US4441971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for reducing soot
Assignee: Toyota Central R&D Labs Inc
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Filing: 1982-12-23
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Granted: 1984-04-10
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Expires: 2002-12-23
Abstract
Abstract The process and apparatus for reducing soot in soot-containing gases, such as exhaust gases from a Diesel engine, by applying thereto an alternating or pulsating voltage to promote oxidation of soot and to change the character of soot. The resultant gas may be contacted with active medium, such as a heated net of metal or an oxidation catalyst, to oxidize the remaining soot.
Inventors
- 👤 Tomoji Ishiguro
- 👤 Yoshimi Kizaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:27
CPC Classifications
B; B01; B01D; B01D49/00; F; F01; F01N; F01N3/00; F01N3/01; F01N3/02; F01N3/021; F01N3/022; F01N3/023; F01N3/0231; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2013; F01N3/202; F01N3/24; F01N3/26; F01N3/28; F01N3/2803; F01N3/2807; F01N3/2832; F01N3/2839; F01N3/2846; F01N3/2882; F01N2240/00; F01N2240/04; F01N2330/00; F01N2330/08; F01N2330/10; F01N2330/101; F01N2330/102; F01N2330/12; F02; F02B; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
A process for reducing soot in exhaust gases from an automobile Diesel engine which comprises: introducing soot-containing exhaust gases from an automobile Diesel engine into a container; applying to said soot-containing exhaust gases an alternating or pulsating voltage in the range of from 100 v/cm to 10,000 v/cm and having a frequency in the range of from 10 Hz to 250 Hz to break masses of soot particles, each mass having a diameter of at least 0.2 micron, into individual finer particles, each having a diameter not greater than several hundred angstroms; and discharging said gases out of said container.
Claim 2
Dependent Claim
100 words
A process for reducing soot in exhaust gases from an automobile Diesel engine which comprises: introducing soot-containing exhaust gases from an automobile Diesel engine into a container; applying to said soot-containing exhaust gases an alternating or pulsating voltage in the range of from 100 v/cm to 10,000 v/cm and having a frequency in the range of from 10 Hz to 250 Hz to break masses of soot particles, each mass having a diameter of at least 0.2 micron, into individual finer particles, each having a diameter not greater than several hundred angstroms; and discharging said gases out of said container.
Claim 3
Dependent Claim
20 words
A process according to claim 1, which further comprises contacting said gases with an active medium, thereby oxidizing the soot.
Claim 4
Dependent Claim
22 words
A process according to claim 2, wherein said active medium is at least one of a heated article and an oxidation catalyst.
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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |