Patent US4958490A successfully refreshed from Google Patents.
US4958490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing nitric oxide emissions in exhaust gases from diesel engines
Assignee: Outokumpu Oyj
•
Filing: 1989-08-14
•
Granted: 1990-09-25
•
Expires: 2009-08-14
Abstract
Abstract A method for reducing the nitric oxide emissions of the exhaust gases from a diesel engine by means of a controlled recirculation of the exhaust gases, which are cooled off and humidified in a water bath. The exhaust gases created in the diesel engine (1) are conducted into the wet cleaner (3), and part of the exhaust gases conducted into the wet cleaner (3) are returned to the suction duct (10) of the diesel engine, so that the amount of the recirculated exhaust gas is maintained constant with respect to the total exhaust gas volume.
Inventors
- 👤 Harri J. Harjunpaa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:58
CPC Classifications
F; F02; F02D; F02D21/00; F02D21/06; F02D21/08; F02M; F02M26/00; F02M26/13; F02M26/14; F02M26/15; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
A method for reducing the nitric oxide emissions of exhaust gases from a diesel engine by additions of water into an engine combustion chamber of said diesel engine and by recirculating exhaust gases, comprising conducting exhaust gases created in the engine into a wet cleaner for washing and cooling the gases, returning washed and cooled gases from the wet cleaner to a suction system of the engine, and maintaining constant the relationship by volume between a total gas volume of the engine and the volume of recirculated exhaust gases.
Claim 2
Independent Claim
89 words
A method for reducing the nitric oxide emissions of exhaust gases from a diesel engine by additions of water into an engine combustion chamber of said diesel engine and by recirculating exhaust gases, comprising conducting exhaust gases created in the engine into a wet cleaner for washing and cooling the gases, returning washed and cooled gases from the wet cleaner to a suction system of the engine, and maintaining constant the relationship by volume between a total gas volume of the engine and the volume of recirculated exhaust gases.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the recirculated exhaust gases contain the water additions.
Claim 4
Dependent Claim
23 words
The method of claim 1 or 2 wherein the amount of recirculated exhaust gases is about 20% of the total exhaust gas volume.
References Cited (Backward Citations)
US2737936A
Cited
US3139873A
Cited
US3615074A
Cited
US4075994A
Cited
US4340013A
Cited
US4181110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |