Gudmund Smedler
- 👤 Staffan Lundgren
- 👤 Edward Jobson
- 👤 Bjorn Dexell
- 👤 Ove Backlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:32
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9481; F; F01; F01N; F01N13/00; F01N13/009; F01N13/0097; F01N3/00; F01N3/02; F01N3/021; F01N3/022; F01N3/0224; F01N3/08; F01N3/0807; F01N3/0821; F01N3/0828; F01N3/0835; F01N3/0871; F01N3/0878; F01N3/10; F01N3/24; F01N3/28; F01N3/2882; F01N2240/00; F01N2240/18; F01N2250/00; F01N2250/02; F01N2250/12; F01N2250/14; F01N2310/00; F01N2310/12; F01N2370/00; F01N2370/22; F01N2370/24; F01N2410/00; F01N2410/12; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
An exhaust gas purification device for trapping combustion engine exhaust emissions, said device comprising a casing having an inlet for exhaust gases from a combustion engine, said casing further comprising an outer coaxial tube and an inner coaxial tube defining an annular space therebetween, said annular space being filled with a filtering medium having an upstream end and a downstream end and said inner coaxial tube forming a throughflow passage running from said upstream end to said downstream end of said filtering medium, a downstream catalytic converter arranged downstream of said filtering medium, and a valve arrangement comprising a throttling valve associated with said throughflow passage, said throttling valve responsive to temperatures in said device for controlling the flow through said filtering medium.
Claim 2
Dependent Claim
123 words
An exhaust gas purification device for trapping combustion engine exhaust emissions, said device comprising a casing having an inlet for exhaust gases from a combustion engine, said casing further comprising an outer coaxial tube and an inner coaxial tube defining an annular space therebetween, said annular space being filled with a filtering medium having an upstream end and a downstream end and said inner coaxial tube forming a throughflow passage running from said upstream end to said downstream end of said filtering medium, a downstream catalytic converter arranged downstream of said filtering medium, and a valve arrangement comprising a throttling valve associated with said throughflow passage, said throttling valve responsive to temperatures in said device for controlling the flow through said filtering medium.
Claim 3
Dependent Claim
24 words
The exhaust gas purification device as claimed in claim 1, wherein said throttling valve is responsive to the temperature of said downstream catalytic converter.
Claim 4
Dependent Claim
40 words
The exhaust gas purification device as claimed in claim 1, wherein when the temperature of said downstream catalytic converter is below a predetermined value, said throttling valve is closed so that the exhaust gas flow passes through said filtering medium.
Claim 5
Dependent Claim
44 words
The exhaust gas purification device as claimed in claim 1, wherein when the temperature of said downstream catalytic converter is above a predetermined value, said throttling valve is set to allow a majority of the exhaust gas flow to pass through said throughflow passage.
Claim 6
Dependent Claim
20 words
The exhaust gas purification device as claimed in claim 1, including an upstream catalytic converter upstream of said filtering medium.
Claim 7
Dependent Claim
22 words
The exhaust gas purification device as claimed in claim 5, wherein said upstream catalytic converter is smaller than said downstream catalytic converter.
Claim 8
Dependent Claim
20 words
The exhaust gas purification device as claimed in claim 6, wherein said downstream catalytic converter is housed within said casing.
Claim 9
Dependent Claim
35 words
The exhaust gas purification device as claimed in any one of claims 5 to 4, wherein the exhaust gas flow passes through both said downstream catalytic converter and said upstream catalytic converter at all times.
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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) | 2001-08-03 | 2002-02-02 | 2002-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-03 | 2006-02-02 | 2006-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-03 | 2010-02-02 | 2010-08-04 | $7700.00 | Window Closed / Lapsed |