US5234477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing NOx emissions in gasoline vehicles
Assignee: Shell USA Inc
•
Filing: 1992-04-28
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Granted: 1993-08-10
•
Expires: 2012-04-28
Abstract
Abstract The present invention is an unleaded fuel composition containing a major amount of a hydrocarbon base fuel of the gasoline boiling range containing an amount effective to reduce NO x emissions from electronic port fuel injected engines of ammonia or an ammonium compound. The invention also includes a method of reducing NO x emissions from electronic port fuel injected engines by feeding to the engine exhaust gases at a point between the outlet valves and catalytic converter an amount effective to reduce NO x emissions from the engines of ammonia or an ammonium compound.
Inventors
- 👤 John E. Gwyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:12
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/188; C10L1/1881; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; C10L1/12; C10L1/1266; C10L1/1883; C10L1/22; C10L1/222; C10L1/2222; C10L10/00; C10L10/02; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/206; F01N2610/00; F01N2610/02; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
58 words
An unleaded fuel composition comprising a major amount of a hydrocarbon base fuel of the gasoline boiling range containing an amount effective to reduce NO x emissions from electronic port fuel injected engines of an ammonium compound selected from the group consisting of ammonium formate, ammonium propionate, ammonium dicitrate, ammonium carbamate, ammonium carbonate, ammonium accetate, and admixtures thereof.
Claim 2
Dependent Claim
58 words
An unleaded fuel composition comprising a major amount of a hydrocarbon base fuel of the gasoline boiling range containing an amount effective to reduce NO x emissions from electronic port fuel injected engines of an ammonium compound selected from the group consisting of ammonium formate, ammonium propionate, ammonium dicitrate, ammonium carbamate, ammonium carbonate, ammonium accetate, and admixtures thereof.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein the ammonium compound is ammonium formate.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein the ammonium compound is ammonium propionate.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein the ammonium compound is ammonium dicitrate.
Claim 6
Dependent Claim
12 words
The composiition of claim 1 wherein the ammonium compound is ammonium carbamate.
Claim 7
Dependent Claim
12 words
The compositiion of claim 1 wherein the ammonium compound is ammonium carbonate.
Claim 8
Dependent Claim
12 words
The composition of claim 1 wherein the ammonium compound is ammonium acetate.
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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) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |